function isPrime($test) {
$prime = 1;
if ($test % 2 == 0 && $test != 2){
return 0;
}
if ($test == 2 || $test == 3) {
return 1;
}
for ($try = 3; $try < $test; $try++){
if (($test % $try) == 0) {
$prime = 0;
}
}
return $prime;
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