PHP Array_diff Usage

What should we do if we want to get rid of 1 and 22 values in array a? One of the traditional methods is to iterate over an array, if the value equals 1, or wait for 2, we'll remove the element, obviously troublesome, and now it's different, we can write
First, we make an array of the values we don't need,

          
              
$del =array ();
          

And then we'll take advantage of our protagonist Array_diff function.

          
              
$d =array_diff ($a, $del); Var_dump ($d);
          

The results of PHP execution will be what we dream of:

          
              
Array (1) {  [2]=>  int (3)}
          

