PHP Tutorial: Uploading files using PHP and HTML Form

The following code illustrates how to upload files using HTML Form and PHP.

form.php

<form action="upload.php" method="post" ENCTYPE="multipart/form-data">
File: <input type="file" name="file" size="30"> <input type="submit"
value="Upload!">
</form>


upload.php

<?php
// ==============
// Configuration
// ==============
$uploaddir = "uploads"; // Where you want the files to upload to - Important: Make sure this folders permissions is 0777!
$allowed_ext = "jpg, gif, png, pdf"; // These are the allowed extensions of the files that are uploaded
$max_size = "50000"; // 50000 is the same as 50kb
$max_height = "100"; // This is in pixels - Leave this field empty if you don't want to upload images
$max_width = "100"; // This is in pixels - Leave this field empty if you don't want to upload images

// Check Entension
$extension = pathinfo($_FILES['file']['name']);
$extension = $extension[extension];
$allowed_paths = explode(", ", $allowed_ext);
for($i = 0; $i < count($allowed_paths); $i++) {
if ($allowed_paths[$i] == "$extension") {
$ok = "1";
}
}

// Check File Size
if ($ok == "1") {
if($_FILES['file']['size'] > $max_size)
{
print "File size is too big!";
exit;
}

// Check Height & Width
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;
}
}

// The Upload Part
if(is_uploaded_file($_FILES['file']['tmp_name']))
{
move_uploaded_file($_FILES['file']['tmp_name'],$uploaddir.'/'.$_FILES['file']['name']);
}
print "Your file has been uploaded successfully! Yay!";
} else {
print "Incorrect file extension!";
}
?>