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Ok so i have an upload script and i want it to resize the image so that the height is 100px and it holds its aspect, but i have never used gd and cant figure out how to do this/where to add it.

 

here is my code if someone could help that would be ace

<?php 
include("../login/include/session.blc");
$directory_self = str_replace(basename($_SERVER['PHP_SELF']), '', $_SERVER['PHP_SELF']);
$uploadsDirectory = $_SERVER['DOCUMENT_ROOT'] . $directory_self . 'userpics/';
$uploadForm = 'http://' . $_SERVER['HTTP_HOST'] . $directory_self . 'upload.form.blc';
$uploadSuccess = 'http://' . $_SERVER['HTTP_HOST'] . $directory_self . 'upload.success.blc';
$fieldname = 'file';
$errors = array(1 => 'php.ini max file size exceeded', 
                2 => 'html form max file size exceeded', 
                3 => 'file upload was only partial', 
                4 => 'no file was attached');

isset($_POST['submit'])
or error('the upload form is needed', $uploadForm);

($_FILES[$fieldname]['error'] == 0)
or error($errors[$_FILES[$fieldname]['error']], $uploadForm);

@is_uploaded_file($_FILES[$fieldname]['tmp_name'])
or error('not an HTTP upload', $uploadForm);

@getimagesize($_FILES[$fieldname]['tmp_name'])
or error('only image uploads are allowed', $uploadForm);

$now = time();
while(file_exists($uploadFilename = $uploadsDirectory.$now.'-'.$_FILES[$fieldname]['name']))
{

$now++;

}
$username = $session->username;
$pic = $now.'-'.$_FILES[$fieldname]['name'];
    mysql_query ("UPDATE users SET pic = '$pic' WHERE username = '$username'");
@move_uploaded_file($_FILES[$fieldname]['tmp_name'], $uploadFilename)
or error('receiving directory insuffiecient permission', $uploadForm);
header('Location: ' . $uploadSuccess);

function error($error, $location, $seconds = 5)
{
header("Refresh: $seconds; URL=\"$location\"");
echo '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"'."\n".
'"http://www.w3.org/TR/html4/strict.dtd">'."\n\n".
'<html lang="en">'."\n".
'	<head>'."\n".
'		<meta http-equiv="content-type" content="text/html; charset=iso-8859-1">'."\n\n".
'		<link rel="stylesheet" type="text/css" href="stylesheet.css">'."\n\n".
'	<title>Upload error</title>'."\n\n".
'	</head>'."\n\n".
'	<body>'."\n\n".
'	<div id="Upload">'."\n\n".
'		<h1>Upload failure</h1>'."\n\n".
'		<p>An error has occured: '."\n\n".
'		<span class="red">' . $error . '...</span>'."\n\n".
'	 	The upload form is reloading</p>'."\n\n".
'	 </div>'."\n\n".
'</html>';
exit;
} 

?>

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