+ /**
+ * A wrapper for PHP's parse_url() function that handles edgecases in < PHP 5.4.7
+ *
+ * PHP 5.4.7 expanded parse_url()'s ability to handle non-absolute url's, including
+ * schemeless and relative url's with :// in the path, this works around those
+ * limitations providing a standard output on PHP 5.2~5.4+.
+ *
+ * Error suppression is used as prior to PHP 5.3.3, an E_WARNING would be generated
+ * when URL parsing failed.
+ *
+ * @since 4.1.0
+ *
+ * @static
+ * @access protected
+ *
+ * @param string $url The URL to parse.
+ * @return bool|array False on failure; Array of URL components on success;
+ * See parse_url()'s return values.
+ */
+ protected static function parse_url( $url ) {
+ $parts = @parse_url( $url );
+ if ( ! $parts ) {
+ // < PHP 5.4.7 compat, trouble with relative paths including a scheme break in the path
+ if ( '/' == $url[0] && false !== strpos( $url, '://' ) ) {
+ // Since we know it's a relative path, prefix with a scheme/host placeholder and try again
+ if ( ! $parts = @parse_url( 'placeholder://placeholder' . $url ) ) {
+ return $parts;
+ }
+ // Remove the placeholder values
+ unset( $parts['scheme'], $parts['host'] );
+ } else {
+ return $parts;
+ }
+ }
+
+ // < PHP 5.4.7 compat, doesn't detect schemeless URL's host field
+ if ( '//' == substr( $url, 0, 2 ) && ! isset( $parts['host'] ) ) {
+ list( $parts['host'], $slashless_path ) = explode( '/', substr( $parts['path'], 2 ), 2 );
+ $parts['path'] = "/{$slashless_path}";
+ }
+
+ return $parts;
+ }
+
+ /**
+ * Converts a relative URL to an absolute URL relative to a given URL.
+ *
+ * If an Absolute URL is provided, no processing of that URL is done.
+ *
+ * @since 3.4.0
+ *
+ * @static
+ * @access public
+ *
+ * @param string $maybe_relative_path The URL which might be relative
+ * @param string $url The URL which $maybe_relative_path is relative to
+ * @return string An Absolute URL, in a failure condition where the URL cannot be parsed, the relative URL will be returned.
+ */