- var_dump: documentation ( source)
- array_shift: documentation ( source)
- sort: documentation ( source)
<?php
function count_and_find($arr) {
sort($arr);
$missing = array();
$index = 0;
$count = count($arr);
while ($num = array_shift($arr)) {
do {
if ($index < $num) {
$missing[] = $index;
$index++;
}
} while ($index < $num);
}
return array('missing' => $missing, 'total' => $count);
}
var_dump(count_and_find(array(1,6,2,9,3,0,5,7,4)));