Category Archives: PHP-Image upload

PHP-Image/file upload

This tutorial shows you how to upload an image on your server using PHP and html forms. You will also learn how to verify if the uploaded file is an image (checking the extension), if it doesn’t overtakes a size limit and how to change the uploaded file name.

Important: You must set the enctype form atribute to “multipart/form-data”, otherwise the form will not show you any errors, but it will just not upload your images!

Step 1: Create a folder named images located in the path you are planning to place the php script you are about to create. Make sure to specify the correct path and permission to write.Otherwise the image wont be uploaded.

Step 2: The code goes here . Include this code into the php file.

Please read carefuly the comments. All steps are explained there.

//define a maxim size for the uploaded images in Kb
define (“MAX_SIZE”,”100″);

//This function reads the extension of the file. It is used to determine if the file  is an image by checking the extension.
function getExtensionOfImage($string) {
$i = strrpos($string,”.”);/*it gives the position of the . in integer value  example ram.jpg = 4*/
if (!$i) {

return “”;

$l = strlen($string) – $i; // total string length(7) – 4=3
$extension = substr($str,$i+1,$l);// 3+1=string,4,4 = jpg
return $extension;

//checks if the form has been submitted
//reads the name of the file the user submitted for uploading
//if it is not empty
if ($image)
//get the original name of the file from the clients machine
$imagename = stripslashes($_FILES[‘image’][‘name’]);
//get the extension of the file in a lower case format
$extension = getExtensionOfImage($imagename);
$extension = strtolower($extension);
//if it is not a known extension, we will suppose it is an error and will not  upload the file,
//otherwise we will do more tests
if (($extension != “jpg”) && ($extension != “jpeg”) && ($extension != “png”) && ($extension != “gif”))
//print error message
echo ‘<h1>Unknown extension!</h1>’;
//get the size of the image in bytes
//$_FILES[‘image’][‘tmp_name’] is the temporary filename of the file
//in which the uploaded file was stored on the server

//compare the size with the maxim size we defined and print error if bigger
if ($size > MAX_SIZE*1024)
echo ‘<h1>You have exceeded the size limit!</h1>’;

//we will give an unique name,
//the new name will be containing the full path where will be stored (images folder)
//we verify if the image has been uploaded, and print error instead
$copied = copy($_FILES[‘image’][‘tmp_name’], =”images/”.$image_name);
if (!$copied)
echo ‘<h1>Copy unsuccessfull!</h1>’;

//If no errors registred, print the success message
if(isset($_POST[‘Submit’]) && !$errors)
echo “<h1>File Uploaded Successfully! Try again!</h1>”;


<!–next comes the form, you must set the enctype to “multipart/frm-data” and use an input type “file” –>
<form  method=”post” enctype=”multipart/form-data”>
<tr><td><input type=”file”></td></tr>
<tr><td><input name=”Submit” value=”Upload image”></td></tr>