[Summary view] [Print] [Text view]

   1  <?php
   2  /**
   3   * WordPress Plugin Administration API: WP_Plugin_Dependencies class
   4   *
   5   * @package WordPress
   6   * @subpackage Administration
   7   * @since 6.5.0
   8   */
   9  
  10  /**
  11   * Core class for installing plugin dependencies.
  12   *
  13   * It is designed to add plugin dependencies as designated in the
  14   * `Requires Plugins` header to a new view in the plugins install page.
  15   */
  16  class WP_Plugin_Dependencies {
  17  
  18      /**
  19       * Holds 'get_plugins()'.
  20       *
  21       * @since 6.5.0
  22       *
  23       * @var array
  24       */
  25      protected static $plugins;
  26  
  27      /**
  28       * Holds plugin directory names to compare with cache.
  29       *
  30       * @since 6.5.0
  31       *
  32       * @var array
  33       */
  34      protected static $plugin_dirnames;
  35  
  36      /**
  37       * Holds sanitized plugin dependency slugs.
  38       *
  39       * Keyed on the dependent plugin's filepath,
  40       * relative to the plugins directory.
  41       *
  42       * @since 6.5.0
  43       *
  44       * @var array
  45       */
  46      protected static $dependencies;
  47  
  48      /**
  49       * Holds an array of sanitized plugin dependency slugs.
  50       *
  51       * @since 6.5.0
  52       *
  53       * @var array
  54       */
  55      protected static $dependency_slugs;
  56  
  57      /**
  58       * Holds an array of dependent plugin slugs.
  59       *
  60       * Keyed on the dependent plugin's filepath,
  61       * relative to the plugins directory.
  62       *
  63       * @since 6.5.0
  64       *
  65       * @var array
  66       */
  67      protected static $dependent_slugs;
  68  
  69      /**
  70       * Holds 'plugins_api()' data for plugin dependencies.
  71       *
  72       * @since 6.5.0
  73       *
  74       * @var array
  75       */
  76      protected static $dependency_api_data;
  77  
  78      /**
  79       * Holds plugin dependency filepaths, relative to the plugins directory.
  80       *
  81       * Keyed on the dependency's slug.
  82       *
  83       * @since 6.5.0
  84       *
  85       * @var string[]
  86       */
  87      protected static $dependency_filepaths;
  88  
  89      /**
  90       * An array of circular dependency pairings.
  91       *
  92       * @since 6.5.0
  93       *
  94       * @var array[]
  95       */
  96      protected static $circular_dependencies_pairs;
  97  
  98      /**
  99       * An array of circular dependency slugs.
 100       *
 101       * @since 6.5.0
 102       *
 103       * @var string[]
 104       */
 105      protected static $circular_dependencies_slugs;
 106  
 107      /**
 108       * Whether Plugin Dependencies have been initialized.
 109       *
 110       * @since 6.5.0
 111       *
 112       * @var bool
 113       */
 114      protected static $initialized = false;
 115  
 116      /**
 117       * Initializes by fetching plugin header and plugin API data.
 118       *
 119       * @since 6.5.0
 120       */
 121  	public static function initialize() {
 122          if ( false === self::$initialized ) {
 123              self::read_dependencies_from_plugin_headers();
 124              self::get_dependency_api_data();
 125              self::$initialized = true;
 126          }
 127      }
 128  
 129      /**
 130       * Determines whether the plugin has plugins that depend on it.
 131       *
 132       * @since 6.5.0
 133       *
 134       * @param string $plugin_file The plugin's filepath, relative to the plugins directory.
 135       * @return bool Whether the plugin has plugins that depend on it.
 136       */
 137  	public static function has_dependents( $plugin_file ) {
 138          return in_array( self::convert_to_slug( $plugin_file ), (array) self::$dependency_slugs, true );
 139      }
 140  
 141      /**
 142       * Determines whether the plugin has plugin dependencies.
 143       *
 144       * @since 6.5.0
 145       *
 146       * @param string $plugin_file The plugin's filepath, relative to the plugins directory.
