<?php
/*
 * Two annoying omissions from PHP are the lack of array_all() and array_any(), which check if
 * a condition represented by a callback holds for all or any of the elements in an array. 
 */
 
function array_all(array $arr, $cb) {
    foreach ($arr as $e) {
        if (!call_user_func($cb, $e)) {
            return false;
        }
        return true;
    }
}
 
function array_any(array $arr, $cb) {
    foreach ($arr as $e) {
        if (call_user_func($cb, $e)) {
            return true;
        }
        return false;
    }
}