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/wp-admin/includes/ -> class-wp-filesystem-base.php (source)

   1  <?php
   2  /**
   3   * Base WordPress Filesystem
   4   *
   5   * @package WordPress
   6   * @subpackage Filesystem
   7   */
   8  
   9  /**
  10   * Base WordPress Filesystem class which Filesystem implementations extend.
  11   *
  12   * @since 2.5.0
  13   */
  14  #[AllowDynamicProperties]
  15  class WP_Filesystem_Base {
  16  
  17      /**
  18       * Whether to display debug data for the connection.
  19       *
  20       * @since 2.5.0
  21       * @var bool
  22       */
  23      public $verbose = false;
  24  
  25      /**
  26       * Cached list of local filepaths to mapped remote filepaths.
  27       *
  28       * @since 2.7.0
  29       * @var array
  30       */
  31      public $cache = array();
  32  
  33      /**
  34       * The Access method of the current connection, Set automatically.
  35       *
  36       * @since 2.5.0
  37       * @var string
  38       */
  39      public $method = '';
  40  
  41      /**
  42       * @var WP_Error
  43       */
  44      public $errors = null;
  45  
  46      /**
  47       */
  48      public $options = array();
  49  
  50      /**
  51       * Returns the path on the remote filesystem of ABSPATH.
  52       *
  53       * @since 2.7.0
  54       *
  55       * @return string The location of the remote path.
  56       */
  57  	public function abspath() {
  58          $folder = $this->find_folder( ABSPATH );
  59  
  60          /*
  61           * Perhaps the FTP folder is rooted at the WordPress install.
  62           * Check for wp-includes folder in root. Could have some false positives, but rare.
  63           */
  64          if ( ! $folder && $this->is_dir( '/' . WPINC ) ) {
  65              $folder = '/';
  66          }
  67  
  68          return $folder;
  69      }
  70  
  71      /**
  72       * Returns the path on the remote filesystem of WP_CONTENT_DIR.
  73       *
  74       * @since 2.7.0
  75       *
  76       * @return string The location of the remote path.
  77       */
  78  	public function wp_content_dir() {
  79          return $this->find_folder( WP_CONTENT_DIR );
  80      }
  81  
  82      /**
  83       * Returns the path on the remote filesystem of WP_PLUGIN_DIR.
  84       *
  85       * @since 2.7.0
  86       *
  87       * @return string The location of the remote path.
  88       */
  89  	public function wp_plugins_dir() {
  90          return $this->find_folder( WP_PLUGIN_DIR );
  91      }
  92  
  93      /**
  94       * Returns the path on the remote filesystem of the Themes Directory.
  95       *
  96       * @since 2.7.0
  97       *
  98       * @param string|false $theme Optional. The theme stylesheet or template for the directory.
  99       *                            Default false.
 100       * @return string The location of the remote path.
 101       */
 102  	public function wp_themes_dir( $theme = false ) {
 103          $theme_root = get_theme_root( $theme );
 104  
 105          // Account for relative theme roots.
 106          if ( '/themes' === $theme_root || ! is_dir( $theme_root ) ) {
 107              $theme_root = WP_CONTENT_DIR . $theme_root;
 108          }
 109  
 110          return $this->find_folder( $theme_root );
 111      }
 112  
 113      /**
 114       * Returns the path on the remote filesystem of WP_LANG_DIR.
 115       *
 116       * @since 3.2.0
 117       *
 118       * @return string The location of the remote path.
 119       */
 120  	public function wp_lang_dir() {
 121          return $this->find_folder( WP_LANG_DIR );
 122      }
 123  
 124      /**
 125       * Locates a folder on the remote filesystem.
 126       *
 127       * @since 2.5.0
 128       * @deprecated 2.7.0 use WP_Filesystem_Base::abspath() or WP_Filesystem_Base::wp_*_dir() instead.
 129       * @see WP_Filesystem_Base::abspath()
 130       * @see WP_Filesystem_Base::wp_content_dir()
 131       * @see WP_Filesystem_Base::wp_plugins_dir()
 132       * @see WP_Filesystem_Base::wp_themes_dir()
 133       * @see WP_Filesystem_Base::wp_lang_dir()
 134       *
 135       * @param string $base    Optional. The folder to start searching from. Default '.'.
 136       * @param bool   $verbose Optional. True to display debug information. Default false.