 147       * @return bool Whether a plugin has plugin dependencies.
 148       */
 149  	public static function has_dependencies( $plugin_file ) {
 150          return isset( self::$dependencies[ $plugin_file ] );
 151      }
 152  
 153      /**
 154       * Determines whether the plugin has active dependents.
 155       *
 156       * @since 6.5.0
 157       *
 158       * @param string $plugin_file The plugin's filepath, relative to the plugins directory.
 159       * @return bool Whether the plugin has active dependents.
 160       */
 161  	public static function has_active_dependents( $plugin_file ) {
 162          require_once  ABSPATH . 'wp-admin/includes/plugin.php';
 163  
 164          $dependents = self::get_dependents( self::convert_to_slug( $plugin_file ) );
 165          foreach ( $dependents as $dependent ) {
 166              if ( is_plugin_active( $dependent ) ) {
 167                  return true;
 168              }
 169          }
 170  
 171          return false;
 172      }
 173  
 174      /**
 175       * Gets filepaths of plugins that require the dependency.
 176       *
 177       * @since 6.5.0
 178       *
 179       * @param string $slug The dependency's slug.
 180       * @return array An array of dependent plugin filepaths, relative to the plugins directory.
 181       */
 182  	public static function get_dependents( $slug ) {
 183          $dependents = array();
 184  
 185          foreach ( (array) self::$dependencies as $dependent => $dependencies ) {
 186              if ( in_array( $slug, $dependencies, true ) ) {
 187                  $dependents[] = $dependent;
 188              }
 189          }
 190  
 191          return $dependents;
 192      }
 193  
 194      /**
 195       * Gets the slugs of plugins that the dependent requires.
 196       *
 197       * @since 6.5.0
 198       *
 199       * @param string $plugin_file The dependent plugin's filepath, relative to the plugins directory.
 200       * @return array An array of dependency plugin slugs.
 201       */
 202  	public static function get_dependencies( $plugin_file ) {
 203          return self::$dependencies[ $plugin_file ] ?? array();
 204      }
 205  
 206      /**
 207       * Gets a dependent plugin's filepath.
 208       *
 209       * @since 6.5.0
 210       *
 211       * @param string $slug  The dependent plugin's slug.
 212       * @return string|false The dependent plugin's filepath, relative to the plugins directory,
 213       *                      or false if the plugin has no dependencies.
 214       */
 215  	public static function get_dependent_filepath( $slug ) {
 216          $filepath = array_search( $slug, self::$dependent_slugs, true );
 217  
 218          return $filepath ? $filepath : false;
 219      }
 220  
 221      /**
 222       * Determines whether the plugin has unmet dependencies.
 223       *
 224       * @since 6.5.0
 225       *
 226       * @param string $plugin_file The plugin's filepath, relative to the plugins directory.
 227       * @return bool Whether the plugin has unmet dependencies.
 228       */
 229  	public static function has_unmet_dependencies( $plugin_file ) {
 230          if ( ! isset( self::$dependencies[ $plugin_file ] ) ) {
 231              return false;
 232          }
 233  
 234          require_once  ABSPATH . 'wp-admin/includes/plugin.php';
 235  
 236          foreach ( self::$dependencies[ $plugin_file ] as $dependency ) {
 237              $dependency_filepath = self::get_dependency_filepath( $dependency );
 238  
 239              if ( false === $dependency_filepath || is_plugin_inactive( $dependency_filepath ) ) {
 240                  return true;
 241              }
 242          }
 243  
 244          return false;
 245      }
 246  
 247      /**
 248       * Determines whether the plugin has a circular dependency.
 249       *
 250       * @since 6.5.0
 251       *
 252       * @param string $plugin_file The plugin's filepath, relative to the plugins directory.
 253       * @return bool Whether the plugin has a circular dependency.
