Question

when i am using extract it shows some warnings like ‘PHP Warning: extract() [function.extract]: First argument should be an array ‘

following is the code

$HTTP_RAW_POST_DATA = file_get_contents('php://input');

ob_start();

global $mmb_core;
$data = unserialize(base64_decode($HTTP_RAW_POST_DATA));
$data =array($data);
$num  = extract($data);

Answer 1

1. First of all, you either don’t need line $data =array($data); or don’t need to unserialize. Which one depends on the format of input. If input is serialized array, then it is enough to only unserialize it.

2. You need to make sure that $data is an associative array. Means that EACH element in it has a string key and that key fits in variable naming rules (e.g. does not start with number). If it is array, but not an associative array, this error will be produced.

Also this function validates whether these keys will overwrite already defined variables. So you need to use proper keys. I would use it this way

if(is_array($data)){
  $num = extract($data, EXTR_PREFIX_ALL, "data_");
}

That will prepend each key with data_. Also will work for not associative arrays making variables like $data_0, $data_1 etc.

For more details you better refer to official documentation