Questions tagged [array-key]

array-key() refers to key portion of array holding key and value pair. In PHP array_keys() returns the keys, numeric and string, from the input array.

array array_keys ( array $array [, mixed $search_value [, bool $strict = FALSE ]] )

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

Example:

$array = array(0 => 100, "color" => "red");
print_r(array_keys($array));

$array = array("blue", "red", "green", "blue", "blue");
print_r(array_keys($array, "blue"));

Result:

Array
(
    [0] => 0
    [1] => color
)

Array
(
    [0] => 0
    [1] => 3
    [2] => 4
)

Reference

• Official documentation