 137       * @return string The location of the remote path.
 138       */
 139  	public function find_base_dir( $base = '.', $verbose = false ) {
 140          _deprecated_function( __FUNCTION__, '2.7.0', 'WP_Filesystem_Base::abspath() or WP_Filesystem_Base::wp_*_dir()' );
 141          $this->verbose = $verbose;
 142          return $this->abspath();
 143      }
 144  
 145      /**
 146       * Locates a folder on the remote filesystem.
 147       *
 148       * @since 2.5.0
 149       * @deprecated 2.7.0 use WP_Filesystem_Base::abspath() or WP_Filesystem_Base::wp_*_dir() methods instead.
 150       * @see WP_Filesystem_Base::abspath()
 151       * @see WP_Filesystem_Base::wp_content_dir()
 152       * @see WP_Filesystem_Base::wp_plugins_dir()
 153       * @see WP_Filesystem_Base::wp_themes_dir()
 154       * @see WP_Filesystem_Base::wp_lang_dir()
 155       *
 156       * @param string $base    Optional. The folder to start searching from. Default '.'.
 157       * @param bool   $verbose Optional. True to display debug information. Default false.
 158       * @return string The location of the remote path.
 159       */
 160  	public function get_base_dir( $base = '.', $verbose = false ) {
 161          _deprecated_function( __FUNCTION__, '2.7.0', 'WP_Filesystem_Base::abspath() or WP_Filesystem_Base::wp_*_dir()' );
 162          $this->verbose = $verbose;
 163          return $this->abspath();
 164      }
 165  
 166      /**
 167       * Locates a folder on the remote filesystem.
 168       *
 169       * Assumes that on Windows systems, Stripping off the Drive
 170       * letter is OK Sanitizes \\ to / in Windows filepaths.
 171       *
 172       * @since 2.7.0
 173       *
 174       * @param string $folder the folder to locate.
 175       * @return string|false The location of the remote path, false on failure.
 176       */
 177  	public function find_folder( $folder ) {
 178          if ( isset( $this->cache[ $folder ] ) ) {
 179              return $this->cache[ $folder ];
 180          }
 181  
 182          if ( stripos( $this->method, 'ftp' ) !== false ) {
 183              $constant_overrides = array(
 184                  'FTP_BASE'        => ABSPATH,
 185                  'FTP_CONTENT_DIR' => WP_CONTENT_DIR,
 186                  'FTP_PLUGIN_DIR'  => WP_PLUGIN_DIR,
 187                  'FTP_LANG_DIR'    => WP_LANG_DIR,
 188              );
 189  
 190              // Direct matches ( folder = CONSTANT/ ).
 191              foreach ( $constant_overrides as $constant => $dir ) {
 192                  if ( ! defined( $constant ) ) {
 193                      continue;
 194                  }
 195  
 196                  if ( $folder === $dir ) {
 197                      return trailingslashit( constant( $constant ) );
 198                  }
 199              }
 200  
 201              // Prefix matches ( folder = CONSTANT/subdir ),
 202              foreach ( $constant_overrides as $constant => $dir ) {
 203                  if ( ! defined( $constant ) ) {
 204                      continue;
 205                  }
 206  
 207                  if ( 0 === stripos( $folder, $dir ) ) { // $folder starts with $dir.
 208                      $potential_folder = preg_replace( '#^' . preg_quote( $dir, '#' ) . '/#i', trailingslashit( constant( $constant ) ), $folder );
 209                      $potential_folder = trailingslashit( $potential_folder );
 210  
 211                      if ( $this->is_dir( $potential_folder ) ) {
 212                          $this->cache[ $folder ] = $potential_folder;
 213  
 214                          return $potential_folder;
 215                      }
 216                  }
 217              }
 218          } elseif ( 'direct' === $this->method ) {
 219              $folder = str_replace( '\\', '/', $folder ); // Windows path sanitization.
 220  
 221              return trailingslashit( $folder );
 222          }
 223  
 224          $folder = preg_replace( '|^([a-z]{1}):|i', '', $folder ); // Strip out Windows drive letter if it's there.
 225          $folder = str_replace( '\\', '/', $folder ); // Windows path sanitization.
 226  
 227          if ( isset( $this->cache[ $folder ] ) ) {
 228              return $this->cache[ $folder ];
 229          }
 230  
 231          if ( $this->exists( $folder ) ) { // Folder exists at that absolute path.
