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📝 Edit File: vars.php

<?php
/**
 * 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://developer.wordpress.org/advanced-administration/server/web-server/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, $is_caddy;

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

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

if ( '' === $pagenow || 'index' === $pagenow || 'index.php' === $pagenow ) {
		$pagenow = 'index.php';
	} else {
		preg_match( '#(.*?)(/|$)#', $pagenow, $self_matches );
		$pagenow = strtolower( $self_matches[1] );
		if ( ! str_ends_with( $pagenow, '.php' ) ) {
			$pagenow .= '.php'; // For `Options +Multiviews`: /wp-admin/themes/index.php (themes.php is queried).
		}
	}
} else {
	if ( preg_match( '#([^/]+\.php)([?/].*?)?$#i', $_SERVER['PHP_SELF'], $self_matches ) ) {
		$pagenow = strtolower( $self_matches[1] );
	} else {
		$pagenow = 'index.php';
	}
}
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['HTTP_USER_AGENT'] ) ) {
	if ( str_contains( $_SERVER['HTTP_USER_AGENT'], 'Lynx' ) ) {
		$is_lynx = true;
	} elseif ( str_contains( $_SERVER['HTTP_USER_AGENT'], 'Edg' ) ) {
		$is_edge = true;
	} elseif ( str_contains( $_SERVER['HTTP_USER_AGENT'], 'Opera' ) || str_contains( $_SERVER['HTTP_USER_AGENT'], 'OPR/' ) ) {
		$is_opera = true;
	} elseif ( stripos( $_SERVER['HTTP_USER_AGENT'], 'chrome' ) !== false ) {
		if ( stripos( $_SERVER['HTTP_USER_AGENT'], 'chromeframe' ) !== 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( 'use_google_chrome_frame', $is_admin );
			if ( $is_chrome ) {
				header( 'X-UA-Compatible: chrome=1' );
			}
			$is_winIE = ! $is_chrome;
		} else {
			$is_chrome = true;
		}
	} elseif ( stripos( $_SERVER['HTTP_USER_AGENT'], 'safari' ) !== false ) {
		$is_safari = true;
	} elseif ( ( str_contains( $_SERVER['HTTP_USER_AGENT'], 'MSIE' ) || str_contains( $_SERVER['HTTP_USER_AGENT'], 'Trident' ) )
		&& str_contains( $_SERVER['HTTP_USER_AGENT'], 'Win' )
	) {
		$is_winIE = true;
	} elseif ( str_contains( $_SERVER['HTTP_USER_AGENT'], 'MSIE' ) && str_contains( $_SERVER['HTTP_USER_AGENT'], 'Mac' ) ) {
		$is_macIE = true;
	} elseif ( str_contains( $_SERVER['HTTP_USER_AGENT'], 'Gecko' ) ) {
		$is_gecko = true;
	} elseif ( str_contains( $_SERVER['HTTP_USER_AGENT'], 'Nav' ) && str_contains( $_SERVER['HTTP_USER_AGENT'], 'Mozilla/4.' ) ) {
		$is_NS4 = true;
	}
}

if ( $is_safari && stripos( $_SERVER['HTTP_USER_AGENT'], 'mobile' ) !== 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 = ( str_contains( $_SERVER['SERVER_SOFTWARE'], 'Apache' ) || str_contains( $_SERVER['SERVER_SOFTWARE'], 'LiteSpeed' ) );

/**
 * Whether the server software is Nginx or something else.
 *
 * @global bool $is_nginx
 */
$is_nginx = ( str_contains( $_SERVER['SERVER_SOFTWARE'], 'nginx' ) );

/**
 * Whether the server software is Caddy / FrankenPHP or something else.
 *
 * @global bool $is_caddy
 */
$is_caddy = ( str_contains( $_SERVER['SERVER_SOFTWARE'], 'Caddy' ) || str_contains( $_SERVER['SERVER_SOFTWARE'], 'FrankenPHP' ) );

