array_keys
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,array_keys() returns the keys, numeric and string, from the array.
mixed $search_value,
bool $strict = false ): 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.More information about array_keys on official PHP documentation site
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