 232              $folder                 = trailingslashit( $folder );
 233              $this->cache[ $folder ] = $folder;
 234  
 235              return $folder;
 236          }
 237  
 238          $return = $this->search_for_folder( $folder );
 239  
 240          if ( $return ) {
 241              $this->cache[ $folder ] = $return;
 242          }
 243  
 244          return $return;
 245      }
 246  
 247      /**
 248       * Locates a folder on the remote filesystem.
 249       *
 250       * Expects Windows sanitized path.
 251       *
 252       * @since 2.7.0
 253       *
 254       * @param string $folder The folder to locate.
 255       * @param string $base   The folder to start searching from.
 256       * @param bool   $loop   If the function has recursed. Internal use only.
 257       * @return string|false The location of the remote path, false to cease looping.
 258       */
 259  	public function search_for_folder( $folder, $base = '.', $loop = false ) {
 260          if ( empty( $base ) || '.' === $base ) {
 261              $base = trailingslashit( $this->cwd() );
 262          }
 263  
 264          $folder = untrailingslashit( $folder );
 265  
 266          if ( $this->verbose ) {
 267              /* translators: 1: Folder to locate, 2: Folder to start searching from. */
 268              printf( "\n" . __( 'Looking for %1$s in %2$s' ) . "<br />\n", $folder, $base );
 269          }
 270  
 271          $folder_parts     = explode( '/', $folder );
 272          $folder_part_keys = array_keys( $folder_parts );
 273          $last_index       = array_pop( $folder_part_keys );
 274          $last_path        = $folder_parts[ $last_index ];
 275  
 276          $files = $this->dirlist( $base );
 277  
 278          foreach ( $folder_parts as $index => $key ) {
 279              if ( $index === $last_index ) {
 280                  continue; // We want this to be caught by the next code block.
 281              }
 282  
 283              /*
 284               * Working from /home/ to /user/ to /wordpress/ see if that file exists within
 285               * the current folder, If it's found, change into it and follow through looking
 286               * for it. If it can't find WordPress down that route, it'll continue onto the next
 287               * folder level, and see if that matches, and so on. If it reaches the end, and still
 288               * can't find it, it'll return false for the entire function.
 289               */
 290              if ( isset( $files[ $key ] ) ) {
 291  
 292                  // Let's try that folder:
 293                  $newdir = trailingslashit( path_join( $base, $key ) );
 294  
 295                  if ( $this->verbose ) {
 296                      /* translators: %s: Directory name. */
 297                      printf( "\n" . __( 'Changing to %s' ) . "<br />\n", $newdir );
 298                  }
 299  
 300                  // Only search for the remaining path tokens in the directory, not the full path again.
 301                  $newfolder = implode( '/', array_slice( $folder_parts, $index + 1 ) );
 302                  $ret       = $this->search_for_folder( $newfolder, $newdir, $loop );
 303  
 304                  if ( $ret ) {
 305                      return $ret;
 306                  }
 307              }
 308          }
 309  
 310          /*
 311           * Only check this as a last resort, to prevent locating the incorrect install.
 312           * All above procedures will fail quickly if this is the right branch to take.
 313           */
 314          if ( isset( $files[ $last_path ] ) ) {
 315              if ( $this->verbose ) {
 316                  /* translators: %s: Directory name. */
 317                  printf( "\n" . __( 'Found %s' ) . "<br />\n", $base . $last_path );
 318              }
 319  
 320              return trailingslashit( $base . $last_path );
 321          }
 322  
 323          /*
 324           * Prevent this function from looping again.
 325           * No need to proceed if we've just searched in `/`.
 326           */
 327          if ( $loop || '/' === $base ) {
 328              return false;
 329          }
 330  
 331          /*
 332           * As an extra last resort, Change back to / if the folder wasn't found.
 333           * This comes into effect when the CWD is /home/user/ but WP is at /var/www/....
 334           */
 335          return $this->search_for_folder( $folder, '/', true );
 336      }
 337  
 338      /**
 339       * Returns the *nix-style file permissions for a file.
 340       *
 341       * From the PHP documentation page for fileperms().
 342       *
 343       * @link https://www.php.net/manual/en/function.fileperms.php
 344       *
 345       * @since 2.5.0
 346       *
 347       * @param string $file String filename.
