<?php

/**

 * Creates common globals for the rest of WordPress

 *

 * Sets $pagenow global which is the current page. 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://codex.wordpress.org/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

	$pagenow = $self_matches[1];

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

		$pagenow = 'index.php';

	} else {

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

	}

} else {

		$pagenow = 'index.php';

}

// Simple browser detection

$is_lynx = $is_gecko = $is_winIE = $is_macIE = $is_opera = $is_NS4 = $is_safari = $is_chrome = $is_iphone = $is_edge = false;

		$is_lynx = true;

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

		$is_edge = true;

		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().

			 */

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

			$is_winIE = ! $is_chrome;

		} else {

			$is_chrome = true;

		}

		$is_safari = true;

		$is_winIE = true;

		$is_macIE = true;

		$is_gecko = true;

		$is_opera = true;

		$is_NS4 = true;

	}

}

	$is_iphone = true;

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

// Server detection

/**

 * Whether the server software is Apache or something else

 * @global bool $is_apache

 */

/**

 * Whether the server software is Nginx or something else

 * @global bool $is_nginx

 */

/**

 * Whether the server software is IIS or something else

 * @global bool $is_IIS

 */

/**

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

 * @global bool $is_iis7

 */

$is_iis7 = $is_IIS && intval( 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

 * @return bool

 */

function wp_is_mobile() {

		$is_mobile = 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( 'wp_is_mobile', $is_mobile );

}