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

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

/**
 * Test if the current browser runs on a mobile device (smart phone, tablet, etc.).
 *
 * @since 3.4.0
 * @since 6.4.0 Added checking for the Sec-CH-UA-Mobile request header.
 *
 * @return bool
 */
function wp_is_mobile() {
	if ( isset( $_SERVER['HTTP_SEC_CH_UA_MOBILE'] ) ) {
		// This is the `Sec-CH-UA-Mobile` user agent client hint HTTP request header.
		// See <https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Sec-CH-UA-Mobile>.
		$is_mobile = ( '?1' === $_SERVER['HTTP_SEC_CH_UA_MOBILE'] );
	} elseif ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
		$is_mobile = false;
	} elseif ( str_contains( $_SERVER['HTTP_USER_AGENT'], 'Mobile' ) // Many mobile devices (all iPhone, iPad, etc.)
		|| str_contains( $_SERVER['HTTP_USER_AGENT'], 'Android' )
		|| str_contains( $_SERVER['HTTP_USER_AGENT'], 'Silk/' )
		|| str_contains( $_SERVER['HTTP_USER_AGENT'], 'Kindle' )
		|| str_contains( $_SERVER['HTTP_USER_AGENT'], 'BlackBerry' )
		|| str_contains( $_SERVER['HTTP_USER_AGENT'], 'Opera Mini' )
		|| str_contains( $_SERVER['HTTP_USER_AGENT'], 'Opera Mobi' ) ) {
			$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( 'wp_is_mobile', $is_mobile );
}

