<?php
function punyaHuruf($kataPertama, $kataKedua) {
    $kataPertama = strtolower($kataPertama);
    $kataKedua = strtolower($kataKedua);
 
    for ($i = 0; $i < strlen($kataPertama); $i++) {
        $huruf = $kataPertama[$i];
 
        if (strpos($kata2, $huruf) === false) {
            return false;
        }
    }
 
    return true;
}
 
echo punyaHuruf("cat", "antarctica");
echo punyaHuruf("cat", "australia");
echo punyaHuruf("cat", "ANTARCTICA");
?>
 

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