 254       */
 255  	public static function has_circular_dependency( $plugin_file ) {
 256          if ( ! is_array( self::$circular_dependencies_slugs ) ) {
 257              self::get_circular_dependencies();
 258          }
 259  
 260          if ( ! empty( self::$circular_dependencies_slugs ) ) {
 261              $slug = self::convert_to_slug( $plugin_file );
 262  
 263              if ( in_array( $slug, self::$circular_dependencies_slugs, true ) ) {
 264                  return true;
 265              }
 266          }
 267  
 268          return false;
 269      }
 270  
 271      /**
 272       * Gets the names of plugins that require the plugin.
 273       *
 274       * @since 6.5.0
 275       *
 276       * @param string $plugin_file The plugin's filepath, relative to the plugins directory.
 277       * @return array An array of dependent names.
 278       */
 279  	public static function get_dependent_names( $plugin_file ) {
 280          $dependent_names = array();
 281          $plugins         = self::get_plugins();
 282          $slug            = self::convert_to_slug( $plugin_file );
 283  
 284          foreach ( self::get_dependents( $slug ) as $dependent ) {
 285              $dependent_names[ $dependent ] = $plugins[ $dependent ]['Name'];
 286          }
 287          sort( $dependent_names );
 288  
 289          return $dependent_names;
 290      }
 291  
 292      /**
 293       * Gets the names of plugins required by the plugin.
 294       *
 295       * @since 6.5.0
 296       *
 297       * @param string $plugin_file The dependent plugin's filepath, relative to the plugins directory.
 298       * @return array An array of dependency names.
 299       */
 300  	public static function get_dependency_names( $plugin_file ) {
 301          $dependency_api_data = self::get_dependency_api_data();
 302          $dependencies        = self::get_dependencies( $plugin_file );
 303          $plugins             = self::get_plugins();
 304  
 305          $dependency_names = array();
 306          foreach ( $dependencies as $dependency ) {
 307              // Use the name if it's available, otherwise fall back to the slug.
 308              if ( isset( $dependency_api_data[ $dependency ]['name'] ) ) {
 309                  $name = $dependency_api_data[ $dependency ]['name'];
 310              } else {
 311                  $dependency_filepath = self::get_dependency_filepath( $dependency );
 312                  if ( false !== $dependency_filepath ) {
 313                      $name = $plugins[ $dependency_filepath ]['Name'];
 314                  } else {
 315                      $name = $dependency;
 316                  }
 317              }
 318  
 319              $dependency_names[ $dependency ] = $name;
 320          }
 321  
 322          return $dependency_names;
 323      }
 324  
 325      /**
 326       * Gets the filepath for a dependency, relative to the plugin's directory.
 327       *
 328       * @since 6.5.0
 329       *
 330       * @param string $slug The dependency's slug.
 331       * @return string|false If installed, the dependency's filepath relative to the plugins directory, otherwise false.
 332       */
 333  	public static function get_dependency_filepath( $slug ) {
 334          $dependency_filepaths = self::get_dependency_filepaths();
 335  
 336          if ( ! isset( $dependency_filepaths[ $slug ] ) ) {
 337              return false;
 338          }
 339  
 340          return $dependency_filepaths[ $slug ];
 341      }
 342  
 343      /**
 344       * Returns API data for the dependency.
 345       *
 346       * @since 6.5.0
 347       *
 348       * @param string $slug The dependency's slug.
 349       * @return array|false The dependency's API data on success, otherwise false.
 350       */
 351  	public static function get_dependency_data( $slug ) {
 352          $dependency_api_data = self::get_dependency_api_data();
 353          return $dependency_api_data[ $slug ] ?? false;
 354      }
 355  
 356      /**
 357       * Displays an admin notice if dependencies are not installed.
