How to merge arrays in php without overwriting duplicate values

How to implement php merging arrays without overwriting: first create a PHP sample file; then define two sets of arrays; then merge the arrays through the "$form_data1 $form_data2;" method; and finally output the merged value.

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Method to merge arrays and retain key values:

<?php
$form_data1 = array(11=>&#39;A&#39;,12=>&#39;B&#39;,13=>&#39;C&#39;,14=>&#39;D&#39;);
$form_data2 = array(25=>&#39;B&#39;,26=>&#39;A&#39;,27=>&#39;D&#39;,28=>&#39;C&#39;);
$result = $form_data1 + $form_data2;
print_r($result);
?>

Output:

Array
(
    [11] => A
    [12] => B
    [13] => C
    [14] => D
    [25] => B
    [26] => A
    [27] => D
    [28] => C
)

Use the " " operator to merge arrays to retain the key values ​​of the array. If the merged array contains the same key value, the later ones will not overwrite the previous ones. The key value (the first one takes precedence).

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