json_last_error

PHP 5 >= 5.3.0, PHP 7, PHP 8

json_last_error - Returns the last error occurred

Code Examples

Example #1 json_last_error example

Result: Decoding: {"Organization": "PHP Documentation Team"} - No errors Decoding: {'Organization': 'PHP Documentation Team'} - Syntax error, malformed JSON

<?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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Example #2 json_last_error with json_encode

Result: string(4) "null" bool(true)

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Example #3 json_last_error and <span class='function-constant'>JSON_THROW_ON_ERROR</span>

Result: bool(true)

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json_last_error

Example #1 json_last_error example

Example #2 json_last_error with json_encode

Example #3 json_last_error and <span class='function-constant'>JSON_THROW_ON_ERROR</span>

Function json_last_error:

JavaScript Object Notation Functions

Most used PHP functions