- in_array: documentation ( source)
<?php
$array1 = array("1","2","3","4","0");
$array2 = array("1","1","3","4","5");
foreach($array2 as $k=>$v){
if(in_array($v,$array1 )){
echo "Value $v exists \n";
}else{
echo "Value $v does not exists \n";
}
}