php add array element to beginning code example

Example 1: php add element to array first position

<?php
$queue = array("orange", "banana");
array_unshift($queue, "apple", "raspberry");
print_r($queue);
?>
  Array
(
    [0] => apple
    [1] => raspberry
    [2] => orange
    [3] => banana
)

Example 2: php add element to beginning of associative array

$arr1 = array('key0' => 'value0') + $arr1;

-------------- OR ------------------

<?php
$arr = array('key1' => 'value1', 'key2' => 'value2');
$arr = array_merge(array('key0' => 'value0'), $arr);