A small example of php caching images generated by gd to memcache_PHP tutorial

//Start caching images 

 ob_start();//Enable output caching, Temporarily cache the content to be output

imagejpeg($newimage,false,$quality);//Output

$data = ob_get_contents();//Get the cache just obtained

ob_end_clean();//Clear the cache

$mem =get_memcache();//Modify it yourself

$mem->set($mem_key,$data,720000); //Save the output just obtained into memcache

echo $data;//Output the picture

Then display it like this

$mem = get_memcache();/ /Modify yourself
$data = $mem->get($mem_key);

if($data) {

echo $data;

exit( );

}