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   1  <?php
   2  /**
   3   * Creates common globals for the rest of WordPress
   4   *
   5   * Sets $pagenow global which is the filename of the current screen.
   6   * Checks for the browser to set which one is currently being used.
   7   *
   8   * Detects which user environment WordPress is being used on.
   9   * Only attempts to check for Apache, Nginx and IIS -- three web
  10   * servers with known pretty permalink capability.
  11   *
  12   * Note: Though Nginx is detected, WordPress does not currently
  13   * generate rewrite rules for it. See https://developer.wordpress.org/advanced-administration/server/web-server/nginx/
  14   *
  15   * @package WordPress
  16   */
  17  
  18  // Don't load directly.
  19  if ( ! defined( 'ABSPATH' ) ) {
  20      die( '-1' );
  21  }
  22  
  23  global $pagenow,
  24      $is_lynx, $is_gecko, $is_winIE, $is_macIE, $is_opera, $is_NS4, $is_safari, $is_chrome, $is_iphone, $is_IE, $is_edge,
  25      $is_apache, $is_IIS, $is_iis7, $is_nginx, $is_caddy;
  26  
  27  // On which page are we?
  28  if ( is_admin() ) {
  29      // wp-admin pages are checked more carefully.
  30      if ( is_network_admin() ) {
  31          preg_match( '#/wp-admin/network/?(.*?)$#i', $_SERVER['PHP_SELF'], $self_matches );
  32      } elseif ( is_user_admin() ) {
  33          preg_match( '#/wp-admin/user/?(.*?)$#i', $_SERVER['PHP_SELF'], $self_matches );
  34      } else {
  35          preg_match( '#/wp-admin/?(.*?)$#i', $_SERVER['PHP_SELF'], $self_matches );
  36      }
  37  
  38      $pagenow = ! empty( $self_matches[1] ) ? $self_matches[1] : '';
  39      $pagenow = trim( $pagenow, '/' );
  40      $pagenow = preg_replace( '#\?.*?$#', '', $pagenow );
  41  
  42      if ( '' === $pagenow || 'index' === $pagenow || 'index.php' === $pagenow ) {
  43          $pagenow = 'index.php';
  44      } else {
  45          preg_match( '#(.*?)(/|$)#', $pagenow, $self_matches );
  46          $pagenow = strtolower( $self_matches[1] );
  47          if ( ! str_ends_with( $pagenow, '.php' ) ) {
  48              $pagenow .= '.php'; // For `Options +Multiviews`: /wp-admin/themes/index.php (themes.php is queried).
  49          }
  50      }
  51  } else {
  52      if ( preg_match( '#([^/]+\.php)([?/].*?)?$#i', $_SERVER['PHP_SELF'], $self_matches ) ) {
  53          $pagenow = strtolower( $self_matches[1] );
  54      } else {
  55          $pagenow = 'index.php';
  56      }
  57  }
  58  unset( $self_matches );
  59  
  60  // Simple browser detection.
  61  $is_lynx   = false;
  62  $is_gecko  = false;
  63  $is_winIE  = false;
  64  $is_macIE  = false;
  65  $is_opera  = false;
  66  $is_NS4    = false;
  67  $is_safari = false;
  68  $is_chrome = false;
  69  $is_iphone = false;
  70  $is_edge   = false;
  71  
  72  if ( isset( $_SERVER['HTTP_USER_AGENT'] ) ) {
  73      if ( str_contains( $_SERVER['HTTP_USER_AGENT'], 'Lynx' ) ) {
  74          $is_lynx = true;
  75      } elseif ( str_contains( $_SERVER['HTTP_USER_AGENT'], 'Edg' ) ) {
  76          $is_edge = true;
  77      } elseif ( str_contains( $_SERVER['HTTP_USER_AGENT'], 'Opera' ) || str_contains( $_SERVER['HTTP_USER_AGENT'], 'OPR/' ) ) {
  78          $is_opera = true;
  79      } elseif ( stripos( $_SERVER['HTTP_USER_AGENT'], 'chrome' ) !== false ) {
  80          if ( stripos( $_SERVER['HTTP_USER_AGENT'], 'chromeframe' ) !== false ) {
  81              $is_admin = is_admin();
  82              /**
  83               * Filters whether Google Chrome Frame should be used, if available.
  84               *
  85               * @since 3.2.0
  86               *
  87               * @param bool $is_admin Whether to use the Google Chrome Frame. Default is the value of is_admin().
