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Filename : php-compatibility.func.php
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<?php
/**
 * LiteSpeed PHP compatibility functions for lower PHP version
 *
 * @since      1.1.3
 * @package    LiteSpeed_Cache
 * @subpackage LiteSpeed_Cache/lib
 * @author     LiteSpeed Technologies <info@litespeedtech.com>
 */

defined( 'WPINC' ) || exit ;


/**
 * http_build_url() compatibility
 *
 */
if ( ! function_exists('http_build_url') ) {
	if ( ! defined( 'HTTP_URL_REPLACE' ) ) 			define('HTTP_URL_REPLACE', 1);              // Replace every part of the first URL when there's one of the second URL
	if ( ! defined( 'HTTP_URL_JOIN_PATH' ) ) 		define('HTTP_URL_JOIN_PATH', 2);            // Join relative paths
	if ( ! defined( 'HTTP_URL_JOIN_QUERY' ) ) 		define('HTTP_URL_JOIN_QUERY', 4);           // Join query strings
	if ( ! defined( 'HTTP_URL_STRIP_USER' ) ) 		define('HTTP_URL_STRIP_USER', 8);           // Strip any user authentication information
	if ( ! defined( 'HTTP_URL_STRIP_PASS' ) ) 		define('HTTP_URL_STRIP_PASS', 16);          // Strip any password authentication information
	if ( ! defined( 'HTTP_URL_STRIP_AUTH' ) ) 		define('HTTP_URL_STRIP_AUTH', 32);          // Strip any authentication information
	if ( ! defined( 'HTTP_URL_STRIP_PORT' ) ) 		define('HTTP_URL_STRIP_PORT', 64);          // Strip explicit port numbers
	if ( ! defined( 'HTTP_URL_STRIP_PATH' ) ) 		define('HTTP_URL_STRIP_PATH', 128);         // Strip complete path
	if ( ! defined( 'HTTP_URL_STRIP_QUERY' ) ) 		define('HTTP_URL_STRIP_QUERY', 256);        // Strip query string
	if ( ! defined( 'HTTP_URL_STRIP_FRAGMENT' ) ) 	define('HTTP_URL_STRIP_FRAGMENT', 512);     // Strip any fragments (#identifier)
	if ( ! defined( 'HTTP_URL_STRIP_ALL' ) ) 		define('HTTP_URL_STRIP_ALL', 1024);         // Strip anything but scheme and host

	// Build an URL
	// The parts of the second URL will be merged into the first according to the flags argument.
	//
	// @param   mixed           (Part(s) of) an URL in form of a string or associative array like parse_url() returns
	// @param   mixed           Same as the first argument
	// @param   int             A bitmask of binary or'ed HTTP_URL constants (Optional)HTTP_URL_REPLACE is the default
	// @param   array           If set, it will be filled with the parts of the composed url like parse_url() would return
	function http_build_url($url, $parts = array(), $flags = HTTP_URL_REPLACE, &$new_url = false)
	{
		$keys = array('user','pass','port','path','query','fragment');

		// HTTP_URL_STRIP_ALL becomes all the HTTP_URL_STRIP_Xs
		if ( $flags & HTTP_URL_STRIP_ALL ) {
			$flags |= HTTP_URL_STRIP_USER;
			$flags |= HTTP_URL_STRIP_PASS;
			$flags |= HTTP_URL_STRIP_PORT;
			$flags |= HTTP_URL_STRIP_PATH;
			$flags |= HTTP_URL_STRIP_QUERY;
			$flags |= HTTP_URL_STRIP_FRAGMENT;
		}
		// HTTP_URL_STRIP_AUTH becomes HTTP_URL_STRIP_USER and HTTP_URL_STRIP_PASS
		else if ( $flags & HTTP_URL_STRIP_AUTH ) {
			$flags |= HTTP_URL_STRIP_USER;
			$flags |= HTTP_URL_STRIP_PASS;
		}

		// Parse the original URL
		// - Suggestion by Sayed Ahad Abbas
		//   In case you send a parse_url array as input
		$parse_url = !is_array($url) ? parse_url($url) : $url;

		// Scheme and Host are always replaced
		if ( isset($parts['scheme']) ) {
			$parse_url['scheme'] = $parts['scheme'];
		}
		if ( isset($parts['host']) ) {
			$parse_url['host'] = $parts['host'];
		}

		// (If applicable) Replace the original URL with it's new parts
		if ( $flags & HTTP_URL_REPLACE ) {
			foreach ($keys as $key) {
				if ( isset($parts[$key]) ) {
					$parse_url[$key] = $parts[$key];
				}
			}
		}
		else {
			// Join the original URL path with the new path
			if (isset($parts['path']) && ($flags & HTTP_URL_JOIN_PATH)) {
				if ( isset($parse_url['path']) ) {
					$parse_url['path'] = rtrim(str_replace(basename($parse_url['path']), '', $parse_url['path']), '/') . '/' . ltrim($parts['path'], '/');
				}
				else {
					$parse_url['path'] = $parts['path'];
				}
			}

			// Join the original query string with the new query string
			if ( isset($parts['query']) && ($flags & HTTP_URL_JOIN_QUERY) ) {
				if ( isset($parse_url['query']) ) {
					$parse_url['query'] .= '&' . $parts['query'];
				}
				else {
					$parse_url['query'] = $parts['query'];
				}
			}
		}

		// Strips all the applicable sections of the URL
		// Note: Scheme and Host are never stripped
		foreach ($keys as $key) {
			if ( $flags & (int)constant('HTTP_URL_STRIP_' . strtoupper($key)) ) {
				unset($parse_url[$key]);
			}
		}

		$new_url = $parse_url;

		return
			 (isset($parse_url['scheme']) ? $parse_url['scheme'] . '://' : '')
			.(isset($parse_url['user']) ? $parse_url['user'] . (isset($parse_url['pass']) ? ':' . $parse_url['pass'] : '') .'@' : '')
			.(isset($parse_url['host']) ? $parse_url['host'] : '')
			.(isset($parse_url['port']) ? ':' . $parse_url['port'] : '')
			.(isset($parse_url['path']) ? $parse_url['path'] : '')
			.(isset($parse_url['query']) ? '?' . $parse_url['query'] : '')
			.(isset($parse_url['fragment']) ? '#' . $parse_url['fragment'] : '')
		;
	}
}


if ( ! function_exists( 'array_key_first' ) ) {
	function array_key_first( array $arr ) {
		foreach( $arr as $k => $unused ) {
			return $k ;
		}
		return NULL ;
	}
}

if ( ! function_exists( 'array_column' ) ) {
	function array_column( $array, $column_name )
	{
		return array_map( function( $element ) use( $column_name ) { return $element[ $column_name ]; }, $array );
	}
}