Problema con if tra due stringhe

[Manuelandro]

$conto=0;
foreach ($keys1 As $arrayindex => $ingredientidb)
{
foreach ($keys As $ingrdientiform)
{
if(strpos($ingredientidb) && strpos($ingredientiform)){
$conto ++;
}
}
}
$countingredienti = $arrayindex + 1;
$media = ($conto * 10) / $countingredienti; 

prova mpò...