PHP 7.0.6 Released

    json_last_error_msg

    (PHP 5 >= 5.5.0, PHP 7)

    json_last_error_msg — Returns the error string of the last json_encode() or json_decode() call

    Description

    string json_last_error_msg ( void )

    Parameters

    This function has no parameters.

    Return Values

    Returns the error message on success, "No Error" if no error has occurred, or FALSE on failure.

    See Also

    User Contributed Notes

    Anonymous
    10 months ago
    Here's an updated version of the function:

    <?php
            if (!function_exists('json_last_error_msg')) {
            function     json_last_error_msg() {
                static     $ERRORS = array(
                        JSON_ERROR_NONE => 'No error',
                        JSON_ERROR_DEPTH => 'Maximum stack depth exceeded',
                        JSON_ERROR_STATE_MISMATCH => 'State mismatch (invalid or malformed JSON)',
                        JSON_ERROR_CTRL_CHAR => 'Control character error, possibly incorrectly encoded',
                        JSON_ERROR_SYNTAX => 'Syntax error',
                        JSON_ERROR_UTF8 => 'Malformed UTF-8 characters, possibly incorrectly encoded'
                    );

                    $error = json_last_error();
                return isset(    $ERRORS[$error]) ? $ERRORS[$error] : 'Unknown error';
            }
        }
    ?>
    seregynp at gmail dot com
    2 years ago
    Watch out !

    In case no error occurred, 'No error' still returned !

    So when upgrading to php 5.5, unexpected behavior can be:

    <?php
    if ($error = json_last_error_msg()) {
       throw new \    LogicException(sprintf("Failed to parse json string '%s', error: '%s'", $this->data, $error));
    }

    // in php 5.5 exception will be thrown, while as in older version not
    ?>
    Ess
    2 years ago
    If function not exists

    <?php
    if (!function_exists('json_last_error_msg'))
        function     json_last_error_msg()
        {
            switch (    json_last_error()) {
                default:
                    return;
                case     JSON_ERROR_DEPTH:
                        $error = 'Maximum stack depth exceeded';
                break;
                case     JSON_ERROR_STATE_MISMATCH:
                        $error = 'Underflow or the modes mismatch';
                break;
                case     JSON_ERROR_CTRL_CHAR:
                        $error = 'Unexpected control character found';
                break;
                case     JSON_ERROR_SYNTAX:
                        $error = 'Syntax error, malformed JSON';
                break;
                case     JSON_ERROR_UTF8:
                        $error = 'Malformed UTF-8 characters, possibly incorrectly encoded';
                break;
            }
            throw new     Exception($error);
        }
    ?>
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