Help with php fatal error

[Karabaja]

I am running a vbulletin forum. And we have a need sometimes to upload bigger files. Like 20mb. And this is what happens on bigger files.
I keep getting this error:

PHP Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 22179135 bytes) in /var/www/vhosts/mydomain.com/httpdocs/includes/class_core.php on line 1762

Could someone tell me please why is it exhausted and what could I do to get around this error. I've tried increasing limits but nothing seems to work.

[barns101]

Is the script working with an image? Apparently when you work on an image it is converted to a bitmap, and so a 20Mb JPEG file would take up a hell of a lot more memory when converted to its bitmap form.

[Karabaja]

No it is zip and rar files. I've increased the limit in php.ini to 128MB and it is working fine now. But that seems like too much to me.

[souravamant]

But as far as I know that was the easiest option (modifying the phpini file.)