how to add a key and value to an array in php code example

Example 1: array_push

$array[$key] = $value;
// or
$array[] = $value;
// or
array_push($array, [ mixed $... ]);

Example 2: php add item to array

<?php
  $z = ['me','you', 'he'];
  array_push($z, 'she', 'it');
  print_r($z);
?>