<?php

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/**

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* Creates common globals for the rest of WordPress

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*

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* Sets $pagenow global which is the filename of the current screen.

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* Checks for the browser to set which one is currently being used.

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*

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* Detects which user environment WordPress is being used on.

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* Only attempts to check for Apache, Nginx and IIS -- three web

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* servers with known pretty permalink capability.

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*

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* Note: Though Nginx is detected, WordPress does not currently

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* generate rewrite rules for it. See https://developer.wordpress.org/advanced-administration/server/web-server/nginx/

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*

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* @package WordPress

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*/

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// Don't load directly.

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if ( ! defined( 'ABSPATH' ) ) {

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die( '-1' );

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}

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global $pagenow,

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$is_lynx, $is_gecko, $is_winIE, $is_macIE, $is_opera, $is_NS4, $is_safari, $is_chrome, $is_iphone, $is_IE, $is_edge,

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$is_apache, $is_IIS, $is_iis7, $is_nginx, $is_caddy;

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// On which page are we?

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if ( is_admin() ) {

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// wp-admin pages are checked more carefully.

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if ( is_network_admin() ) {

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preg_match( '#/wp-admin/network/?(.*?)$#i', $_SERVER['PHP_SELF'], $self_matches );

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} elseif ( is_user_admin() ) {

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preg_match( '#/wp-admin/user/?(.*?)$#i', $_SERVER['PHP_SELF'], $self_matches );

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} else {

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preg_match( '#/wp-admin/?(.*?)$#i', $_SERVER['PHP_SELF'], $self_matches );

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}

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$pagenow = ! empty( $self_matches[1] ) ? $self_matches[1] : '';

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$pagenow = trim( $pagenow, '/' );

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$pagenow = preg_replace( '#\?.*?$#', '', $pagenow );

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if ( '' === $pagenow || 'index' === $pagenow || 'index.php' === $pagenow ) {

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$pagenow = 'index.php';

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} else {

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preg_match( '#(.*?)(/|$)#', $pagenow, $self_matches );

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$pagenow = strtolower( $self_matches[1] );

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if ( ! str_ends_with( $pagenow, '.php' ) ) {

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$pagenow .= '.php'; // For `Options +Multiviews`: /wp-admin/themes/index.php (themes.php is queried).

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}

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}

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} else {

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if ( preg_match( '#([^/]+\.php)([?/].*?)?$#i', $_SERVER['PHP_SELF'], $self_matches ) ) {

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$pagenow = strtolower( $self_matches[1] );

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} else {

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$pagenow = 'index.php';

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}

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}

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unset( $self_matches );

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// Simple browser detection.

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$is_lynx = false;

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$is_gecko = false;

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$is_winIE = false;

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$is_macIE = false;

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$is_opera = false;

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$is_NS4 = false;

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$is_safari = false;

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$is_chrome = false;

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$is_iphone = false;

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$is_edge = false;

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if ( isset( $_SERVER['HTTP_USER_AGENT'] ) ) {

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if ( str_contains( $_SERVER['HTTP_USER_AGENT'], 'Lynx' ) ) {

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$is_lynx = true;

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} elseif ( str_contains( $_SERVER['HTTP_USER_AGENT'], 'Edg' ) ) {

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$is_edge = true;

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} elseif ( str_contains( $_SERVER['HTTP_USER_AGENT'], 'Opera' ) || str_contains( $_SERVER['HTTP_USER_AGENT'], 'OPR/' ) ) {

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$is_opera = true;

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} elseif ( stripos( $_SERVER['HTTP_USER_AGENT'], 'chrome' ) !== false ) {

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if ( stripos( $_SERVER['HTTP_USER_AGENT'], 'chromeframe' ) !== false ) {

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$is_admin = is_admin();

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/**

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* Filters whether Google Chrome Frame should be used, if available.

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*

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* @since 3.2.0

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*

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* @param bool $is_admin Whether to use the Google Chrome Frame. Default is the value of is_admin().

