How to check if an array is empty

Short answer

Compare the array with an empty array:

<?php
 
$items = [];
 
var_dump($items === []);

Output:

bool(true)

The number of elements is zero:

<?php
 
$items = [];
 
var_dump(count($items) === 0);

Output:

bool(true)

An empty array counts as false in a condition, so the check can be written briefly:

<?php
 
$items = [];
 
echo $items ? 'has items' : 'empty';

Output:

empty