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JSON Functions
PHP Manual

json_last_error

(PHP 5 >= 5.3.0)

json_last_errorReturns the last error occurred

Description

int json_last_error ( void )

Returns the last error (if any) occurred by last JSON parsing.

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
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

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_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;
}
?>

The above example will output:

Decoding: {"Organization": "PHP Documentation Team"} - No errors
Decoding: {'Organization': 'PHP Documentation Team'} - Syntax error, malformed JSON

See Also


JSON Functions
PHP Manual

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