<?php
$c = array();
// You store some data using some string keys
foreach (array('ab', 'cd', '10', 'gh', '24') as $key) {
$c[$key] = 1;
}
// You pass the array $c to some place else and there you do something like
foreach ($c as $k => $v) {
if ($k === '10') {
echo "found";
}
}
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