 358       *
 359       * @since 6.5.0
 360       */
 361  	public static function display_admin_notice_for_unmet_dependencies() {
 362          if ( in_array( false, self::get_dependency_filepaths(), true ) ) {
 363              $error_message = __( 'Some required plugins are missing or inactive.' );
 364  
 365              if ( is_multisite() ) {
 366                  if ( current_user_can( 'manage_network_plugins' ) ) {
 367                      $error_message .= ' ' . sprintf(
 368                          /* translators: %s: Link to the network plugins page. */
 369                          __( '<a href="%s">Manage plugins</a>.' ),
 370                          esc_url( network_admin_url( 'plugins.php' ) )
 371                      );
 372                  } else {
 373                      $error_message .= ' ' . __( 'Please contact your network administrator.' );
 374                  }
 375              } elseif ( 'plugins' !== get_current_screen()->base ) {
 376                  $error_message .= ' ' . sprintf(
 377                      /* translators: %s: Link to the plugins page. */
 378                      __( '<a href="%s">Manage plugins</a>.' ),
 379                      esc_url( admin_url( 'plugins.php' ) )
 380                  );
 381              }
 382  
 383              wp_admin_notice(
 384                  $error_message,
 385                  array(
 386                      'type' => 'warning',
 387                  )
 388              );
 389          }
 390      }
 391  
 392      /**
 393       * Displays an admin notice if circular dependencies are installed.
 394       *
 395       * @since 6.5.0
 396       */
 397      public static function display_admin_notice_for_circular_dependencies() {
 398          $circular_dependencies = self::get_circular_dependencies();
 399          if ( ! empty( $circular_dependencies ) && count( $circular_dependencies ) > 1 ) {
 400              $circular_dependencies = array_unique( $circular_dependencies, SORT_REGULAR );
 401              $plugins               = self::get_plugins();
 402              $plugin_dirnames       = self::get_plugin_dirnames();
 403  
 404              // Build output lines.
 405              $circular_dependency_lines = '';
 406              foreach ( $circular_dependencies as $circular_dependency ) {
 407                  $first_filepath             = $plugin_dirnames[ $circular_dependency[0] ];
 408                  $second_filepath            = $plugin_dirnames[ $circular_dependency[1] ];
 409                  $circular_dependency_lines .= sprintf(
 410                      /* translators: 1: First plugin name, 2: Second plugin name. */
 411                      '<li>' . _x( '%1$s requires %2$s', 'The first plugin requires the second plugin.' ) . '</li>',
 412                      '<strong>' . esc_html( $plugins[ $first_filepath ]['Name'] ) . '</strong>',
 413                      '<strong>' . esc_html( $plugins[ $second_filepath ]['Name'] ) . '</strong>'
 414                  );
 415              }
 416  
 417              wp_admin_notice(
 418                  sprintf(
 419                      '<p>%1$s</p><ul>%2$s</ul><p>%3$s</p>',
 420                      __( 'These plugins cannot be activated because their requirements are invalid.' ),
 421                      $circular_dependency_lines,
 422                      __( 'Please contact the plugin authors for more information.' )
 423                  ),
 424                  array(
 425                      'type'           => 'warning',
 426                      'paragraph_wrap' => false,
 427                  )
 428              );
 429          }
 430      }
 431  
 432      /**
 433       * Checks plugin dependencies after a plugin is installed via AJAX.
 434       *
 435       * @since 6.5.0
 436       */
 437  	public static function check_plugin_dependencies_during_ajax() {
 438          check_ajax_referer( 'updates' );
 439  
 440          if ( empty( $_POST['slug'] ) ) {
 441              wp_send_json_error(
 442                  array(
 443                      'slug'         => '',
 444                      'pluginName'   => '',
 445                      'errorCode'    => 'no_plugin_specified',
 446                      'errorMessage' => __( 'No plugin specified.' ),
 447                  )
 448              );
 449          }
 450  
 451          $slug   = sanitize_key( wp_unslash( $_POST['slug'] ) );
 452          $status = array( 'slug' => $slug );
 453  
 454          self::get_plugins();
 455          self::get_plugin_dirnames();
 456  
 457          if ( ! isset( self::$plugin_dirnames[ $slug ] ) ) {
 458              $status['errorCode']    = 'plugin_not_installed';
 459              $status['errorMessage'] = __( 'The plugin is not installed.' );
 460              wp_send_json_error( $status );
 461          }
 462  