 348       * @return string The *nix-style representation of permissions.
 349       */
 350  	public function gethchmod( $file ) {
 351          $perms = intval( $this->getchmod( $file ), 8 );
 352  
 353          if ( ( $perms & 0xC000 ) === 0xC000 ) { // Socket.
 354              $info = 's';
 355          } elseif ( ( $perms & 0xA000 ) === 0xA000 ) { // Symbolic Link.
 356              $info = 'l';
 357          } elseif ( ( $perms & 0x8000 ) === 0x8000 ) { // Regular.
 358              $info = '-';
 359          } elseif ( ( $perms & 0x6000 ) === 0x6000 ) { // Block special.
 360              $info = 'b';
 361          } elseif ( ( $perms & 0x4000 ) === 0x4000 ) { // Directory.
 362              $info = 'd';
 363          } elseif ( ( $perms & 0x2000 ) === 0x2000 ) { // Character special.
 364              $info = 'c';
 365          } elseif ( ( $perms & 0x1000 ) === 0x1000 ) { // FIFO pipe.
 366              $info = 'p';
 367          } else { // Unknown.
 368              $info = 'u';
 369          }
 370  
 371          // Owner.
 372          $info .= ( ( $perms & 0x0100 ) ? 'r' : '-' );
 373          $info .= ( ( $perms & 0x0080 ) ? 'w' : '-' );
 374          $info .= ( ( $perms & 0x0040 ) ?
 375                      ( ( $perms & 0x0800 ) ? 's' : 'x' ) :
 376                      ( ( $perms & 0x0800 ) ? 'S' : '-' ) );
 377  
 378          // Group.
 379          $info .= ( ( $perms & 0x0020 ) ? 'r' : '-' );
 380          $info .= ( ( $perms & 0x0010 ) ? 'w' : '-' );
 381          $info .= ( ( $perms & 0x0008 ) ?
 382                      ( ( $perms & 0x0400 ) ? 's' : 'x' ) :
 383                      ( ( $perms & 0x0400 ) ? 'S' : '-' ) );
 384  
 385          // World.
 386          $info .= ( ( $perms & 0x0004 ) ? 'r' : '-' );
 387          $info .= ( ( $perms & 0x0002 ) ? 'w' : '-' );
 388          $info .= ( ( $perms & 0x0001 ) ?
 389                      ( ( $perms & 0x0200 ) ? 't' : 'x' ) :
 390                      ( ( $perms & 0x0200 ) ? 'T' : '-' ) );
 391  
 392          return $info;
 393      }
 394  
 395      /**
 396       * Gets the permissions of the specified file or filepath in their octal format.
 397       *
 398       * @since 2.5.0
 399       *
 400       * @param string $file Path to the file.
 401       * @return string Mode of the file (the last 3 digits).
 402       */
 403  	public function getchmod( $file ) {
 404          return '777';
 405      }
 406  
 407      /**
 408       * Converts *nix-style file permissions to an octal number.
 409       *
 410       * Converts '-rw-r--r--' to 0644
 411       * From "info at rvgate dot nl"'s comment on the PHP documentation for chmod()
 412       *
 413       * @link https://www.php.net/manual/en/function.chmod.php#49614
 414       *
 415       * @since 2.5.0
 416       *
 417       * @param string $mode string The *nix-style file permissions.
 418       * @return string Octal representation of permissions.
 419       */
 420  	public function getnumchmodfromh( $mode ) {
 421          $realmode = '';
 422          $legal    = array( '', 'w', 'r', 'x', '-' );
 423          $attarray = preg_split( '//', $mode );
 424  
 425          for ( $i = 0, $c = count( $attarray ); $i < $c; $i++ ) {
 426              $key = array_search( $attarray[ $i ], $legal, true );
 427  
 428              if ( $key ) {
 429                  $realmode .= $legal[ $key ];
 430              }
 431          }
 432  
 433          $mode  = str_pad( $realmode, 10, '-', STR_PAD_LEFT );
 434          $trans = array(
 435              '-' => '0',
 436              'r' => '4',
 437              'w' => '2',
 438              'x' => '1',
 439          );
 440          $mode  = strtr( $mode, $trans );
 441  
 442          $newmode  = $mode[0];
 443          $newmode .= $mode[1] + $mode[2] + $mode[3];
 444          $newmode .= $mode[4] + $mode[5] + $mode[6];
 445          $newmode .= $mode[7] + $mode[8] + $mode[9];
 446  
 447          return $newmode;
 448      }
 449  
 450      /**
 451       * Determines if the string provided contains binary characters.
