Upload file with PHP

Ever wondered how to upload a file using a form on your page and some lines of PHP? Here's a little script for you to use in your applications if the answer to my question is YES. It could get simpler then this but I like it this way because it performs some file checks (extensions, size in kilobites and size in pixels - width and height - if you will be uploading images. There's a little part at the beginning where you're supposed to edit the configuration code to suit your needs and you're done.

You need to create a folder for uploads (or use an old one) and set it permission to 0777 (using your ftp client right click on the desired folder and select "file permissions". Check every checkbox (or simply write 777) and click ok.

//This is the part where we edit our configuration

// Where you want the files to upload to
//Important: Make sure this folders permissions is 0777!
$upload_dir = "uploads"; 

// If you want to restrict to certain extensions do it here
$extensions_allowed = "jpg, gif, png, pdf"; 

// This is a maximum limit of 100kb
$max_size = "100000"; 

// 100 pixels maximum in height, this can be left empty if you don't deal with images
$max_height = "100"; 

// The same as the above. This refers to the width of the image. 
//Leave it empty if you don't deal with images
$max_width = "100"; 

// We will check the extension here to see if it's allowed or not
$extension = pathinfo($_FILES['file']['name']);
$extension = $extension[extension];
$allowed_paths = explode(", ", $extensions_allowed);
for($i = 0; $i < count($allowed_paths); $i++) {
 if ($allowed_paths[$i] == "$extension") {
 $ok = "1";
 }
}

// We will check the file size here to see if it's within our limits
if ($ok == "1") {
if($_FILES['file']['size'] > $max_size)
{
print "File size is too big!";
exit;
}

// We will check the height and width of the image to see if it's within our limits
if ($max_width && $max_height) {
list($width, $height, $type, $w) = getimagesize($_FILES['file']['tmp_name']);
if($width > $max_width || $height > $max_height)
{
print "File height and/or width are too big!";
exit;
}
}

// If everything passes we upload the file
if(is_uploaded_file($_FILES['file']['tmp_name']))
{
move_uploaded_file($_FILES['file']['tmp_name'],$upload_dir.'/'.$_FILES['file']['name']);
}
print "Your file has been uploaded successfully! Yay!";
} else {
print "Incorrect file extension!";
}

For coding help and further support please use the forum.

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