json_last_error

PHP 5 >= 5.3.0, PHP 7, PHP 8

json_last_error - Returns the last error occurred

Manual

json_last_error( ): int

Returns the last error (if any) occurred during the last JSON encoding/decoding, which did not specify JSON_THROW_ON_ERROR.

Parameters

This function has no parameters.

Return Values

Returns an integer, the value can be one of the following constants:

JSON error codes

Constant	Meaning	Availability
JSON_ERROR_NONE	No error has occurred
JSON_ERROR_DEPTH	The maximum stack depth has been exceeded
JSON_ERROR_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
JSON_ERROR_RECURSION	One or more recursive references in the value to be encoded
JSON_ERROR_INF_OR_NAN	One or more NAN or INF values in the value to be encoded
JSON_ERROR_UNSUPPORTED_TYPE	A value of a type that cannot be encoded was given
JSON_ERROR_INVALID_PROPERTY_NAME	A property name that cannot be encoded was given
JSON_ERROR_UTF16	Malformed UTF-16 characters, possibly incorrectly encoded

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Example of json_last_error

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<?php
// A valid json string
$json[] = '{"Organization": "PHP Documentation Team"}';
// An invalid json string which will cause an syntax 
// error, in this case we used ' instead of " for quotation
$json[] = "{'Organization': 'PHP Documentation Team'}";
foreach ($json as $string) {
    echo 'Decoding: ' . $string;
    json_decode($string);
    switch (json_last_error()) {
        case JSON_ERROR_NONE:
            echo ' - No errors';
        break;
        case JSON_ERROR_DEPTH:
            echo ' - Maximum stack depth exceeded';
        break;
        case JSON_ERROR_STATE_MISMATCH:
            echo ' - Underflow or the modes mismatch';
        break;
        case JSON_ERROR_CTRL_CHAR:
            echo ' - Unexpected control character found';
        break;
        case JSON_ERROR_SYNTAX:
            echo ' - Syntax error, malformed JSON';
        break;
        case JSON_ERROR_UTF8:
            echo ' - Malformed UTF-8 characters, possibly incorrectly encoded';
        break;
        default:
            echo ' - Unknown error';
        break;
    }
    echo PHP_EOL;
}

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json_last_error

Parameters

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Example of json_last_error

Function json_last_error:

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