  88               */
  89              $is_chrome = apply_filters( 'use_google_chrome_frame', $is_admin );
  90              if ( $is_chrome ) {
  91                  header( 'X-UA-Compatible: chrome=1' );
  92              }
  93              $is_winIE = ! $is_chrome;
  94          } else {
  95              $is_chrome = true;
  96          }
  97      } elseif ( stripos( $_SERVER['HTTP_USER_AGENT'], 'safari' ) !== false ) {
  98          $is_safari = true;
  99      } elseif ( ( str_contains( $_SERVER['HTTP_USER_AGENT'], 'MSIE' ) || str_contains( $_SERVER['HTTP_USER_AGENT'], 'Trident' ) )
 100          && str_contains( $_SERVER['HTTP_USER_AGENT'], 'Win' )
 101      ) {
 102          $is_winIE = true;
 103      } elseif ( str_contains( $_SERVER['HTTP_USER_AGENT'], 'MSIE' ) && str_contains( $_SERVER['HTTP_USER_AGENT'], 'Mac' ) ) {
 104          $is_macIE = true;
 105      } elseif ( str_contains( $_SERVER['HTTP_USER_AGENT'], 'Gecko' ) ) {
 106          $is_gecko = true;
 107      } elseif ( str_contains( $_SERVER['HTTP_USER_AGENT'], 'Nav' ) && str_contains( $_SERVER['HTTP_USER_AGENT'], 'Mozilla/4.' ) ) {
 108          $is_NS4 = true;
 109      }
 110  }
 111  
 112  if ( $is_safari && stripos( $_SERVER['HTTP_USER_AGENT'], 'mobile' ) !== false ) {
 113      $is_iphone = true;
 114  }
 115  
 116  $is_IE = ( $is_macIE || $is_winIE );
 117  
 118  // Server detection.
 119  
 120  /**
 121   * Whether the server software is Apache or something else.
 122   *
 123   * @global bool $is_apache
 124   */
 125  $is_apache = ( str_contains( $_SERVER['SERVER_SOFTWARE'], 'Apache' ) || str_contains( $_SERVER['SERVER_SOFTWARE'], 'LiteSpeed' ) );
 126  
 127  /**
 128   * Whether the server software is Nginx or something else.
 129   *
 130   * @global bool $is_nginx
 131   */
 132  $is_nginx = ( str_contains( $_SERVER['SERVER_SOFTWARE'], 'nginx' ) );
 133  
 134  /**
 135   * Whether the server software is Caddy / FrankenPHP or something else.
 136   *
 137   * @global bool $is_caddy
 138   */
 139  $is_caddy = ( str_contains( $_SERVER['SERVER_SOFTWARE'], 'Caddy' ) || str_contains( $_SERVER['SERVER_SOFTWARE'], 'FrankenPHP' ) );
 140  
 141  /**
 142   * Whether the server software is IIS or something else.
 143   *
 144   * @global bool $is_IIS
 145   */
 146  $is_IIS = ! $is_apache && ( str_contains( $_SERVER['SERVER_SOFTWARE'], 'Microsoft-IIS' ) || str_contains( $_SERVER['SERVER_SOFTWARE'], 'ExpressionDevServer' ) );
 147  
 148  /**
 149   * Whether the server software is IIS 7.X or greater.
 150   *
 151   * @global bool $is_iis7
 152   */
 153  $is_iis7 = $is_IIS && (int) substr( $_SERVER['SERVER_SOFTWARE'], strpos( $_SERVER['SERVER_SOFTWARE'], 'Microsoft-IIS/' ) + 14 ) >= 7;
 154  
 155  /**
 156   * Test if the current browser runs on a mobile device (smart phone, tablet, etc.).
 157   *
 158   * @since 3.4.0
 159   * @since 6.4.0 Added checking for the Sec-CH-UA-Mobile request header.
 160   *
 161   * @return bool
 162   */
 163  function wp_is_mobile() {
 164      if ( isset( $_SERVER['HTTP_SEC_CH_UA_MOBILE'] ) ) {
 165          // This is the `Sec-CH-UA-Mobile` user agent client hint HTTP request header.
 166          // See <https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Sec-CH-UA-Mobile>.
 167          $is_mobile = ( '?1' === $_SERVER['HTTP_SEC_CH_UA_MOBILE'] );
 168      } elseif ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
 169          $is_mobile = false;
 170      } elseif ( str_contains( $_SERVER['HTTP_USER_AGENT'], 'Mobile' ) // Many mobile devices (all iPhone, iPad, etc.)
 171          || str_contains( $_SERVER['HTTP_USER_AGENT'], 'Android' )
 172          || str_contains( $_SERVER['HTTP_USER_AGENT'], 'Silk/' )
 173          || str_contains( $_SERVER['HTTP_USER_AGENT'], 'Kindle' )
 174          || str_contains( $_SERVER['HTTP_USER_AGENT'], 'BlackBerry' )
 175          || str_contains( $_SERVER['HTTP_USER_AGENT'], 'Opera Mini' )
 176          || str_contains( $_SERVER['HTTP_USER_AGENT'], 'Opera Mobi' ) ) {
 177              $is_mobile = true;
 178      } else {
 179          $is_mobile = false;
 180      }
 181  
 182      /**
 183       * Filters whether the request should be treated as coming from a mobile device or not.
 184       *
 185       * @since 4.9.0
 186       *
 187       * @param bool $is_mobile Whether the request is from a mobile device or not.
 188       */
 189      return apply_filters( 'wp_is_mobile', $is_mobile );
 190  }