测试ID不在（n，n1，n2）

Question

Given a value, #some_id = x, what's the proper syntax or method to test that the id does not exist in a collection of id's?

For example...

if($some_id not in array(3, 5, 9)){
  //do something
}

Answer 1

$theArray = array(3, 5, 9);

if(! in_array($x, $theArray)){
    // do something
}

http://php.net/manual/en/function.in-array.php