- var_dump: documentation ( source)
<?php
$a = array(
'a' => null,
'b' => false,
'c' => true,
'd' => "",
'e' => 0,
'f' => 1,
'g' => "a",
);
foreach($a as $key => $row) {
echo $key . "\n";
var_dump(isset($row));
var_dump(!empty($row));
echo "\n";
}