Find missing item in array 1-100

file.php

<?php

/* Generate random array */
$m = rand(1,100);
echo '<p>Answer: '.$m.'</p>';
$list = array();
for ($i=1;$i<=100;$i++) $list[] = $i;
unset($list[array_search($m,$list)]);

function findMissing ($list, $idx = 1) {
	if ($idx >= 98) return 'too much to handle';
	if (array_search($idx, $list, true) === false) {
		return $idx;
	}
	$idx++;
	return findMissing($list, $idx);
}

echo '<p>Missing ' . findMissing($list) . ' in the array.</p>';