<?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 current page. Checks

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* 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://wordpress.org/support/article/nginx/

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*

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* @package WordPress

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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;

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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 = $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 ( '.php' !== substr( $pagenow, -4, 4 ) ) {

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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 ( strpos( $_SERVER['HTTP_USER_AGENT'], 'Lynx' ) !== false ) {

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$is_lynx = true;

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} elseif ( strpos( $_SERVER['HTTP_USER_AGENT'], 'Edge' ) !== false ) {

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$is_edge = 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 ( ( strpos( $_SERVER['HTTP_USER_AGENT'], 'MSIE' ) !== false || strpos( $_SERVER['HTTP_USER_AGENT'], 'Trident' ) !== false ) && strpos( $_SERVER['HTTP_USER_AGENT'], 'Win' ) !== false ) {

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$is_winIE = true;

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} elseif ( strpos( $_SERVER['HTTP_USER_AGENT'], 'MSIE' ) !== false && strpos( $_SERVER['HTTP_USER_AGENT'], 'Mac' ) !== false ) {

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$is_macIE = true;

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} elseif ( strpos( $_SERVER['HTTP_USER_AGENT'], 'Gecko' ) !== false ) {

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$is_gecko = true;

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} elseif ( strpos( $_SERVER['HTTP_USER_AGENT'], 'Opera' ) !== false ) {

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$is_opera = true;

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} elseif ( strpos( $_SERVER['HTTP_USER_AGENT'], 'Nav' ) !== false && strpos( $_SERVER['HTTP_USER_AGENT'], 'Mozilla/4.' ) !== false ) {

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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 = ( strpos( $_SERVER['SERVER_SOFTWARE'], 'Apache' ) !== false || strpos( $_SERVER['SERVER_SOFTWARE'], 'LiteSpeed' ) !== false );

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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 = ( strpos( $_SERVER['SERVER_SOFTWARE'], 'nginx' ) !== false );

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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 && ( strpos( $_SERVER['SERVER_SOFTWARE'], 'Microsoft-IIS' ) !== false || strpos( $_SERVER['SERVER_SOFTWARE'], 'ExpressionDevServer' ) !== false );

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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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*

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* @return bool

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*/

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function wp_is_mobile() {

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

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$is_mobile = false;

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

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|| strpos( $_SERVER['HTTP_USER_AGENT'], 'Android' ) !== false

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|| strpos( $_SERVER['HTTP_USER_AGENT'], 'Silk/' ) !== false

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|| strpos( $_SERVER['HTTP_USER_AGENT'], 'Kindle' ) !== false

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|| strpos( $_SERVER['HTTP_USER_AGENT'], 'BlackBerry' ) !== false

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|| strpos( $_SERVER['HTTP_USER_AGENT'], 'Opera Mini' ) !== false

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|| strpos( $_SERVER['HTTP_USER_AGENT'], 'Opera Mobi' ) !== false ) {

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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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