上传后即时创建大拇指

Question

Just wondering what is better:

Create thumbs on the fly:

• [+] easy to create numerous thumb sizes
• [+] easy to maintenance
• [-] wasting cpu by sending images thru PHP

Create thumbs after user upload:

• [+] saving server cpu
• [-] very painful to maintenance and painful to new add thumb size
• [-] maybe the thumbs are never shown.

Any suggestions? Should i really worry about CPU? Let's say I have thousands of images, and every image needs thumb in 5+ different sizes. Maybe even more sizes in future.

Answer 1

[-] wasting cpu by sending images thru PHP

You don't have to generate the same image again and again on each request!
Generate the image the first time it's requested, then put it in a place where it will be served by the web server the next time. A simple implementation for this using mod_rewrite:

RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ generateImage.php?image=$1 [QSA,L]