json_last_error
(PHP 5 >= 5.3.0, PHP 7)
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:
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 |
JSON_ERROR_INVALID_PROPERTY_NAME | A property name that cannot be encoded was given | PHP 7.0.0 |
JSON_ERROR_UTF16 | Malformed UTF-16 characters, possibly incorrectly encoded | PHP 7.0.0 |
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 JSONExample #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
? 1997–2017 The PHP Documentation GroupLicensed under the Creative Commons Attribution License v3.0 or later.
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