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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://wordpress.org/support/article/nginx/
  14   *
  15   * @package WordPress
  16   */
  17  
  18  global $pagenow,
  19      $is_lynx, $is_gecko, $is_winIE, $is_macIE, $is_opera, $is_NS4, $is_safari, $is_chrome, $is_iphone, $is_IE, $is_edge,
  20      $is_apache, $is_IIS, $is_iis7, $is_nginx;
  21  
  22  // On which page are we?
  23  if ( is_admin() ) {
  24      // wp-admin pages are checked more carefully.
  25      if ( is_network_admin() ) {
  26          preg_match( '#/wp-admin/network/?(.*?)$#i', $_SERVER['PHP_SELF'], $self_matches );
  27      } elseif ( is_user_admin() ) {
  28          preg_match( '#/wp-admin/user/?(.*?)$#i', $_SERVER['PHP_SELF'], $self_matches );
  29      } else {
  30          preg_match( '#/wp-admin/?(.*?)$#i', $_SERVER['PHP_SELF'], $self_matches );
  31      }
  32  
  33      $pagenow = ! empty( $self_matches[1] ) ? $self_matches[1] : '';
  34      $pagenow = trim( $pagenow, '/' );
  35      $pagenow = preg_replace( '#\?.*?$#', '', $pagenow );
  36  
  37      if ( '' === $pagenow || 'index' === $pagenow || 'index.php' === $pagenow ) {
  38          $pagenow = 'index.php';
  39      } else {
  40          preg_match( '#(.*?)(/|$)#', $pagenow, $self_matches );
  41          $pagenow = strtolower( $self_matches[1] );
  42          if ( '.php' !== substr( $pagenow, -4, 4 ) ) {
  43              $pagenow .= '.php'; // For `Options +Multiviews`: /wp-admin/themes/index.php (themes.php is queried).
  44          }
  45      }
  46  } else {
  47      if ( preg_match( '#([^/]+\.php)([?/].*?)?$#i', $_SERVER['PHP_SELF'], $self_matches ) ) {
  48          $pagenow = strtolower( $self_matches[1] );
  49      } else {
  50          $pagenow = 'index.php';
  51      }
  52  }
  53  unset( $self_matches );
  54  
  55  // Simple browser detection.
  56  $is_lynx   = false;
  57  $is_gecko  = false;
  58  $is_winIE  = false;
  59  $is_macIE  = false;
  60  $is_opera  = false;
  61  $is_NS4    = false;
  62  $is_safari = false;
  63  $is_chrome = false;
  64  $is_iphone = false;
  65  $is_edge   = false;
  66  
  67  if ( isset( $_SERVER['HTTP_USER_AGENT'] ) ) {
  68      if ( strpos( $_SERVER['HTTP_USER_AGENT'], 'Lynx' ) !== false ) {
  69          $is_lynx = true;
  70      } elseif ( strpos( $_SERVER['HTTP_USER_AGENT'], 'Edg' ) !== false ) {
  71          $is_edge = true;
  72      } elseif ( stripos( $_SERVER['HTTP_USER_AGENT'], 'chrome' ) !== false ) {
  73          if ( stripos( $_SERVER['HTTP_USER_AGENT'], 'chromeframe' ) !== false ) {
  74              $is_admin = is_admin();
  75              /**
  76               * Filters whether Google Chrome Frame should be used, if available.
  77               *
  78               * @since 3.2.0
  79               *
  80               * @param bool $is_admin Whether to use the Google Chrome Frame. Default is the value of is_admin().