 463          $plugin_file          = self::$plugin_dirnames[ $slug ];
 464          $status['pluginName'] = self::$plugins[ $plugin_file ]['Name'];
 465          $status['plugin']     = $plugin_file;
 466  
 467          if ( current_user_can( 'activate_plugin', $plugin_file ) && is_plugin_inactive( $plugin_file ) ) {
 468              $status['activateUrl'] = add_query_arg(
 469                  array(
 470                      '_wpnonce' => wp_create_nonce( 'activate-plugin_' . $plugin_file ),
 471                      'action'   => 'activate',
 472                      'plugin'   => $plugin_file,
 473                  ),
 474                  is_multisite() ? network_admin_url( 'plugins.php' ) : admin_url( 'plugins.php' )
 475              );
 476          }
 477  
 478          if ( is_multisite() && current_user_can( 'manage_network_plugins' ) ) {
 479              $status['activateUrl'] = add_query_arg( array( 'networkwide' => 1 ), $status['activateUrl'] );
 480          }
 481  
 482          self::initialize();
 483          $dependencies = self::get_dependencies( $plugin_file );
 484          if ( empty( $dependencies ) ) {
 485              $status['message'] = __( 'The plugin has no required plugins.' );
 486              wp_send_json_success( $status );
 487          }
 488  
 489          require_once  ABSPATH . 'wp-admin/includes/plugin.php';
 490  
 491          $inactive_dependencies = array();
 492          foreach ( $dependencies as $dependency ) {
 493              if ( false === self::$plugin_dirnames[ $dependency ] || is_plugin_inactive( self::$plugin_dirnames[ $dependency ] ) ) {
 494                  $inactive_dependencies[] = $dependency;
 495              }
 496          }
 497  
 498          if ( ! empty( $inactive_dependencies ) ) {
 499              $inactive_dependency_names = array_map(
 500                  function ( $dependency ) {
 501                      if ( isset( self::$dependency_api_data[ $dependency ]['Name'] ) ) {
 502                          $inactive_dependency_name = self::$dependency_api_data[ $dependency ]['Name'];
 503                      } else {
 504                          $inactive_dependency_name = $dependency;
 505                      }
 506                      return $inactive_dependency_name;
 507                  },
 508                  $inactive_dependencies
 509              );
 510  
 511              $status['errorCode']    = 'inactive_dependencies';
 512              $status['errorMessage'] = sprintf(
 513                  /* translators: %s: A list of inactive dependency plugin names. */
 514                  __( 'The following plugins must be activated first: %s.' ),
 515                  implode( ', ', $inactive_dependency_names )
 516              );
 517              $status['errorData'] = array_combine( $inactive_dependencies, $inactive_dependency_names );
 518  
 519              wp_send_json_error( $status );
 520          }
 521  
 522          $status['message'] = __( 'All required plugins are installed and activated.' );
 523          wp_send_json_success( $status );
 524      }
 525  
 526      /**
 527       * Gets data for installed plugins.
 528       *
 529       * @since 6.5.0
 530       *
 531       * @return array An array of plugin data.
 532       */
 533  	protected static function get_plugins() {
 534          if ( is_array( self::$plugins ) ) {
 535              return self::$plugins;
 536          }
 537  
 538          require_once  ABSPATH . 'wp-admin/includes/plugin.php';
 539          self::$plugins = get_plugins();
 540  
 541          return self::$plugins;
 542      }
 543  
 544      /**
 545       * Reads and stores dependency slugs from a plugin's 'Requires Plugins' header.
 546       *
 547       * @since 6.5.0
 548       */
 549  	protected static function read_dependencies_from_plugin_headers() {
 550          self::$dependencies     = array();
 551          self::$dependency_slugs = array();
 552          self::$dependent_slugs  = array();
 553          $plugins                = self::get_plugins();
 554          foreach ( $plugins as $plugin => $header ) {
 555              if ( '' === $header['RequiresPlugins'] ) {
 556                  continue;
 557              }
 558  
 559              $dependency_slugs              = self::sanitize_dependency_slugs( $header['RequiresPlugins'] );
 560              self::$dependencies[ $plugin ] = $dependency_slugs;
 561              self::$dependency_slugs        = array_merge( self::$dependency_slugs, $dependency_slugs );
 562  
 563              $dependent_slug                   = self::convert_to_slug( $plugin );
 564              self::$dependent_slugs[ $plugin ] = $dependent_slug;
 565          }
 566          self::$dependency_slugs = array_unique( self::$dependency_slugs );
 567      }
 568  
 569      /**
 570       * Sanitizes slugs.