 452       *
 453       * @since 2.7.0
 454       *
 455       * @param string $text String to test against.
 456       * @return bool True if string is binary, false otherwise.
 457       */
 458  	public function is_binary( $text ) {
 459          return (bool) preg_match( '|[^\x20-\x7E]|', $text ); // chr(32)..chr(127)
 460      }
 461  
 462      /**
 463       * Changes the owner of a file or directory.
 464       *
 465       * Default behavior is to do nothing, override this in your subclass, if desired.
 466       *
 467       * @since 2.5.0
 468       *
 469       * @param string     $file      Path to the file or directory.
 470       * @param string|int $owner     A user name or number.
 471       * @param bool       $recursive Optional. If set to true, changes file owner recursively.
 472       *                              Default false.
 473       * @return bool True on success, false on failure.
 474       */
 475  	public function chown( $file, $owner, $recursive = false ) {
 476          return false;
 477      }
 478  
 479      /**
 480       * Connects filesystem.
 481       *
 482       * @since 2.5.0
 483       * @abstract
 484       *
 485       * @return bool True on success, false on failure (always true for WP_Filesystem_Direct).
 486       */
 487  	public function connect() {
 488          return true;
 489      }
 490  
 491      /**
 492       * Reads entire file into a string.
 493       *
 494       * @since 2.5.0
 495       * @abstract
 496       *
 497       * @param string $file Name of the file to read.
 498       * @return string|false Read data on success, false on failure.
 499       */
 500  	public function get_contents( $file ) {
 501          return false;
 502      }
 503  
 504      /**
 505       * Reads entire file into an array.
 506       *
 507       * @since 2.5.0
 508       * @abstract
 509       *
 510       * @param string $file Path to the file.
 511       * @return array|false File contents in an array on success, false on failure.
 512       */
 513  	public function get_contents_array( $file ) {
 514          return false;
 515      }
 516  
 517      /**
 518       * Writes a string to a file.
 519       *
 520       * @since 2.5.0
 521       * @abstract
 522       *
 523       * @param string    $file     Remote path to the file where to write the data.
 524       * @param string    $contents The data to write.
 525       * @param int|false $mode     Optional. The file permissions as octal number, usually 0644.
 526       *                            Default false.
 527       * @return bool True on success, false on failure.
 528       */
 529  	public function put_contents( $file, $contents, $mode = false ) {
 530          return false;
 531      }
 532  
 533      /**
 534       * Gets the current working directory.
 535       *
 536       * @since 2.5.0
 537       * @abstract
 538       *
 539       * @return string|false The current working directory on success, false on failure.
 540       */
 541  	public function cwd() {
 542          return false;
 543      }
 544  
 545      /**
 546       * Changes current directory.
 547       *
 548       * @since 2.5.0
 549       * @abstract
 550       *
 551       * @param string $dir The new current directory.
 552       * @return bool True on success, false on failure.
 553       */
 554  	public function chdir( $dir ) {
 555          return false;
 556      }
 557  
 558      /**
 559       * Changes the file group.
 560       *
 561       * @since 2.5.0
 562       * @abstract
 563       *
 564       * @param string     $file      Path to the file.
 565       * @param string|int $group     A group name or number.
 566       * @param bool       $recursive Optional. If set to true, changes file group recursively.
 567       *                              Default false.
 568       * @return bool True on success, false on failure.
 569       */
 570  	public function chgrp( $file, $group, $recursive = false ) {
 571          return false;
 572      }
 573  
 574      /**
 575       * Changes filesystem permissions.
 576       *
 577       * @since 2.5.0
 578       * @abstract
 579       *
 580       * @param string    $file      Path to the file.
 581       * @param int|false $mode      Optional. The permissions as octal number, usually 0644 for files,
 582       *                             0755 for directories. Default false.
 583       * @param bool      $recursive Optional. If set to true, changes file permissions recursively.
 584       *                             Default false.
 585       * @return bool True on success, false on failure.
 586       */
 587  	public function chmod( $file, $mode = false, $recursive = false ) {
 588          return false;
 589      }
 590  
 591      /**
 592       * Gets the file owner.
