Online PHP editor | refs for vDY3K

@ 2015-04-15T18:55:15Z

<?php

$arr = array(
    'foo' => false,
    'bar' => '',
    'baz' => null,
    'olo' => 0,
);

var_dump(
    isset($arr['foo']),
    isset($arr['bar']),
    isset($arr['baz']),
    isset($arr['olo'])
);