json_last_error_msg
Judy
JSON Functions
PHP Manual

# json_last_error

(PHP 5 >= 5.3.0)

json_last_error — Returns the last error occurred

### Description

int json_last_error ( void )

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

### 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 | 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

Example #1 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

Example #2 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() - Returns the error string of the last json_encode() or json_decode() call
- json_decode() - Decodes a JSON string
- json_encode() - Returns the JSON representation of a value

json_last_error_msg
Judy
JSON Functions
PHP Manual