<?php /** * Check the string is json * * @param string $str * @return bool * @throws Exception if the string is not json */ function isJson ( $str ) { json_decode ( $str ); $code = json_last_error (); switch ( $code ) { case JSON_ERROR_NONE: return true ; case JSON_ERROR_DEPTH: throw new Exception( "Maximum stack depth exceeded" ); case JSON_ERROR_STATE_MISMATCH: throw new Exception( "Underflow or the modes mismatch" ); case JSON_ERROR_CTRL_CHAR: throw new Exception( "Unexpected control character found" ); case JSON_ERROR_SYNTAX: throw new Exception( "Syntax error, malformed JSON" ); case JSON_ERROR_UTF8: throw new Exception( "Malformed UTF-8 characters, possibly incorrectly encoded" ); default : throw new Exception( "U...