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📁	assets
📁	block-bindings
📁	block-patterns
📁	block-supports
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📁	css
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📁	html-api
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📁	IXR
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📁	php-compat
📁	PHPMailer
📁	pomo
📁	Requests
📁	rest-api
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📁	theme-compat
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📄	admin-bar.php
📄	atomlib.php
📄	author-template.php
📄	block-bindings.php
📄	block-editor.php
📄	block-i18n.json
📄	block-patterns.php
📄	block-template-utils.php
📄	block-template.php
📄	blocks.php
📄	bookmark-template.php
📄	bookmark.php
📄	cache-compat.php
📄	cache.php
📄	canonical.php
📄	capabilities.php
📄	category-template.php
📄	category.php
📄	class-avif-info.php
📄	class-feed.php
📄	class-http.php
📄	class-IXR.php
📄	class-json.php
📄	class-oembed.php
📄	class-phpass.php
📄	class-phpmailer.php
📄	class-pop3.php
📄	class-requests.php
📄	class-simplepie.php
📄	class-smtp.php
📄	class-snoopy.php
📄	class-walker-category-dropdown.php
📄	class-walker-category.php
📄	class-walker-comment.php
📄	class-walker-nav-menu.php
📄	class-walker-page-dropdown.php
📄	class-walker-page.php
📄	class-wp-admin-bar.php
📄	class-wp-ajax-response.php
📄	class-wp-application-passwords.php
📄	class-wp-block-bindings-registry.php
📄	class-wp-block-bindings-source.php
📄	class-wp-block-editor-context.php
📄	class-wp-block-list.php
📄	class-wp-block-metadata-registry.php
📄	class-wp-block-parser-block.php
📄	class-wp-block-parser-frame.php
📄	class-wp-block-parser.php
📄	class-wp-block-pattern-categories-registry.php
📄	class-wp-block-patterns-registry.php
📄	class-wp-block-styles-registry.php
📄	class-wp-block-supports.php
📄	class-wp-block-template.php
📄	class-wp-block-templates-registry.php
📄	class-wp-block-type-registry.php
📄	class-wp-block-type.php
📄	class-wp-block.php
📄	class-wp-classic-to-block-menu-converter.php
📄	class-wp-comment-query.php
📄	class-wp-comment.php
📄	class-wp-customize-control.php
📄	class-wp-customize-manager.php
📄	class-wp-customize-nav-menus.php
📄	class-wp-customize-panel.php
📄	class-wp-customize-section.php
📄	class-wp-customize-setting.php
📄	class-wp-customize-widgets.php
📄	class-wp-date-query.php
📄	class-wp-dependencies.php
📄	class-wp-dependency.php
📄	class-wp-duotone.php
📄	class-wp-editor.php
📄	class-wp-embed.php
📄	class-wp-error.php
📄	class-wp-exception.php
📄	class-wp-fatal-error-handler.php
📄	class-wp-feed-cache-transient.php
📄	class-wp-feed-cache.php
📄	class-wp-hook.php
📄	class-wp-http-cookie.php
📄	class-wp-http-curl.php
📄	class-wp-http-encoding.php
📄	class-wp-http-ixr-client.php
📄	class-wp-http-proxy.php
📄	class-wp-http-requests-hooks.php
📄	class-wp-http-requests-response.php
📄	class-wp-http-response.php
📄	class-wp-http-streams.php
📄	class-wp-http.php
📄	class-wp-image-editor-gd.php
📄	class-wp-image-editor-imagick.php
📄	class-wp-image-editor.php
📄	class-wp-list-util.php
📄	class-wp-locale-switcher.php
📄	class-wp-locale.php
📄	class-wp-matchesmapregex.php
📄	class-wp-meta-query.php
📄	class-wp-metadata-lazyloader.php
📄	class-wp-navigation-fallback.php
📄	class-wp-network-query.php
📄	class-wp-network.php
📄	class-wp-object-cache.php
📄	class-wp-oembed-controller.php
📄	class-wp-oembed.php
📄	class-wp-paused-extensions-storage.php
📄	class-wp-plugin-dependencies.php
📄	class-wp-post-type.php
📄	class-wp-post.php
📄	class-wp-query.php
📄	class-wp-recovery-mode-cookie-service.php
📄	class-wp-recovery-mode-email-service.php
📄	class-wp-recovery-mode-key-service.php
📄	class-wp-recovery-mode-link-service.php
📄	class-wp-recovery-mode.php
📄	class-wp-rewrite.php
📄	class-wp-role.php
📄	class-wp-roles.php
📄	class-wp-script-modules.php
📄	class-wp-scripts.php
📄	class-wp-session-tokens.php
📄	class-wp-simplepie-file.php
📄	class-wp-simplepie-sanitize-kses.php
📄	class-wp-site-query.php
📄	class-wp-site.php
📄	class-wp-styles.php
📄	class-wp-tax-query.php
📄	class-wp-taxonomy.php
📄	class-wp-term-query.php
📄	class-wp-term.php
📄	class-wp-text-diff-renderer-inline.php
📄	class-wp-text-diff-renderer-table.php
📄	class-wp-textdomain-registry.php
📄	class-wp-theme-json-data.php
📄	class-wp-theme-json-resolver.php
📄	class-wp-theme-json-schema.php
📄	class-wp-theme-json.php
📄	class-wp-theme.php
📄	class-wp-token-map.php
📄	class-wp-user-meta-session-tokens.php
📄	class-wp-user-query.php
📄	class-wp-user-request.php
📄	class-wp-user.php
📄	class-wp-walker.php
📄	class-wp-widget-factory.php
📄	class-wp-widget.php
📄	class-wp-xmlrpc-server.php
📄	class-wp.php
📄	class-wpdb.php
📄	class.wp-dependencies.php
📄	class.wp-scripts.php
📄	class.wp-styles.php
📄	comment-template.php
📄	comment.php
📄	compat.php
📄	cron.php
📄	date.php
📄	default-constants.php
📄	default-filters.php
📄	default-widgets.php
📄	deprecated.php
📄	embed-template.php
📄	embed.php
📄	error-protection.php
📄	feed-atom-comments.php
📄	feed-atom.php
📄	feed-rdf.php
📄	feed-rss.php
📄	feed-rss2-comments.php
📄	feed-rss2.php
📄	feed.php
📄	fonts.php
📄	formatting.php
📄	functions.php
📄	functions.wp-scripts.php
📄	functions.wp-styles.php
📄	general-template.php
📄	global-styles-and-settings.php
📄	http.php
📄	https-detection.php
📄	https-migration.php
📄	kses.php
📄	l10n.php
📄	link-template.php
📄	load.php
📄	locale.php
📄	media-template.php
📄	media.php
📄	meta.php
📄	ms-blogs.php
📄	ms-default-constants.php
📄	ms-default-filters.php
📄	ms-deprecated.php
📄	ms-files.php
📄	ms-functions.php
📄	ms-load.php
📄	ms-network.php
📄	ms-settings.php
📄	ms-site.php
📄	nav-menu-template.php
📄	nav-menu.php
📄	option.php
📄	pluggable-deprecated.php
📄	pluggable.php
📄	plugin.php
📄	post-formats.php
📄	post-template.php
📄	post-thumbnail-template.php
📄	post.php
📄	query.php
📄	registration-functions.php
📄	registration.php
📄	rest-api.php
📄	revision.php
📄	rewrite.php
📄	robots-template.php
📄	rss-functions.php
📄	rss.php
📄	script-loader.php
📄	script-modules.php
📄	session.php
📄	shortcodes.php
📄	sitemaps.php
📄	spl-autoload-compat.php
📄	style-engine.php
📄	taxonomy.php
📄	template-canvas.php
📄	template-loader.php
📄	template.php
📄	theme-i18n.json
📄	theme-previews.php
📄	theme-templates.php
📄	theme.json
📄	theme.php
📄	update.php
📄	user.php
📄	vars.php
📄	version.php
📄	widgets.php
📄	wp-db.php
📄	wp-diff.php