<?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 and IIS. Two web servers

 * with known permalink capability.

 *

 * @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_apache, $is_IIS, $is_iis7;

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

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

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

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

		$is_lynx = true;

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

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

			$is_admin = is_admin();

			/**

			 * Filter 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().

			 */

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

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

		$is_winIE = true;

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

		$is_macIE = true;

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

		$is_gecko = true;

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

		$is_opera = true;

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

		$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

 */

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

/**

 * Whether the server software is Nginx or something else

 * @global bool $is_nginx

 */

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

/**

 * Whether the server software is IIS or something else

 * @global bool $is_IIS

 */

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

/**

 * 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.)

 *

 * @return bool true|false

 */

function wp_is_mobile() {

	static $is_mobile;

	if ( isset($is_mobile) )

		return $is_mobile;

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

		$is_mobile = false;

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

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

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

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

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

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

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

			$is_mobile = true;

	} else {

		$is_mobile = false;

	}

	return $is_mobile;

}