function isSubset($arr1, $arr2) {
$size1 = count($arr1);
$size2 = count($arr2);
for ($i = 0; $i < $size2; $i++) {
for ($j = 0; $j < $size1; $j++) {
if ($arr2[$i] == $arr1[$j])
break;
}
if ($j == $size1)
return false;
}
return true;
}
$arr1 = array( 5, 1, 8, 12, 40, 7, 9, 100 );
$arr2 = array( 8, 40, 9, 1 );
if (isSubset($arr1, $arr2))
echo "yes";
else
echo "no";
/*
run:
yes
*/