使用PHP进行图像缓存

Question

i am trying to learn how to cache an image that is created in PHP, this current piece of PHP wil cache text to a file, but i want to get it to cache an image called 'my_barcode.png' to the cache folder, any help would be greatly appreciated.

<?php

$h = opendir('data/');
$chace = 'cache/test.cache.php';

if(file_exists($chace))
{
include($chace);
}
else
{
$result = NULL;
while (($file = readdir($h)) !=false)
{
$result .= $file. '<br />';
}

closedir($h);

echo $result;

$fs = fopen($chace, 'w+');
fwrite($fs, $result);
fclose($fs);
}
?>

Answer 1

If the purpose is to serve cached files, PHP should create them when not existing but the http server (such as Apache) should be serving the static files if they exist. Implementing cache the way you did takes too many resources as PHP is still called.