searching values on array

search if values of an array are present on other array
<?php
$arr1=array("From","source","NT");

$os = array("Mac", "NT", "Irix", "Linux");


foreach($arr1 as $value){
if (in_array($value,$os)) {
    echo "Found $value <br>";
}

else {
echo " Value  $value not found<br>";
}

}

?>


<?php
function version

function removeheader($header,$arr) {


foreach($header as $value){
if (in_array($value,$arr)) {
    echo "Found $value <br>";
}

else {
echo " Value  $value not found<br>";
}

}


}


removeheader($arr1,$os);

?>