PHP 5.2 compatibility fixes

[siimsoni]

No description provided.

[iwyg]

Instead of version php comparison, you could just check if the function exists. Don't know which one is better, but I'd prefer feature testing over version sniffing.

[siimsoni]

Good point. I will update to check if the function exists for header_remove() fallback, but the finfo_open() in 5.2 provided by PECL in not equivalent to finfo_open() in PHP 5.3.

[designermonkey]

I was under the impression we didn't support 5.2 any more? @brendo?

[iwyg]

If the website's still a valid resource for information, then "PHP 5.2 or above" is the min. requirement.

[brendo]

PHP5.2 is still supported for 2.3 :(

Thanks for the fixes @slimson. You may want to look at using this for your PHP 5.3 check though, just for consistency everywhere else where do a version check rather than a feature check :)

Also, this pull request needs to be made against integration, not master.