<?php
$array = [
'a' => 'dog',
'b' => 'cat',
'c' => 'cow',
'd' => 'duck',
'e' => 'goose',
'f' => 'elephant'
];// Check, if all animal names are shorter than 12 letters.
var_dump(array_all($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);
}));
?>

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