Php save more Array into MySQL - php

Question

I'm trying to save arrays on a MySQL database with PHP.
The code inserts only the first line, if I have an array of 5 elements it just inserts the first element and the others and 4 don't save them for me.
Can anyone tell me where I'm wrong?
Thanks a lot.
<?php
//getting user values
$day = $_POST['Day'];
$nDay = $_POST['n_Day'];
$fieldOne = $_POST['Field_one'];
$fieldTwo = $_POST['Field_two'];
$timeOne = $_POST['Time_one'];
$timeTwo = $_POST['Time_two'];
$idR = $_POST['id_ristorante'];
$day_array = explode(",",$day);
$nDay_array = explode(",",$nDay);
$timeOne_array = explode(",",$timeOne);
$timeTwo_array = explode(",",$timeTwo);
$len = count($day_array and $nDay_array and $timeOne_array and $timeTwo_array);
$output=array();
//require database
require_once('db.php');
//checking if email exists
$conn=$dbh->prepare('SELECT id_ristorante FROM Orari WHERE id_ristorante=:idR');
$conn->bindParam(':idR', $idR, PDO::PARAM_STR);
$conn->execute();
//results
if($conn->rowCount() !==0){
$output['isSuccess'] = 0;
$output['message'] = "Orario già inserito";
} else {
for($i=0;$i<$len;$i++){
$day = $day_array[$i];
$nDay = $nDay_array[$i];
$timeOne = $timeOne_array[$i];
$timeTwo = $timeTwo_array[$i];
$conn=$dbh->prepare('INSERT INTO Orari (Day, n_Day, Field_one, Field_two, Time_one, Time_two, id_ristorante) VALUES (?,?,?,?,?,?,?)');
//encrypting the password
$conn->bindParam(1,$day);
$conn->bindParam(2,$nDay);
$conn->bindParam(3,$fieldOne);
$conn->bindParam(4,$fieldTwo);
$conn->bindParam(5,$timeOne);
$conn->bindParam(6,$timeTwo);
$conn->bindParam(7,$idR);
$conn->execute();
if($conn->rowCount() == 0) {
$output['isSuccess'] = 0;
$output['message'] = "Errore, riprova.";
} elseif($conn->rowCount() !==0){
$output['isSuccess'] = 1;
$output['message'] = "Orari salvati!";
}
}
}
echo json_encode($output);
?>

Answer 1

When you trying to do count on multiple array as:
$len = count($day_array and $nDay_array and $timeOne_array and $timeTwo_array);
The and cause the array to be boolean evaluated so the final assign to $len is 1 and that why the loop is done only once and only the first element is inserted to DB.
If all the array in the same length you should just do count on 1 of them as:
$len = count($day_array)
Better practice will be to do count on each on them and then assign $len with the minimum value

Answer 2

Change this line
$len = count($day_array and $nDay_array and $timeOne_array and $timeTwo_array);
To
$len = count($day_array) + count($nDay_array) + count($timeOne_array) + count($timeTwo_array);