Global functions: handy global function for any PHP project http://umakantpatil.com/posts/global-functions-handy-for-any-php-project

global.php

<?php
/**
 * Global functions.
 */

/**
 * Returns true if $var is not null.
 *
 * Useful in array_filter and other areas without involving anonymous
 * functions (which phpcs throws a fit over all too often).
 *
 * @param mixed $var Variable to check.
 *
 * @return boolean
 */
function notNull(&$var) {
    return $var !== null;
}

/**
 * Return true if the given array is associative, false if not.
 *
 * @param mixed $arr Array to inspect.
 *
 * @return boolean true = Associative array, false = not.
 */
function isAssoc($arr) {
    if (!$arr || !is_array($arr)) {
        return false;
    }
    $keys = array_keys($arr);
    return array_keys($keys) !== $keys;
}

/**
 * Return the variable if set, or $default if not.
 *
 * Because $var is passed by reference, this function will autovivify
 * array indexes and object properties. If testing arrays, you
 * probably want ifseta. If testing objects, you probably want ifseto.
 *
 * @param mixed $var     Variable to inspect and possibly return.
 * @param mixed $default Value to return if $var is not set.
 *
 * @return mixed $var or $default
 */
function ifsetor(&$var, $default = null) {
    return ($var !== null) ? $var : $default;
}

/**
 * Return the value at $offset in $array if set, or $default if not.
 *
 * @param mixed $array   Array to inspect.
 * @param mixed $offset  Offset into $array.
 * @param mixed $default Value to return if $array[$offset] is not set.
 *
 * @return mixed $array[$offset] or $default
 */
function ifseta($array, $offset, $default = null) {
    return is_array($array) && isset($array[$offset]) ? $array[$offset] : $default;
}

/**
 * Return the value of a property in an object if set, or $default if not.
 *
 * @param object $object   Object to inspect.
 * @param mixed  $property Property on $object.
 * @param mixed  $default  Value to return if $object->$property is not set.
 *
 * @return mixed $array[$offset] or $default
 */
function ifseto($object, $property, $default = null) {
    return isset($object->$property) ? $object->$property : $default;
}

/**
 * Return the value of a constant if set, or $default if not.
 *
 * @param string $constant Constant name.
 * @param mixed  $default  Default value (optional).
 *
 * @return mixed Value of constant $constant or $default
 */
function ifdefor($constant, $default = null) {
    return defined($constant) ? constant($constant) : $default;
}