How to check if array is empty - true or false

Question

I have a question, how do I put a condition for a function that returns true or false, if I am sure that the array is empty, but isset() passed it.

$arr = array();

if (isset($arr)) {
    return true;
} else {
    return false;
}

In this form returns bool(true) and var_dump shows array (0) {}.

Answer 1

If it's an array, you can just use if or just the logical expression. An empty array evaluates to FALSE, any other array to TRUE (Demo):

$arr = array();

echo "The array is ", $arr ? 'full' : 'empty', ".\n";

The PHP manually nicely lists what is false and not.