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array_key_first

Description

The array_key_first of Array for PHP gets the first key of an array.

Syntax

array_key_first(
    array $array
): int|string|null

Parameters

array

An array.

Return

Returns the first key of array if the array is not empty; null otherwise.

Examples

1 · array · indexed

<?

$array =
[
    "a",
    "b",
    "c"
];

$return = array_key_first($array);

var_export($return);

0

2 · array · associative

<?

$array =
[
    "mykey1" => "a",
    "mykey2" => "b",
    "mykey3" => "c"
];

$return = array_key_first($array);

var_export($return);

'mykey1'

3 · array · empty

<?

$array = [];

$return = array_key_first($array);

var_export($return);

NULL