json_last_error

(PHP 5 >= 5.3.0, PHP 7)
Returns the last error occurred
int json_last_error ( void )

Returns the last error (if any) occurred during the last JSON encoding/decoding.

Returns:

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 PHP 5.3.3
JSON_ERROR_RECURSION One or more recursive references in the value to be encoded PHP 5.5.0
JSON_ERROR_INF_OR_NAN One or more NAN or INF values in the value to be encoded PHP 5.5.0
JSON_ERROR_UNSUPPORTED_TYPE A value of a type that cannot be encoded was given PHP 5.5.0
Examples:
json_last_error() example
<?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;
}
?>

The above example will output:

Decoding: {"Organization": "PHP Documentation Team"} - No errors
Decoding: {'Organization': 'PHP Documentation Team'} - Syntax error, malformed JSON
json_last_error() with json_encode()
<?php
// An invalid UTF8 sequence
$text = "\xB1\x31";

$json  = json_encode($text);
$error = json_last_error();

var_dump($json, $error === JSON_ERROR_UTF8);
?>

The above example will output:

string(4) "null"
bool(true)
See also:

json_last_error_msg() -

json_decode() -

json_encode() -

doc_php
2016-02-24 16:06:06
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