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/**
 * Creates common globals for the rest of WordPress
 *
 * Sets $pagenow global which is the filename of the current screen.
 * Checks for the browser to set which one is currently being used.
 *
 * Detects which user environment WordPress is being used on.
 * Only attempts to check for Apache, Nginx and IIS -- three web
 * servers with known pretty permalink capability.
 *
 * Note: Though Nginx is detected, WordPress does not currently
 * generate rewrite rules for it. See https://wordpress.org/documentation/article/nginx/
 *
 * @package WordPress
 */

global $pagenow,
	$is_lynx, $is_gecko, $is_winIE, $is_macIE, $is_opera, $is_NS4, $is_safari, $is_chrome, $is_iphone, $is_IE, $is_edge,
	$is_apache, $is_IIS, $is_iis7, $is_nginx;

// On which page are we?
if ( is_admin() ) {
	// wp-admin pages are checked more carefully.
	if ( is_network_admin() ) {
		preg_match( &#039;#/wp-admin/network/?(.*?)$#i&#039;, $_SERVER[&#039;PHP_SELF&#039;], $self_matches );
	} elseif ( is_user_admin() ) {
		preg_match( &#039;#/wp-admin/user/?(.*?)$#i&#039;, $_SERVER[&#039;PHP_SELF&#039;], $self_matches );
	} else {
		preg_match( &#039;#/wp-admin/?(.*?)$#i&#039;, $_SERVER[&#039;PHP_SELF&#039;], $self_matches );
	}

	$pagenow = ! empty( $self_matches[1] ) ? $self_matches[1] : &#039;&#039;;
	$pagenow = trim( $pagenow, &#039;/&#039; );
	$pagenow = preg_replace( &#039;#\?.*?$#&#039;, &#039;&#039;, $pagenow );

	if ( &#039;&#039; === $pagenow || &#039;index&#039; === $pagenow || &#039;index.php&#039; === $pagenow ) {
		$pagenow = &#039;index.php&#039;;
	} else {
		preg_match( &#039;#(.*?)(/|$)#&#039;, $pagenow, $self_matches );
		$pagenow = strtolower( $self_matches[1] );
		if ( &#039;.php&#039; !== substr( $pagenow, -4, 4 ) ) {
			$pagenow .= &#039;.php&#039;; // For `Options +Multiviews`: /wp-admin/themes/index.php (themes.php is queried).
		}
	}
} else {
	if ( preg_match( &#039;#([^/]+\.php)([?/].*?)?$#i&#039;, $_SERVER[&#039;PHP_SELF&#039;], $self_matches ) ) {
		$pagenow = strtolower( $self_matches[1] );
	} else {
		$pagenow = &#039;index.php&#039;;
	}
}
unset( $self_matches );

// Simple browser detection.
$is_lynx   = false;
$is_gecko  = false;
$is_winIE  = false;
$is_macIE  = false;
$is_opera  = false;
$is_NS4    = false;
$is_safari = false;
$is_chrome = false;
$is_iphone = false;
$is_edge   = false;

if ( isset( $_SERVER[&#039;HTTP_USER_AGENT&#039;] ) ) {
	if ( strpos( $_SERVER[&#039;HTTP_USER_AGENT&#039;], &#039;Lynx&#039; ) !== false ) {
		$is_lynx = true;
	} elseif ( strpos( $_SERVER[&#039;HTTP_USER_AGENT&#039;], &#039;Edg&#039; ) !== false ) {
		$is_edge = true;
	} elseif ( stripos( $_SERVER[&#039;HTTP_USER_AGENT&#039;], &#039;chrome&#039; ) !== false ) {
		if ( stripos( $_SERVER[&#039;HTTP_USER_AGENT&#039;], &#039;chromeframe&#039; ) !== false ) {
			$is_admin = is_admin();
			/**
			 * Filters whether Google Chrome Frame should be used, if available.
			 *
			 * @since 3.2.0
			 *
			 * @param bool $is_admin Whether to use the Google Chrome Frame. Default is the value of is_admin().
			 */
			$is_chrome = apply_filters( &#039;use_google_chrome_frame&#039;, $is_admin );
			if ( $is_chrome ) {
				header( &#039;X-UA-Compatible: chrome=1&#039; );
			}
			$is_winIE = ! $is_chrome;
		} else {
			$is_chrome = true;
		}
	} elseif ( stripos( $_SERVER[&#039;HTTP_USER_AGENT&#039;], &#039;safari&#039; ) !== false ) {
		$is_safari = true;
	} elseif ( ( strpos( $_SERVER[&#039;HTTP_USER_AGENT&#039;], &#039;MSIE&#039; ) !== false || strpos( $_SERVER[&#039;HTTP_USER_AGENT&#039;], &#039;Trident&#039; ) !== false ) &amp;&amp; strpos( $_SERVER[&#039;HTTP_USER_AGENT&#039;], &#039;Win&#039; ) !== false ) {
		$is_winIE = true;
	} elseif ( strpos( $_SERVER[&#039;HTTP_USER_AGENT&#039;], &#039;MSIE&#039; ) !== false &amp;&amp; strpos( $_SERVER[&#039;HTTP_USER_AGENT&#039;], &#039;Mac&#039; ) !== false ) {
		$is_macIE = true;
	} elseif ( strpos( $_SERVER[&#039;HTTP_USER_AGENT&#039;], &#039;Gecko&#039; ) !== false ) {
		$is_gecko = true;
	} elseif ( strpos( $_SERVER[&#039;HTTP_USER_AGENT&#039;], &#039;Opera&#039; ) !== false ) {
		$is_opera = true;
	} elseif ( strpos( $_SERVER[&#039;HTTP_USER_AGENT&#039;], &#039;Nav&#039; ) !== false &amp;&amp; strpos( $_SERVER[&#039;HTTP_USER_AGENT&#039;], &#039;Mozilla/4.&#039; ) !== false ) {
		$is_NS4 = true;
	}
}

