array_all()

array_all() — Checks if all array elements satisfy a callback function.

Built-in function of PHP 8.5. The manual lists it as available in PHP 8 >= 8.4.0. This page is the reference card: signature, parameters and return value, plus the changelog and the example the manual provides.

What it does

array_all() returns true, if the given callback returns true for all elements. Otherwise the function returns false.

Signature

array_all(array $array, callable $callback): bool callback(mixed $value, mixed $key): bool

Parameters

Parameter	Type	What it takes
$array	array	The array that should be searched.
$callback	callable	The callback function to call to check each element, which must be of the following signature: function callback(mixed $value, mixed $key): bool If this function returns false, false is returned from array_all() and the callback will not be called for further elements.

Return value

The function returns true, if callback returns true for all elements. Otherwise the function returns false.

Example

A runnable snippet:

$array = [ 'a' => 'dog', 'b' => 'cat', 'c' => 'cow', 'd' => 'duck', 'e' => 'goose', 'f' => 'elephant' ]; // Check, if all animal names are shorter than 12 letters. var_dump(array_all($array, function (string $value) { return strlen($value) < 12; })); // Check, if all animal names are longer than 5 letters. var_dump(array_all($array, function (string $value) { return strlen($value) > 5; })); // Check, if all array keys are strings. var_dump(array_all($array, function (string $value, $key) { return is_string($key); }));

Output:

bool(true) bool(false) bool(true)