  81               */
  82              $is_chrome = apply_filters( 'use_google_chrome_frame', $is_admin );
  83              if ( $is_chrome ) {
  84                  header( 'X-UA-Compatible: chrome=1' );
  85              }
  86              $is_winIE = ! $is_chrome;
  87          } else {
  88              $is_chrome = true;
  89          }
  90      } elseif ( stripos( $_SERVER['HTTP_USER_AGENT'], 'safari' ) !== false ) {
  91          $is_safari = true;
  92      } elseif ( ( strpos( $_SERVER['HTTP_USER_AGENT'], 'MSIE' ) !== false || strpos( $_SERVER['HTTP_USER_AGENT'], 'Trident' ) !== false ) && strpos( $_SERVER['HTTP_USER_AGENT'], 'Win' ) !== false ) {
  93          $is_winIE = true;
  94      } elseif ( strpos( $_SERVER['HTTP_USER_AGENT'], 'MSIE' ) !== false && strpos( $_SERVER['HTTP_USER_AGENT'], 'Mac' ) !== false ) {
  95          $is_macIE = true;
  96      } elseif ( strpos( $_SERVER['HTTP_USER_AGENT'], 'Gecko' ) !== false ) {
  97          $is_gecko = true;
  98      } elseif ( strpos( $_SERVER['HTTP_USER_AGENT'], 'Opera' ) !== false ) {
  99          $is_opera = true;
 100      } elseif ( strpos( $_SERVER['HTTP_USER_AGENT'], 'Nav' ) !== false && strpos( $_SERVER['HTTP_USER_AGENT'], 'Mozilla/4.' ) !== false ) {
 101          $is_NS4 = true;
 102      }
 103  }
 104  
 105  if ( $is_safari && stripos( $_SERVER['HTTP_USER_AGENT'], 'mobile' ) !== false ) {
 106      $is_iphone = true;
 107  }
 108  
 109  $is_IE = ( $is_macIE || $is_winIE );
 110  
 111  // Server detection.
 112  
 113  /**
 114   * Whether the server software is Apache or something else
 115   *
 116   * @global bool $is_apache
 117   */
 118  $is_apache = ( strpos( $_SERVER['SERVER_SOFTWARE'], 'Apache' ) !== false || strpos( $_SERVER['SERVER_SOFTWARE'], 'LiteSpeed' ) !== false );
 119  
 120  /**
 121   * Whether the server software is Nginx or something else
 122   *
 123   * @global bool $is_nginx
 124   */
 125  $is_nginx = ( strpos( $_SERVER['SERVER_SOFTWARE'], 'nginx' ) !== false );
 126  
 127  /**
 128   * Whether the server software is IIS or something else
 129   *
 130   * @global bool $is_IIS
 131   */
 132  $is_IIS = ! $is_apache && ( strpos( $_SERVER['SERVER_SOFTWARE'], 'Microsoft-IIS' ) !== false || strpos( $_SERVER['SERVER_SOFTWARE'], 'ExpressionDevServer' ) !== false );
 133  
 134  /**
 135   * Whether the server software is IIS 7.X or greater
 136   *
 137   * @global bool $is_iis7
 138   */
 139  $is_iis7 = $is_IIS && (int) substr( $_SERVER['SERVER_SOFTWARE'], strpos( $_SERVER['SERVER_SOFTWARE'], 'Microsoft-IIS/' ) + 14 ) >= 7;
 140  
 141  /**
 142   * Test if the current browser runs on a mobile device (smart phone, tablet, etc.)
 143   *
 144   * @since 3.4.0
 145   *
 146   * @return bool
 147   */
 148  function wp_is_mobile() {
 149      if ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
 150          $is_mobile = false;
 151      } elseif ( strpos( $_SERVER['HTTP_USER_AGENT'], 'Mobile' ) !== false // Many mobile devices (all iPhone, iPad, etc.)
 152          || strpos( $_SERVER['HTTP_USER_AGENT'], 'Android' ) !== false
 153          || strpos( $_SERVER['HTTP_USER_AGENT'], 'Silk/' ) !== false
 154          || strpos( $_SERVER['HTTP_USER_AGENT'], 'Kindle' ) !== false
 155          || strpos( $_SERVER['HTTP_USER_AGENT'], 'BlackBerry' ) !== false
 156          || strpos( $_SERVER['HTTP_USER_AGENT'], 'Opera Mini' ) !== false
 157          || strpos( $_SERVER['HTTP_USER_AGENT'], 'Opera Mobi' ) !== false ) {
 158              $is_mobile = true;
 159      } else {
 160          $is_mobile = false;
 161      }
 162  
 163      /**
 164       * Filters whether the request should be treated as coming from a mobile device or not.
 165       *
 166       * @since 4.9.0
 167       *
 168       * @param bool $is_mobile Whether the request is from a mobile device or not.
 169       */
 170      return apply_filters( 'wp_is_mobile', $is_mobile );
 171  }