if ( $is_safari &amp;&amp; stripos( $_SERVER[&#039;HTTP_USER_AGENT&#039;], &#039;mobile&#039; ) !== false ) {
	$is_iphone = true;
}

$is_IE = ( $is_macIE || $is_winIE );

// Server detection.

/**
 * Whether the server software is Apache or something else
 *
 * @global bool $is_apache
 */
$is_apache = ( strpos( $_SERVER[&#039;SERVER_SOFTWARE&#039;], &#039;Apache&#039; ) !== false || strpos( $_SERVER[&#039;SERVER_SOFTWARE&#039;], &#039;LiteSpeed&#039; ) !== false );

/**
 * Whether the server software is Nginx or something else
 *
 * @global bool $is_nginx
 */
$is_nginx = ( strpos( $_SERVER[&#039;SERVER_SOFTWARE&#039;], &#039;nginx&#039; ) !== false );

/**
 * Whether the server software is IIS or something else
 *
 * @global bool $is_IIS
 */
$is_IIS = ! $is_apache &amp;&amp; ( strpos( $_SERVER[&#039;SERVER_SOFTWARE&#039;], &#039;Microsoft-IIS&#039; ) !== false || strpos( $_SERVER[&#039;SERVER_SOFTWARE&#039;], &#039;ExpressionDevServer&#039; ) !== false );

/**
 * Whether the server software is IIS 7.X or greater
 *
 * @global bool $is_iis7
 */
$is_iis7 = $is_IIS &amp;&amp; (int) substr( $_SERVER[&#039;SERVER_SOFTWARE&#039;], strpos( $_SERVER[&#039;SERVER_SOFTWARE&#039;], &#039;Microsoft-IIS/&#039; ) + 14 ) &gt;= 7;

/**
 * Test if the current browser runs on a mobile device (smart phone, tablet, etc.)
 *
 * @since 3.4.0
 *
 * @return bool
 */
function wp_is_mobile() {
	if ( empty( $_SERVER[&#039;HTTP_USER_AGENT&#039;] ) ) {
		$is_mobile = false;
	} elseif ( strpos( $_SERVER[&#039;HTTP_USER_AGENT&#039;], &#039;Mobile&#039; ) !== false // Many mobile devices (all iPhone, iPad, etc.)
		|| strpos( $_SERVER[&#039;HTTP_USER_AGENT&#039;], &#039;Android&#039; ) !== false
		|| strpos( $_SERVER[&#039;HTTP_USER_AGENT&#039;], &#039;Silk/&#039; ) !== false
		|| strpos( $_SERVER[&#039;HTTP_USER_AGENT&#039;], &#039;Kindle&#039; ) !== false
		|| strpos( $_SERVER[&#039;HTTP_USER_AGENT&#039;], &#039;BlackBerry&#039; ) !== false
		|| strpos( $_SERVER[&#039;HTTP_USER_AGENT&#039;], &#039;Opera Mini&#039; ) !== false
		|| strpos( $_SERVER[&#039;HTTP_USER_AGENT&#039;], &#039;Opera Mobi&#039; ) !== false ) {
			$is_mobile = true;
	} else {
		$is_mobile = false;
	}

	/**
	 * Filters whether the request should be treated as coming from a mobile device or not.
	 *
	 * @since 4.9.0
	 *
	 * @param bool $is_mobile Whether the request is from a mobile device or not.
	 */
	return apply_filters( &#039;wp_is_mobile&#039;, $is_mobile );
}
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