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array_keys

Tags: PHP 5.x PHP 7.x PHP 8.x

array_keys — Return all the keys or a subset of the keys of an array.

Description

array_keys(
    array $array,
): array

Description

array_keys(
    array $array,
mixed $search_value,
bool $strict = false
): array
array_keys() returns the keys, numeric and string, from the array.
If a search_value is specified, then only the keys for that value are returned. Otherwise, all the keys from the array are returned.

Parameters

array
An array containing keys to return.
search_value
If specified, then only keys containing these values are returned.
strict
Determines if strict comparison (===) should be used during the search.

Return Values

Returns an array of all the keys in array.

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