How to add prefix to each key of PHP array?

When you need to add a character or multiple characters to each key of an array, most people prefer to use a for loop or foreach loop to add keys. But we can do it without any loops. Then we mainly add a prefix to each key of the array by using the array_combine(), array_keys() and array_map() functions.

In the example below you can see how to use these functions together and add the prefix to each key in a faster way:

The code example is as follows:

<?php
$myArray = [&#39;0&#39;=>&#39;Hi&#39;,&#39;1&#39;=>&#39;Hello&#39;,&#39;2&#39;=>&#39;Hey&#39;];
$myNewArray = array_combine(
array_map(function($key){ return &#39;a&#39;.$key; }, array_keys($myArray)),
$myArray
);
print_r($myNewArray);

Output:

Array
(
[a0] => Hi
[a1] => Hello
[a2] => Hey
)

Related function introduction:

array_combine() function creates an array, using the value of an array as its key name, the value of another array as its value.

array_keys() function returns some or all of the key names in the array.

The array_map() function applies a callback function to each element of the array.

This article is about adding a prefix to each key in a PHP array. I hope it will be helpful to friends in need!

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