Requests::decode_chunked( string $data ): string

854	protected static function decode_chunked($data) {855		if (!preg_match('/^([0-9a-f]+)(?:;(?:[\w-]*)(?:=(?:(?:[\w-]*)*|"(?:[^\r\n])*"))?)*\r\n/i', trim($data))) {856			return $data;857		}858 859		$decoded = '';860		$encoded = $data;861 862		while (true) {863			$is_chunked = (bool) preg_match('/^([0-9a-f]+)(?:;(?:[\w-]*)(?:=(?:(?:[\w-]*)*|"(?:[^\r\n])*"))?)*\r\n/i', $encoded, $matches);864			if (!$is_chunked) {865				// Looks like it's not chunked after all866				return $data;867			}868 869			$length = hexdec(trim($matches[1]));870			if ($length === 0) {871				// Ignore trailer headers872				return $decoded;873			}874 875			$chunk_length = strlen($matches[0]);876			$decoded     .= substr($encoded, $chunk_length, $length);877			$encoded      = substr($encoded, $chunk_length + $length + 2);878 879			if (trim($encoded) === '0' || empty($encoded)) {880				return $decoded;881			}882		}883 884		// We'll never actually get down here885		// @codeCoverageIgnoreStart886	}