Uploading File using php (Single File)

upload_file.php

<!-- HTML PART -->
<form enctype="multipart/form-data" action="<?php echo htmlentities($_SERVER['PHP_SELF']); ?>" method="post" name="changer">
<input name="MAX_FILE_SIZE" value="1002400" type="hidden"> <!-- File size -->
<input name="image" accept="image/jpeg" type="file" value="">
<input value="Submit" type="submit">


<?php
if(!isset($_FILES['image']))
    {
    echo '<p>Please select a file</p>';
    }
else
    {
    try{
        upload();
        echo '<p>Thank you for submitting</p>';
        }
    catch(Exception $e)
        {
        echo '<h4>'.$e->getMessage().'</h4>';
		}
    }
	
	function upload() {
		$con = mysqli_connect("localhost","root","root","test");

		if(!$con) {
			echo "Error -> ".mysqli_connect_error();
			die();
		}
		echo "Connected ! <br>";
		print_r($_FILES['image']['size']);
		if($_FILES['image']['size'] > 100) {
				$target_dir = "uploads/";
				$target_file = $target_dir.basename($_FILES['image']['name']);
				print_r("<br>".$target_file);
				$name = $_FILES['image']['name'];
				print_r("<br>".$name);
				$size = getimagesize($_FILES['image']['tmp_name']);
				$size = $size['mime'];
				print_r("<br>".$size);
				$imageType = pathinfo($target_file,PATHINFO_EXTENSION);
				print_r("<br>".$imageType);
				if($imageType == "jpg" || $imageType == "png" || $imageType == "jpeg") {
				
					if (file_exists($target_file)) {
						echo " <script> alert(\"Sorry, file already exists\") </script>";
					}
					else {
					$statement = "insert into img_upload (img_path,name,type) values('$target_file','$name','$size')";
					mysqli_query($con,$statement);
					move_uploaded_file($_FILES['image']['tmp_name'], $target_file);
					echo "<br /> <br />The file ". basename( $_FILES['image']['name']). " has been uploaded.";
					}
				
				}
				else { echo "Not Supported Extention "; }
			}
			mysqli_close($con);
	}
?>