In this example i am going to explain How to reset AUTO INCREMENT to one in MySQL PHP.
There is many way to reset AUTO_INCREMENT to 1in MySQL
Run the query in your database.
ALTER TABLE tablename AUTO_INCREMENT = 1;
ALTER TABLE student_data AUTO_INCREMENT = 1;
<?php
$host='localhost';
$username='root';
$password='';
$conn=mysqli_connect($host,$username,$password,"student");
mysqli_query($conn,"ALTER TABLE category AUTO_INCREMENT = 1");
echo "Auto_increment reset to 1 Successfully ! ";
?>