IXR_Message

10class IXR_Message11{12    var $message     = false;13    var $messageType = false;  // methodCall / methodResponse / fault14    var $faultCode   = false;15    var $faultString = false;16    var $methodName  = '';17    var $params      = array();18 19    // Current variable stacks20    var $_arraystructs = array();   // The stack used to keep track of the current array/struct21    var $_arraystructstypes = array(); // Stack keeping track of if things are structs or array22    var $_currentStructName = array();  // A stack as well23    var $_param;24    var $_value;25    var $_currentTag;26    var $_currentTagContents;27    // The XML parser28    var $_parser;29 30	/**31	 * PHP5 constructor.32	 */33    function __construct( $message )34    {35        $this->message =& $message;36    }37 38	/**39	 * PHP4 constructor.40	 */41	public function IXR_Message( $message ) {42		self::__construct( $message );43	}44 45    function parse()46    {47        if ( ! function_exists( 'xml_parser_create' ) ) {48            trigger_error( __( "PHP's XML extension is not available. Please contact your hosting provider to enable PHP's XML extension." ) );49            return false;50        }51 52        // first remove the XML declaration53        // merged from WP #10698 - this method avoids the RAM usage of preg_replace on very large messages54        $header = preg_replace( '/<\?xml.*?\?'.'>/s', '', substr( $this->message, 0, 100 ), 1 );55        $this->message = trim( substr_replace( $this->message, $header, 0, 100 ) );56        if ( '' == $this->message ) {57            return false;58        }59 60        // Then remove the DOCTYPE61        $header = preg_replace( '/^<!DOCTYPE[^>]*+>/i', '', substr( $this->message, 0, 200 ), 1 );62        $this->message = trim( substr_replace( $this->message, $header, 0, 200 ) );63        if ( '' == $this->message ) {64            return false;65        }66 67        // Check that the root tag is valid68        $root_tag = substr( $this->message, 0, strcspn( substr( $this->message, 0, 20 ), "> \t\r\n" ) );69        if ( '<!DOCTYPE' === strtoupper( $root_tag ) ) {70            return false;71        }72        if ( ! in_array( $root_tag, array( '<methodCall', '<methodResponse', '<fault' ) ) ) {73            return false;74        }75 76        // Bail if there are too many elements to parse77        $element_limit = 30000;78        if ( function_exists( 'apply_filters' ) ) {79            /**80             * Filters the number of elements to parse in an XML-RPC response.81             *82             * @since 4.0.083             *84             * @param int $element_limit Default elements limit.85             */86            $element_limit = apply_filters( 'xmlrpc_element_limit', $element_limit );87        }88        if ( $element_limit && 2 * $element_limit < substr_count( $this->message, '<' ) ) {89            return false;