subjects.php

<?php

require_once "config.php";

if(isset($_POST['submit'])){
    
    $name = $_POST['name'];
    $marks = $_POST['marks'];
     
    $image = '';
    
    $target_dir = "uploads/";
    $target_file = $target_dir . $_FILES["image"]["name"];
    $tempname = $_FILES["image"]["tmp_name"];  

 
    if (move_uploaded_file($tempname, $target_file)) {
        $image = $target_file;
    }
    
    $sql = "insert into subjects( `name` ,`marks`,`image` ) values ('$name','$marks','$image')";
    mysqli_query($con,$sql);
}


?>
<center>
<a href="index.php"> Search</a> | <a href="students.php"> Add Student</a> | <a href="subjects.php"> Add Subject</a> 
</center>
<h1>Add Subjects</h1>
<form action="" method="post" enctype="multipart/form-data">
<label>Name: </label><input type="text" name="name"/><br/>
<label>Marks: </label><input type="number" name="marks" /><br/>
<label>Image: </label><input type="file" name="image"/><br/>
<input type="submit" name="submit" />
</form>