Uploading image dont have an extension - php

Question

I created a form and am trying to upload image to directory and add the path in database. Hence, i submit the form only the image filename gets submitted without file extension name and also it wont be uploaded in the directory.
Below is my php code
if(isset($_POST['addcourse'])) {
$uploadDirectory = "images/";
if (!isset($_FILES['passport']) || !is_uploaded_file($_FILES['passport']['tmp_name'])) {
$passport_data = $_FILES['passport']['tmp_name']; //file input
// $passport_name = $_FILES['passport']['name']; //unique id for random filename
$passport_size = $_FILES['passport']['size'];
$unique_name = uniqid();
$extension = pathinfo($_FILES['passport']['name'], PATHINFO_EXTENSION);
// $target_file = $uploadDirectory.basename($_FILES['passport']['name']);
$target_file = $uploadDirectory . basename($unique_name . "." . $extension);
$passport_name = $unique_name . "." . $extension;
move_uploaded_file($passport_data, $target_file);
$name = mysqli_escape_string($myConn, $_POST["name"]);
$code = mysqli_escape_string($myConn, $_POST["code"]);
$course_req = mysqli_escape_string($myConn, $_POST["course_req"]);
$course_des = mysqli_escape_string($myConn, $_POST["course_des"]);
$sql = "INSERT INTO courses (name,code,course_req,course_des,passport)
VALUES ('$name','$code','$course_req','$course_des','$passport_name')";
if (mysqli_query($myConn, $sql)) { ?>
<script type="text/javascript">
alert("New Course Created Successfully");
window.location = "addcourse";
</script>
<?php } else {
echo "Error: " . $sql . ":-" . mysqli_error($myConn);
}
mysqli_close($myConn);
}
}
?>
Below is the form i created
<form class="form-horizontal" action="insert" method="post" role="form" enctype="multipart/form-data">
<div class="form-group row">
<label class="control-label col-sm-3 align-self-center">Course Name:</label>
<div class="col-sm-9">
<input type="text" name="name" class="form-control" id="course" placeholder="Enter Course Name">
</div>
</div>
<div class="form-group row">
<label class="control-label col-sm-3 align-self-center">Course Code:</label>
<div class="col-sm-9">
<input type="text" name="code" class="form-control" id="code" placeholder="Enter Course Code">
</div>
</div>
<div class="form-group row">
<label class="control-label col-sm-3 align-self-center">Course Requirements:</label>
<div class="col-sm-9">
<textarea type="text" name="course_req" class="form-control" id="course_req" rows="3"></textarea>
</div>
</div>
<div class="form-group row">
<label class="control-label col-sm-3 align-self-center">Course Description:</label>
<div class="col-sm-9">
<textarea type="text" name="course_des" class="form-control" id="course_des" rows="3"></textarea>
</div>
</div>
<div class="form-group row">
<label class="control-label col-sm-3 align-self-center">Featured Image:</label>
<div class="col-sm-9">
<input type="file" id="myfile" name="myfile"> </div>
</div>
<div class="form-group">
<!-- <input type="submit" name="addcourse" class="btn btn-primary" Value="addcourse">
--> <button type="submit" name="addcourse" class="btn btn-primary">Submit</button>
<button type="submit" class="btn bg-danger">Cancel</button>
</div>
</form>
Attached image is how the database looks like after submission
I have checked the file naming and i expect the generated temp file name to be stored in passport field of table, then moved it the target folder.

Answer 1

My basic example (upload and read a file) is like that :
<?php
if (isset($_FILES['the_key']['error']) && $_FILES['the_key']['error'] == UPLOAD_ERR_OK)
{
if (is_uploaded_file($_FILES['the_key']['tmp_name']))
{
$extension = strrpos($_FILES['the_key']['name'], '.'); // locate the last dot
if ($extension !== false)
{
$extension = substr($_FILES['the_key']['name'], 1 + $extension);
// if needed add here a custom extension validation instead of ctype_alnum
$extension = ctype_alnum($extension) ? '.' . strtolower($extension) : '.unknown';
}
else
$extension = '.no-extension';
$filename = sha1(mt_rand()) . $extension ; // get a name
move_uploaded_file($_FILES['the_key']['tmp_name'], $filename); // take the file
readfile($filename); // read
unlink($filename); // delete
exit;
}
}
?>
<form method=post enctype="multipart/form-data">
<input type=file name=the_key>
<input type=submit>