Condition for comparing two arrays - php

Question

I have two variables that return various Id numbers. I intend that when the value exists in the two variables that I update the database, if the value only exists in one, I do insert.
For example the variables will return the following values:
$N_utente1(1,2,3,4,5,6)
$N_utente(1,2,4,5,7)
So I want to create a condition that does the following:
If the values ​​in the variable $N_utente are equal to the values ​​of the variable $N_utente1, then it updates and in case the value of the variable $N_utente does not exist in the variable $N_utente1 then it inserts these values.
my code:
$query1 = $conn->prepare("SELECT N_utente FROM raddb.Areceber");
$query1->execute();
while($row=$query1->fetch(PDO::FETCH_ASSOC)){
$N_utente1 = $row["N_utente"];
$file = $_FILES["file"]["tmp_name"];
$file_open = fopen($file,"r");
while(($csv = fgetcsv($file_open, 1000, ",")) !== false){
$N_utente = $csv[1];
if($N_utente == $N_utente1){
$query = 'UPDATE Areceber SET N_utente= ? WHERE N_utente = ? ';
$conn->prepare($query)->execute([$N_utente, $$N_utente]);
}else{
$query = 'INSERT INTO Areceber (Id_linha, N_utente)
VALUES ( ?, ?)';
$stmt= $conn->prepare($query);
$stmt->execute([$Id, $N_utente]);
}
}
}
What I want is for the condition to compare the two values ​​line by line and if true, update, if false, insert

Answer 1

<pre>
use this code I think it will work
for ( $j = 0; $j <= count($a)||$j <= count($b); $j+1 ) {
if (a[$j] == b[$j] ) {
//
} else {
//
}
}
</pre>