json_encode
While this can obviously change between versions, the current error codes are as follows:
0 = JSON_ERROR_NONE
1 = JSON_ERROR_DEPTH
2 = JSON_ERROR_STATE_MISMATCH
3 = JSON_ERROR_CTRL_CHAR
4 = JSON_ERROR_SYNTAX
5 = JSON_ERROR_UTF8
I'm only posting these for people who may be trying to understand why specific JSON files are not being decoded. Please do not hard-code these numbers into an error handler routine.
json_last_error
(PHP 5 >= 5.3.0)
json_last_error — Returns the last error occurred
Описание
int json_last_error
( void
)
Returns the last error (if any) occurred by last JSON parsing.
Параметри
Тази функция няма параметри.
Връщани стойности
Returns an integer, the value can be one of the following constants:
| Constant | Meaning |
|---|---|
| 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_SYNTAX | Syntax error |
Примери
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;
}
?>
Примерът по-горе ще изведе:
Decoding: {"Organization": "PHP Documentation Team"} - No errors
Decoding: {'Organization': 'PHP Documentation Team'} - Syntax error, malformed JSON
add a note
User Contributed Notes
json_last_error
jimmetry at gmail dot com
23-Nov-2011 09:16
lior at mytopia dot com
09-Mar-2009 05:17
For those of you who prefer a more object oriented approach (as I do), here is a fairly simple wrapper that handles errors using exceptions:
<?php
class JSON
{
public static function Encode($obj)
{
return json_encode($obj);
}
public static function Decode($json, $toAssoc = false)
{
$result = json_decode($json, $toAssoc);
switch(json_last_error())
{
case JSON_ERROR_DEPTH:
$error = ' - Maximum stack depth exceeded';
break;
case JSON_ERROR_CTRL_CHAR:
$error = ' - Unexpected control character found';
break;
case JSON_ERROR_SYNTAX:
$error = ' - Syntax error, malformed JSON';
break;
case JSON_ERROR_NONE:
default:
$error = '';
}
if (!empty($error))
throw new Exception('JSON Error: '.$error);
return $result;
}
}
?>