Can you sum or add in a variable while inserting data? - php

Question

I would like to ask if it is possible to add together with a variable, I've manage it to echo it and it worked.
But is it possible in a insert statement?
Here is my code!
<?php
include('admin/db/database_configuration.php');
$sql = "SELECT * FROM tblalbums";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// output data of each row
$row = $result->fetch_assoc();
$wow = $row['album_id'];
echo ($row['album_id']+1);
} else {
echo "0 results";
}
$conn->close();
?>
<?php
include('admin/db/database_configuration.php');
if (isset($_FILES["userfile"]) && !empty($_FILES["userfile"])) {
$image = $_FILES['userfile']['tmp_name'];
$imageSize = $_FILES['userfile']['size'];
$imageType = $_FILES['userfile']['type'];
// $job_desc = $_POST['desc'];
$imageName = $_FILES['userfile']['name'];
$len = count($image);
$path = "jobs/";
for ($i = 0; $i < $len; $i++) {
if (isset($imageName[$i]) && $imageName[$i] !== NULL) {
if(move_uploaded_file($image[$i], $path.$imageName[$i])) {
// $result = $conn->query("INSERT INTO tbljoba ( job_img_size, job_img_type, job_desc, job_img) VALUES ('$imageSize[$i]', '$imageType[$i]', '$job_desc', '$imageName[$i]')");
$sql = "INSERT INTO `tblphotos` ( imageName, imageSize, imageType, album_id) VALUES ('$imageName[$i]','$imageSize[$i]', '$imageType[$i]', '$wow');";
// echo"<script>alert('Image upload successfully!');location.href='employer_contact_us.php';</script>";
if ($conn->query($sql) === TRUE) {
echo "New records created successfully";
} else {
echo "Error: " . $sql . "<br>" . $conn->error;
}
}
}
}
}
$conn->close();
?>
As you can see above the variable $wow is album_id in the database, and i've echo it so the last number in the database + 1.
So i've got the INSERT statement and you can see there I've put the variable $wow. So how can add or sum up + 1 in adding values?
Thank you!

Answer 1

remove single quoted lines ' ' from $wow in VALUES then +1
$wow=1 without single quoted lines so that it will not read as a string to the database

Answer 2

You can find and read information about AUTO_INCREMENT for fields in MySQL
May be this can help you.