 571       *
 572       * @since 6.5.0
 573       *
 574       * @param string $slugs A comma-separated string of plugin dependency slugs.
 575       * @return array An array of sanitized plugin dependency slugs.
 576       */
 577  	protected static function sanitize_dependency_slugs( $slugs ) {
 578          $sanitized_slugs = array();
 579          $slugs           = explode( ',', $slugs );
 580  
 581          foreach ( $slugs as $slug ) {
 582              $slug = trim( $slug );
 583  
 584              /**
 585               * Filters a plugin dependency's slug before matching to
 586               * the WordPress.org slug format.
 587               *
 588               * Can be used to switch between free and premium plugin slugs, for example.
 589               *
 590               * @since 6.5.0
 591               *
 592               * @param string $slug The slug.
 593               */
 594              $slug = apply_filters( 'wp_plugin_dependencies_slug', $slug );
 595  
 596              // Match to WordPress.org slug format.
 597              if ( preg_match( '/^[a-z0-9]+(-[a-z0-9]+)*$/mu', $slug ) ) {
 598                  $sanitized_slugs[] = $slug;
 599              }
 600          }
 601          $sanitized_slugs = array_unique( $sanitized_slugs );
 602          sort( $sanitized_slugs );
 603  
 604          return $sanitized_slugs;
 605      }
 606  
 607      /**
 608       * Gets the filepath of installed dependencies.
 609       * If a dependency is not installed, the filepath defaults to false.
 610       *
 611       * @since 6.5.0
 612       *
 613       * @return array An array of install dependencies filepaths, relative to the plugins directory.
 614       */
 615  	protected static function get_dependency_filepaths() {
 616          if ( is_array( self::$dependency_filepaths ) ) {
 617              return self::$dependency_filepaths;
 618          }
 619  
 620          if ( null === self::$dependency_slugs ) {
 621              return array();
 622          }
 623  
 624          self::$dependency_filepaths = array();
 625  
 626          $plugin_dirnames = self::get_plugin_dirnames();
 627          foreach ( self::$dependency_slugs as $slug ) {
 628              if ( isset( $plugin_dirnames[ $slug ] ) ) {
 629                  self::$dependency_filepaths[ $slug ] = $plugin_dirnames[ $slug ];
 630                  continue;
 631              }
 632  
 633              self::$dependency_filepaths[ $slug ] = false;
 634          }
 635  
 636          return self::$dependency_filepaths;
 637      }
 638  
 639      /**
 640       * Retrieves and stores dependency plugin data from the WordPress.org Plugin API.
 641       *
 642       * @since 6.5.0
 643       *
 644       * @global string $pagenow The filename of the current screen.
 645       *
 646       * @return array|void An array of dependency API data, or void on early exit.
 647       */
 648  	protected static function get_dependency_api_data() {
 649          global $pagenow;
 650  
 651          if ( ! is_admin() || ( 'plugins.php' !== $pagenow && 'plugin-install.php' !== $pagenow ) ) {
 652              return;
 653          }
 654  
 655          if ( is_array( self::$dependency_api_data ) ) {
 656              return self::$dependency_api_data;
 657          }
 658  
 659          $plugins                   = self::get_plugins();
 660          self::$dependency_api_data = (array) get_site_transient( 'wp_plugin_dependencies_plugin_data' );
 661          foreach ( self::$dependency_slugs as $slug ) {
 662              // Set transient for individual data, remove from self::$dependency_api_data if transient expired.
