Using array_fill_keys() to Fill an Array with Specified Keys and Values in PHP

The article introduces the PHP function array_fill_keys(), which creates a new array by using the values of a given keys array as the array's keys and assigning a single specified value to each of those keys.

It explains that the value argument is used as the value for all entries, while the keys argument supplies the keys; any illegal key values are automatically converted to strings.

Parameters

keys : an array whose values will become the keys of the new array.

value : the value to assign to each key.

Return value

The function returns the newly created array populated with the specified keys and value.

Example

<?php
$keys = array('foo', 5, 10, 'bar');
$a = array_fill_keys($keys, 'banana');
print_r($a);
?>

Output

Array
(
    [foo] => banana
    [5] => banana
    [10] => banana
    [bar] => banana
)