Php wont input data into database - php

Question

So im trying to get my data from my form submission to be put into a mysql database but whenever i submit a form it gives me this error: Error: INSERT INTO form_submissions(ID, first, last, phone, class) VALUES ([value-1],[value-2],[value-3],[value-4],[value-5])
Now here is my PHP code:
<?php
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "form_database";
$value = $_POST['first'];
$value1 = $_POST['last'];
$value2 = $_POST['phone'];
$value3 = $_POST['class'];
$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error){
die("connection failed: " . $conn->connect_error);
}
$sql = "INSERT INTO `form_submissions`(`ID`, `first`, `last`, `phone`,
`class`) VALUES ([value-1],[value-2],[value-3],[value-4],[value-5])";
if ($conn->query($sql) === TRUE) {
echo "Submitted Successfully";
} else {``
echo "Error: " . $sql . "<br>" . $conn->error;
}
$conn->close();
?>

Answer 1

assuming that ID is auto-incrementing, and that the others are text,
$sql = "INSERT INTO `form_submissions`(`first`, `last`, `phone`,
`class`) VALUES ('$value','$value1','$value2','$value3')";

Answer 2

Your query should be like:
INSERT INTO `form_submissions`(`first`, `last`, `phone`, `class`)
VALUES ('John','doe', '98564', 'SOMECLASS');
To check: echo the $sql query and debug it in phpmyadmin.
Note: If you enabled AUTO_INCREMENT, you can ignore the data feed of that column. It will do its job automatic.
Security tip - >
To prevent SQLi Injection check out this post.

Answer 3

There are two things wrong.
The first thing is you give 5 fields (ID, First, last, phone, class)
And you only have 4 variables in your post. I think you don’t need to send the ID on an insert if the column is set to auto increment in the database, So don’t send an value for the ID field.
Your variables are not correctly inserted in the query.
The [value-1] douse not mean the $value1 variable will automatically be injected in there.
This can be done in a lot of way’s
I wil give you a simple solution, (but it wil be a bad one for real websites). The simple solution is:
$sql = "INSERT INTO `form_submissions`(`first`, `last`, `phone`,`class`) VALUES (`$value`,`$value1`,`$value2`, `$value3`)";
The reason this is bad is: You are directly entering post data inside your query and are now vounerable to SQL-Injections. You need to escape your post data befoure inserting it in a query. Or better yet don’t use ‘mysqli’ but an PDO.
An good PDO example can be found here
https://www.w3schools.com/php/php_mysql_insert.asp
I hope this helps.

Answer 4

Your SQL is apparently wrong. It should look's like with something like that:
$sql = "INSERT INTO `form_submissions`(`ID`, `first`, `last`, `phone`,
`class`) VALUES ($value1,$value2,$value3,$value4,$value5)";
The field ID should be auto_increment. If it is, you don't need to pass value to it.