PHP json_last_error() function
In this page you will learn about PHP json_last_error() function with examples.
Description
While working on encoding or decoding JSON, if an error occur, json_last_error() function returns the last error.
PHP version
PHP 5 >= 5.3.0
Syntax
json_last_error ()
Parameters
json_last_error() function does not have any parameters.
Return values
json_last_error() function returns an integer.
The following table shows the values which are CONSTANTS :
| Constants | Description |
|---|---|
| JSON_ERROR_NONE | Specifies that no error occurred. |
| JSON_ERROR_DEPTH | Specifies that the maximum stack depth has been exceeded. |
| JSON_ERROR_STATE_MISMATCH | Indicates that the associated JSON is not properly formed or invalid. |
| JSON_ERROR_CTRL_CHAR | Indicates that the error is in control characters. This usually happens incorrect encoding. |
| JSON_ERROR_SYNTAX | Indicates that this is a syntax error. |
| JSON_ERROR_UTF8 | Indicates that error occurred due to malformed UTF-8 characters, which usually happens because of incorrect encoding. |
json_last_error() example
<?php
$w3r_json[] = "{'Website': 'w3resource.com'}";
//since we have used "'" instead of double quote (""), it is a syntax error.
foreach ($w3r_json as $w3r_string) {
json_decode($w3r_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;
}
?>
//since we have used "'" instead of double quote (""), it is a syntax error.
foreach ($w3r_json as $w3r_string) {
json_decode($w3r_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;
}
?>
Output of the above example
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