<?php
$array = array('45','50', '3', '4444');

foreach($array as &$irt){
    $irt = 150;
}

var_dump($array);

array(4) {
  [0]=>
  int(150)
  [1]=>
  int(150)
  [2]=>
  int(150)
  [3]=>
  &int(150)
}