PHP 8 reference · Array Functions

PHP array_fill_keys() Function

Create an array from a list of keys, giving every key the same value. Useful for defaults and counters.

PHP 8 Since 5.2

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Syntax

array_fill_keys(array $keys, mixed $value): array

Parameter	Description
`keys`	The keys to use.
`value`	The value for every key.

The new array.

Start counters at 0Try it yourself

<?php
print_r(array_fill_keys(["tea", "cake", "milk"], 0));

Output

Array
(
    [tea] => 0
    [cake] => 0
    [milk] => 0
)

Default form valuesTry it yourself

<?php
$fields = ["name", "email", "phone"];
$form = array_merge(array_fill_keys($fields, ""), ["name" => "Ada"]);
print_r($form);

Output

Array
(
    [name] => Ada
    [email] => 
    [phone] => 
)

Version	Change
PHP 5.2	Added

array_fill() · Create an array filled with the same value, given a start index and a count.
array_combine() · Create an array by using one array for keys and another for values. Both arrays must have the same number of elements.
PHP Arrays · tutorial
PHP Array Functions · tutorial