 663              if ( ! get_site_transient( "wp_plugin_dependencies_plugin_timeout_{$slug}" ) ) {
 664                  unset( self::$dependency_api_data[ $slug ] );
 665                  set_site_transient( "wp_plugin_dependencies_plugin_timeout_{$slug}", true, 12 * HOUR_IN_SECONDS );
 666              }
 667  
 668              if ( isset( self::$dependency_api_data[ $slug ] ) ) {
 669                  if ( false === self::$dependency_api_data[ $slug ] ) {
 670                      $dependency_file = self::get_dependency_filepath( $slug );
 671  
 672                      if ( false === $dependency_file ) {
 673                          self::$dependency_api_data[ $slug ] = array( 'Name' => $slug );
 674                      } else {
 675                          self::$dependency_api_data[ $slug ] = array( 'Name' => $plugins[ $dependency_file ]['Name'] );
 676                      }
 677                      continue;
 678                  }
 679  
 680                  // Don't hit the Plugin API if data exists.
 681                  if ( ! empty( self::$dependency_api_data[ $slug ]['last_updated'] ) ) {
 682                      continue;
 683                  }
 684              }
 685  
 686              if ( ! function_exists( 'plugins_api' ) ) {
 687                  require_once  ABSPATH . 'wp-admin/includes/plugin-install.php';
 688              }
 689  
 690              $information = plugins_api(
 691                  'plugin_information',
 692                  array(
 693                      'slug'   => $slug,
 694                      'fields' => array(
 695                          'short_description' => true,
 696                          'icons'             => true,
 697                      ),
 698                  )
 699              );
 700  
 701              if ( is_wp_error( $information ) ) {
 702                  continue;
 703              }
 704  
 705              self::$dependency_api_data[ $slug ] = (array) $information;
 706              // plugins_api() returns 'name' not 'Name'.
 707              self::$dependency_api_data[ $slug ]['Name'] = self::$dependency_api_data[ $slug ]['name'];
 708              set_site_transient( 'wp_plugin_dependencies_plugin_data', self::$dependency_api_data, 0 );
 709          }
 710  
 711          // Remove from self::$dependency_api_data if slug no longer a dependency.
 712          $differences = array_diff( array_keys( self::$dependency_api_data ), self::$dependency_slugs );
 713          foreach ( $differences as $difference ) {
 714              unset( self::$dependency_api_data[ $difference ] );
 715          }
 716  
 717          ksort( self::$dependency_api_data );
 718          // Remove empty elements.
 719          self::$dependency_api_data = array_filter( self::$dependency_api_data );
 720          set_site_transient( 'wp_plugin_dependencies_plugin_data', self::$dependency_api_data, 0 );
 721  
 722          return self::$dependency_api_data;
 723      }
 724  
 725      /**
 726       * Gets plugin directory names.
 727       *
 728       * @since 6.5.0
 729       *
 730       * @return array An array of plugin directory names.
 731       */
 732  	protected static function get_plugin_dirnames() {
 733          if ( is_array( self::$plugin_dirnames ) ) {
 734              return self::$plugin_dirnames;
 735          }
 736  
 737          self::$plugin_dirnames = array();
 738  
 739          $plugin_files = array_keys( self::get_plugins() );
 740          foreach ( $plugin_files as $plugin_file ) {
 741              $slug                           = self::convert_to_slug( $plugin_file );
 742              self::$plugin_dirnames[ $slug ] = $plugin_file;
 743          }
 744  
 745          return self::$plugin_dirnames;
 746      }
 747  
 748      /**
 749       * Gets circular dependency data.
 750       *
 751       * @since 6.5.0
 752       *
 753       * @return array[] An array of circular dependency pairings.
 754       */
 755  	protected static function get_circular_dependencies() {
 756          if ( is_array( self::$circular_dependencies_pairs ) ) {
 757              return self::$circular_dependencies_pairs;
 758          }
 759  
 760          if ( null === self::$dependencies ) {
 761              return array();
 762          }
 763  
 764          self::$circular_dependencies_slugs = array();
 765  
 766          self::$circular_dependencies_pairs = array();
 767          foreach ( self::$dependencies as $dependent => $dependencies ) {
 768              /*
 769               * $dependent is in 'a/a.php' format. Dependencies are stored as slugs, i.e. 'a'.
 770               *
 771               * Convert $dependent to slug format for checking.
