Resize image

function crear_miniatura($name,$filename,$new_w,$new_h,$carpeta){
	$system=explode(".",$_FILES['Filedata']['name']);
	if (preg_match("/jpg|jpeg|JPG|JPEG/",$system[1])){$src_img=imagecreatefromjpeg($name);}
	if (preg_match("/png/",$system[1])){$src_img=imagecreatefrompng($name);}
	if (preg_match("/gif/",$system[1])){$src_img=imagecreatefromgif($name);}
 
	$old_x=imageSX($src_img);
	$old_y=imageSY($src_img);
	$proporcion = $old_x/$old_y;
	$proporcion_correcta = $new_w/$new_h;
	if ($proporcion >= $proporcion_correcta) {
		$recorte_h=$old_y;
		$recorte_w=$old_y*$proporcion_correcta;
	}else{
		// si es vertical
		$recorte_h=$old_y;
		$recorte_w=$old_y*$proporcion_correcta;
		//$recorte_w=$old_x;
		//$recorte_h=$old_x/$proporcion_correcta;
	}
	$x_recorte = $old_x/2 - $recorte_w/2;
	$y_recorte = $old_y/2 - $recorte_h/2;
	$dst_img=ImageCreateTrueColor($new_w,$new_h);
	imagecopyresampled($dst_img,$src_img,0,0,$x_recorte,$y_recorte,$new_w,$new_h,$recorte_w,$recorte_h); 
	imagejpeg($dst_img,$carpeta.$filename,85);
	imagedestroy($dst_img);
	imagedestroy($src_img);
}
 
 
	crear_miniatura($_FILES['Filedata']['tmp_name'],$nuevo_nom,400,300,"../media/");
	crear_miniatura($_FILES['Filedata']['tmp_name'],"pq_".$nuevo_nom,40,40,"../media/");