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*/

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$is_chrome = apply_filters( 'use_google_chrome_frame', $is_admin );

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if ( $is_chrome ) {

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header( 'X-UA-Compatible: chrome=1' );

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}

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$is_winIE = ! $is_chrome;

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} else {

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$is_chrome = true;

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}

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} elseif ( stripos( $_SERVER['HTTP_USER_AGENT'], 'safari' ) !== false ) {

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$is_safari = true;

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} elseif ( ( str_contains( $_SERVER['HTTP_USER_AGENT'], 'MSIE' ) || str_contains( $_SERVER['HTTP_USER_AGENT'], 'Trident' ) )

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&& str_contains( $_SERVER['HTTP_USER_AGENT'], 'Win' )

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) {

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$is_winIE = true;

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} elseif ( str_contains( $_SERVER['HTTP_USER_AGENT'], 'MSIE' ) && str_contains( $_SERVER['HTTP_USER_AGENT'], 'Mac' ) ) {

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$is_macIE = true;

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} elseif ( str_contains( $_SERVER['HTTP_USER_AGENT'], 'Gecko' ) ) {

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$is_gecko = true;

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} elseif ( str_contains( $_SERVER['HTTP_USER_AGENT'], 'Nav' ) && str_contains( $_SERVER['HTTP_USER_AGENT'], 'Mozilla/4.' ) ) {

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$is_NS4 = true;

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}

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}

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if ( $is_safari && stripos( $_SERVER['HTTP_USER_AGENT'], 'mobile' ) !== false ) {

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$is_iphone = true;

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}

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

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// Server detection.

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/**

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* Whether the server software is Apache or something else.

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*

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* @global bool $is_apache

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*/

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$is_apache = ( str_contains( $_SERVER['SERVER_SOFTWARE'], 'Apache' ) || str_contains( $_SERVER['SERVER_SOFTWARE'], 'LiteSpeed' ) );

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/**

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* Whether the server software is Nginx or something else.

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*

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* @global bool $is_nginx

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*/

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$is_nginx = ( str_contains( $_SERVER['SERVER_SOFTWARE'], 'nginx' ) );

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/**

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* Whether the server software is Caddy / FrankenPHP or something else.

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*

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* @global bool $is_caddy

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*/

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$is_caddy = ( str_contains( $_SERVER['SERVER_SOFTWARE'], 'Caddy' ) || str_contains( $_SERVER['SERVER_SOFTWARE'], 'FrankenPHP' ) );

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/**

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* Whether the server software is IIS or something else.

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*

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* @global bool $is_IIS

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*/

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$is_IIS = ! $is_apache && ( str_contains( $_SERVER['SERVER_SOFTWARE'], 'Microsoft-IIS' ) || str_contains( $_SERVER['SERVER_SOFTWARE'], 'ExpressionDevServer' ) );

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/**

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* Whether the server software is IIS 7.X or greater.

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*

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* @global bool $is_iis7

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*/

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$is_iis7 = $is_IIS && (int) substr( $_SERVER['SERVER_SOFTWARE'], strpos( $_SERVER['SERVER_SOFTWARE'], 'Microsoft-IIS/' ) + 14 ) >= 7;

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/**

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* Test if the current browser runs on a mobile device (smart phone, tablet, etc.).

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*

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* @since 3.4.0

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* @since 6.4.0 Added checking for the Sec-CH-UA-Mobile request header.

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*

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* @return bool

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*/

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function wp_is_mobile() {

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if ( isset( $_SERVER['HTTP_SEC_CH_UA_MOBILE'] ) ) {

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// This is the `Sec-CH-UA-Mobile` user agent client hint HTTP request header.

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// See <https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Sec-CH-UA-Mobile>.

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$is_mobile = ( '?1' === $_SERVER['HTTP_SEC_CH_UA_MOBILE'] );

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} elseif ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {

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$is_mobile = false;

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} elseif ( str_contains( $_SERVER['HTTP_USER_AGENT'], 'Mobile' ) // Many mobile devices (all iPhone, iPad, etc.)

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|| str_contains( $_SERVER['HTTP_USER_AGENT'], 'Android' )

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|| str_contains( $_SERVER['HTTP_USER_AGENT'], 'Silk/' )

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|| str_contains( $_SERVER['HTTP_USER_AGENT'], 'Kindle' )

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|| str_contains( $_SERVER['HTTP_USER_AGENT'], 'BlackBerry' )

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|| str_contains( $_SERVER['HTTP_USER_AGENT'], 'Opera Mini' )

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|| str_contains( $_SERVER['HTTP_USER_AGENT'], 'Opera Mobi' ) ) {

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$is_mobile = true;

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} else {

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$is_mobile = false;

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}

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/**

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* Filters whether the request should be treated as coming from a mobile device or not.

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*

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* @since 4.9.0

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*

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* @param bool $is_mobile Whether the request is from a mobile device or not.

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*/

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return apply_filters( 'wp_is_mobile', $is_mobile );

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}

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