 772               */
 773              $dependent_slug = self::convert_to_slug( $dependent );
 774  
 775              self::$circular_dependencies_pairs = array_merge(
 776                  self::$circular_dependencies_pairs,
 777                  self::check_for_circular_dependencies( array( $dependent_slug ), $dependencies )
 778              );
 779          }
 780  
 781          return self::$circular_dependencies_pairs;
 782      }
 783  
 784      /**
 785       * Checks for circular dependencies.
 786       *
 787       * @since 6.5.0
 788       *
 789       * @param array $dependents   Array of dependent plugins.
 790       * @param array $dependencies Array of plugins dependencies.
 791       * @return array A circular dependency pairing, or an empty array if none exists.
 792       */
 793  	protected static function check_for_circular_dependencies( $dependents, $dependencies ) {
 794          $circular_dependencies_pairs = array();
 795  
 796          // Check for a self-dependency.
 797          $dependents_location_in_its_own_dependencies = array_intersect( $dependents, $dependencies );
 798          if ( ! empty( $dependents_location_in_its_own_dependencies ) ) {
 799              foreach ( $dependents_location_in_its_own_dependencies as $self_dependency ) {
 800                  self::$circular_dependencies_slugs[] = $self_dependency;
 801                  $circular_dependencies_pairs[]       = array( $self_dependency, $self_dependency );
 802  
 803                  // No need to check for itself again.
 804                  unset( $dependencies[ array_search( $self_dependency, $dependencies, true ) ] );
 805              }
 806          }
 807  
 808          /*
 809           * Check each dependency to see:
 810           * 1. If it has dependencies.
 811           * 2. If its list of dependencies includes one of its own dependents.
 812           */
 813          foreach ( $dependencies as $dependency ) {
 814              // Check if the dependency is also a dependent.
 815              $dependency_location_in_dependents = array_search( $dependency, self::$dependent_slugs, true );
 816  
 817              if ( false !== $dependency_location_in_dependents ) {
 818                  $dependencies_of_the_dependency = self::$dependencies[ $dependency_location_in_dependents ];
 819  
 820                  foreach ( $dependents as $dependent ) {
 821                      // Check if its dependencies includes one of its own dependents.
 822                      $dependent_location_in_dependency_dependencies = array_search(
 823                          $dependent,
 824                          $dependencies_of_the_dependency,
 825                          true
 826                      );
 827  
 828                      if ( false !== $dependent_location_in_dependency_dependencies ) {
 829                          self::$circular_dependencies_slugs[] = $dependent;
 830                          self::$circular_dependencies_slugs[] = $dependency;
 831                          $circular_dependencies_pairs[]       = array( $dependent, $dependency );
 832  
 833                          // Remove the dependent from its dependency's dependencies.
 834                          unset( $dependencies_of_the_dependency[ $dependent_location_in_dependency_dependencies ] );
 835                      }
 836                  }
 837  
 838                  $dependents[] = $dependency;
 839  
 840                  /*
 841                   * Now check the dependencies of the dependency's dependencies for the dependent.
 842                   *
 843                   * Yes, that does make sense.
 844                   */
 845                  $circular_dependencies_pairs = array_merge(
 846                      $circular_dependencies_pairs,
 847                      self::check_for_circular_dependencies( $dependents, array_unique( $dependencies_of_the_dependency ) )
 848                  );
 849              }
 850          }
 851  
 852          return $circular_dependencies_pairs;
 853      }
 854  
 855      /**
 856       * Converts a plugin filepath to a slug.
 857       *
 858       * @since 6.5.0
 859       *
 860       * @param string $plugin_file The plugin's filepath, relative to the plugins directory.
 861       * @return string The plugin's slug.
 862       */
 863  	protected static function convert_to_slug( $plugin_file ) {
 864          if ( 'hello.php' === $plugin_file ) {
 865              return 'hello-dolly';
 866          }
 867          return str_contains( $plugin_file, '/' ) ? dirname( $plugin_file ) : str_replace( '.php', '', $plugin_file );
 868      }
 869  }