 593       *
 594       * @since 2.5.0
 595       * @abstract
 596       *
 597       * @param string $file Path to the file.
 598       * @return string|false Username of the owner on success, false on failure.
 599       */
 600  	public function owner( $file ) {
 601          return false;
 602      }
 603  
 604      /**
 605       * Gets the file's group.
 606       *
 607       * @since 2.5.0
 608       * @abstract
 609       *
 610       * @param string $file Path to the file.
 611       * @return string|false The group on success, false on failure.
 612       */
 613  	public function group( $file ) {
 614          return false;
 615      }
 616  
 617      /**
 618       * Copies a file.
 619       *
 620       * @since 2.5.0
 621       * @abstract
 622       *
 623       * @param string    $source      Path to the source file.
 624       * @param string    $destination Path to the destination file.
 625       * @param bool      $overwrite   Optional. Whether to overwrite the destination file if it exists.
 626       *                               Default false.
 627       * @param int|false $mode        Optional. The permissions as octal number, usually 0644 for files,
 628       *                               0755 for dirs. Default false.
 629       * @return bool True on success, false on failure.
 630       */
 631  	public function copy( $source, $destination, $overwrite = false, $mode = false ) {
 632          return false;
 633      }
 634  
 635      /**
 636       * Moves a file.
 637       *
 638       * @since 2.5.0
 639       * @abstract
 640       *
 641       * @param string $source      Path to the source file.
 642       * @param string $destination Path to the destination file.
 643       * @param bool   $overwrite   Optional. Whether to overwrite the destination file if it exists.
 644       *                            Default false.
 645       * @return bool True on success, false on failure.
 646       */
 647  	public function move( $source, $destination, $overwrite = false ) {
 648          return false;
 649      }
 650  
 651      /**
 652       * Deletes a file or directory.
 653       *
 654       * @since 2.5.0
 655       * @abstract
 656       *
 657       * @param string       $file      Path to the file or directory.
 658       * @param bool         $recursive Optional. If set to true, deletes files and folders recursively.
 659       *                                Default false.
 660       * @param string|false $type      Type of resource. 'f' for file, 'd' for directory.
 661       *                                Default false.
 662       * @return bool True on success, false on failure.
 663       */
 664  	public function delete( $file, $recursive = false, $type = false ) {
 665          return false;
 666      }
 667  
 668      /**
 669       * Checks if a file or directory exists.
 670       *
 671       * @since 2.5.0
 672       * @abstract
 673       *
 674       * @param string $path Path to file or directory.
 675       * @return bool Whether $path exists or not.
 676       */
 677  	public function exists( $path ) {
 678          return false;
 679      }
 680  
 681      /**
 682       * Checks if resource is a file.
 683       *
 684       * @since 2.5.0
 685       * @abstract
 686       *
 687       * @param string $file File path.
 688       * @return bool Whether $file is a file.
 689       */
 690  	public function is_file( $file ) {
 691          return false;
 692      }
 693  
 694      /**
 695       * Checks if resource is a directory.
 696       *
 697       * @since 2.5.0
 698       * @abstract
 699       *
 700       * @param string $path Directory path.
 701       * @return bool Whether $path is a directory.
 702       */
 703  	public function is_dir( $path ) {
 704          return false;
 705      }
 706  
 707      /**
 708       * Checks if a file is readable.
 709       *
 710       * @since 2.5.0
 711       * @abstract
 712       *
 713       * @param string $file Path to file.
 714       * @return bool Whether $file is readable.
 715       */
 716  	public function is_readable( $file ) {
 717          return false;
 718      }
 719  
 720      /**
 721       * Checks if a file or directory is writable.
 722       *
 723       * @since 2.5.0
 724       * @abstract
 725       *
 726       * @param string $path Path to file or directory.
 727       * @return bool Whether $path is writable.
 728       */
 729  	public function is_writable( $path ) {
 730          return false;
 731      }
 732  
 733      /**
 734       * Gets the file's last access time.
 735       *
 736       * @since 2.5.0
 737       * @abstract
 738       *
 739       * @param string $file Path to file.
 740       * @return int|false Unix timestamp representing last access time, false on failure.
 741       */
 742  	public function atime( $file ) {
 743          return false;
 744      }
 745  
 746      /**
 747       * Gets the file modification time.
