[PHP] Miniaturiser des photos

function miniature($image_a_reduire,$chemin) {
$percent = 0.5;
$q=array(80,20);
list($width, $height) = getimagesize($image_a_reduire);
$newwidth = $width * $percent;
$newheight = $height * $percent;
$im = imagecreatetruecolor($newwidth,$newheight);
$image=imagecreatefromjpeg($image_a_reduire);
//$im=array();

imagecopyresized($im,$image,0,0,0,0,$newwidth,$newheight,$width,$height);
imagejpeg($im,$chemin);

<?php

		$host="localhost";
		$user="root";
		$password="";
		$base="immobilier";
		//connection à la base de données
		$link=mysql_connect($host,$user,$password);
		$db_selected=mysql_select_db($base);
  
		if (!$link)
			{
				die('La connection a échoué: '.mysql_error());
			}
			$rowid=10;
			$req="select donnees_binaires from images_binaires where rowid=$rowid order by rowid";
			$resultatphoto=@mysql_query($req);
			$image_originale = @mysql_result($resultatphoto,images_binaires.donnees_binaires);
			$image_a_reduire=imagecreatefromstring($image_originale);
			$image_reduite=miniature($image_a_reduire);
			
			echo $image_originale; 
			echo $image_reduite;
			
			
			mysql_close();
		
		function miniature($image_a_reduire) {
			$width  = imagesx($image_a_reduire);
			$height = imagesy($image_a_reduire);
			$imgw = 200; 
			$imgh = $height / $width * $imgw; 
			$thumb=imagecreatetruecolor($imgw,$imgh); 
			ImageCopyResized($thumb,$image_a_reduire,0,0,0,0,$imgw,$imgh,$width,$height); 
			imagejpeg($thumb);
			
			}
		
		?>