(PHP 5 >= 5.3.0)
json_last_error — Returns the last error occurred
Returns the last error (if any) occurred by last JSON parsing.
此函数没有参数。
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_CTRL_CHAR | Control character error, possibly incorrectly encoded | |
| JSON_ERROR_STATE_MISMATCH | Invalid or malformed JSON | |
| JSON_ERROR_SYNTAX | Syntax error | |
| JSON_ERROR_UTF8 | Malformed UTF-8 characters, possibly incorrectly encoded | PHP 5.3.3 |
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_DEPTH:
echo ' - Maximum stack depth exceeded';
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_NONE:
echo ' - No errors';
break;
}
echo PHP_EOL;
}
?>
以上例程会输出：
Decoding: {"Organization": "PHP Documentation Team"} - No errors
Decoding: {'Organization': 'PHP Documentation Team'} - Syntax error, malformed JSON