 748       *
 749       * @since 2.5.0
 750       * @abstract
 751       *
 752       * @param string $file Path to file.
 753       * @return int|false Unix timestamp representing modification time, false on failure.
 754       */
 755  	public function mtime( $file ) {
 756          return false;
 757      }
 758  
 759      /**
 760       * Gets the file size (in bytes).
 761       *
 762       * @since 2.5.0
 763       * @abstract
 764       *
 765       * @param string $file Path to file.
 766       * @return int|false Size of the file in bytes on success, false on failure.
 767       */
 768  	public function size( $file ) {
 769          return false;
 770      }
 771  
 772      /**
 773       * Sets the access and modification times of a file.
 774       *
 775       * Note: If $file doesn't exist, it will be created.
 776       *
 777       * @since 2.5.0
 778       * @abstract
 779       *
 780       * @param string $file  Path to file.
 781       * @param int    $time  Optional. Modified time to set for file.
 782       *                      Default 0.
 783       * @param int    $atime Optional. Access time to set for file.
 784       *                      Default 0.
 785       * @return bool True on success, false on failure.
 786       */
 787  	public function touch( $file, $time = 0, $atime = 0 ) {
 788          return false;
 789      }
 790  
 791      /**
 792       * Creates a directory.
 793       *
 794       * @since 2.5.0
 795       * @abstract
 796       *
 797       * @param string           $path  Path for new directory.
 798       * @param int|false        $chmod Optional. The permissions as octal number (or false to skip chmod).
 799       *                                Default false.
 800       * @param string|int|false $chown Optional. A user name or number (or false to skip chown).
 801       *                                Default false.
 802       * @param string|int|false $chgrp Optional. A group name or number (or false to skip chgrp).
 803       *                                Default false.
 804       * @return bool True on success, false on failure.
 805       */
 806  	public function mkdir( $path, $chmod = false, $chown = false, $chgrp = false ) {
 807          return false;
 808      }
 809  
 810      /**
 811       * Deletes a directory.
 812       *
 813       * @since 2.5.0
 814       * @abstract
 815       *
 816       * @param string $path      Path to directory.
 817       * @param bool   $recursive Optional. Whether to recursively remove files/directories.
 818       *                          Default false.
 819       * @return bool True on success, false on failure.
 820       */
 821  	public function rmdir( $path, $recursive = false ) {
 822          return false;
 823      }
 824  
 825      /**
 826       * Gets details for files in a directory or a specific file.
 827       *
 828       * @since 2.5.0
 829       * @abstract
 830       *
 831       * @param string $path           Path to directory or file.
 832       * @param bool   $include_hidden Optional. Whether to include details of hidden ("." prefixed) files.
 833       *                               Default true.
 834       * @param bool   $recursive      Optional. Whether to recursively include file details in nested directories.
 835       *                               Default false.
 836       * @return array|false {
 837       *     Array of arrays containing file information. False if unable to list directory contents.
 838       *
 839       *     @type array ...$0 {
 840       *         Array of file information. Note that some elements may not be available on all filesystems.
 841       *
 842       *         @type string           $name        Name of the file or directory.
 843       *         @type string           $perms       *nix representation of permissions.
 844       *         @type string           $permsn      Octal representation of permissions.
 845       *         @type int|string|false $number      File number. May be a numeric string. False if not available.
 846       *         @type string|false     $owner       Owner name or ID, or false if not available.
 847       *         @type string|false     $group       File permissions group, or false if not available.
 848       *         @type int|string|false $size        Size of file in bytes. May be a numeric string.
 849       *                                             False if not available.
 850       *         @type int|string|false $lastmodunix Last modified unix timestamp. May be a numeric string.
 851       *                                             False if not available.
 852       *         @type string|false     $lastmod     Last modified month (3 letters) and day (without leading 0), or
 853       *                                             false if not available.
 854       *         @type string|false     $time        Last modified time, or false if not available.
 855       *         @type string           $type        Type of resource. 'f' for file, 'd' for directory, 'l' for link.
 856       *         @type array|false      $files       If a directory and `$recursive` is true, contains another array of
 857       *                                             files. False if unable to list directory contents.
 858       *     }
 859       * }
 860       */
 861  	public function dirlist( $path, $include_hidden = true, $recursive = false ) {
 862          return false;
 863      }
 864  }


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