我是PHP新手。我以免费广告创建一个网站，我需要的是当有人发布新广告时，所有图片都将被自动压缩或调整大小以使用更少的空间而又不影响我的页面加载，我的网站位于PHP上，我该怎么办？做这个？与脚本或PHP代码？我在这里找到下面的代码，会好吗？我该怎么用？
<IfModule mod_expires.c>
Expiresactive On
ExpiresDefault "access plus 7200 seconds"
ExpiresByType image/jpg "access plus 2592000 seconds"
ExpiresByType image/jpeg "access plus 2592000 seconds"
ExpiresByType image/png "access plus 2592000 seconds"
ExpiresByType image/gif "access plus 2592000 seconds"
AddType image/x-icon .ico
ExpiresByType image/ico "access plus 2592000 seconds"
ExpiresByType image/icon "access plus 2592000 seconds"
ExpiresByType image/x-icon "access plus 2592000 seconds"
ExpiresByType text/css "access plus 2592000 seconds"
ExpiresByType text/javascript "access plus 2592000 seconds"
ExpiresByType text/html "access plus 7200 seconds"
ExpiresByType application/xhtml+xml "access plus 7200 seconds"
ExpiresByType application/javascript A2592000
ExpiresByType application/x-javascript "access plus 2592000 seconds"
ExpiresByType application/x-shockwave-flash "access plus 2592000 seconds"
</IfModule><img src="{{ image.thumb(200,200,{mode:'auto',quality:85}) }}" title="{{ image.title }}" alt="{{ image.description }}">