[b]De functie:[/b]
[code]
<?php

define("MAX_SIZE", 1);
define("MIN_SIZE", 2);
define("EXACT_SIZE", 3);

function UploadImage($file, $to_url, $allowed_types = NULL, $allowed_ext = NULL, $sizes = NULL)
{
	
	if(is_uploaded_file($file["tmp_name"]))
	{																
											
		list($x, $y, $image_type) = getimagesize($file["tmp_name"]);
		list($gx, $gy, $ctype) = $sizes;
		
		$split_name = explode(".", $file["name"]);		
		$file_name = $file["name"];			
		
		if((($sizes == NULL) || (($ctype == MAX_SIZE) && (($x <= $gx) && ($y <= $gy))) || (($ctype == MIN_SIZE) && (($x >= $gx) && ($y >= $gy))) || (($ctype == EXACT_SIZE) && (($x == $gx) && ($y == $gy)))) && (($allowed_types == NULL) || (array_search($image_type, $allowed_types, true) !== false)) && (($allowed_ext == NULL) || (array_search(strtolower($split_name[count($split_name) - 1]), $allowed_ext) !== false)))
		{	
	
			$pattern = "1234567890abcdefghijklmnopqrstuvwxyz";
	
			while(file_exists($to_url . $file_name))
			{
				
				$split_name[0] = $split_name[0] . $pattern{ rand(0, 35) };	
				
				$file_name = implode(".", $split_name);
				
			}
			
			move_uploaded_file($file["tmp_name"], ($to_url . $file_name));
			
			return $file_name;
	
		}
		
	}

	return false;	
	
}

?>
[/code]
[b]Stukje code om de functie aan te roepen:[/b]
[code]
<?php

if($_SERVER["REQUEST_METHOD"] == "POST") 
{
	
	$sizes = array(60, 40, MIN_SIZE); // array(x, y, MIN_SIZE|MAX_SIZE|EXACT_SIZE)
	$allowed_types = array(IMAGETYPE_GIF, IMAGETYPE_JPEG, IMAGETYPE_PNG); // array(types van: http://nl3.php.net/manual/nl/function.exif-imagetype.php)
	$allowed_ext = array("jpg", "png", "gif"); // array(ext1, ext2, ext3)
	$path = "images/"; // Str: waar die geupload moet worden.
	$global = $_FILES["objUpload"]; // De global.
	
	if($filename = UploadImage($global, $path, $allowed_types, $allowed_ext, $sizes))
	{
		
		echo "Het plaatje is succesvol geupload:<br />\n<img src=\"" . $path . $filename . "\" alt=\"" . $path . $filename . "\" />";
		
	}
	else
	{
		
		echo "Het plaatje kon niet geupload worden.";
		
	}	
	
}

?>
[/code]
[b]De HTML Code:[/b]
[code]
<form method="POST" enctype="multipart/form-data" action="upload.php">
	<input type="file" name="objUpload" />
	<input type="submit" name="objSubmit" value="Upload Plaatje" />
</form>
[/code]