Posted by Rex in PHP programming

This error message can spring up in a previously functional PHP script when the memory requirements exceed the default 8 MB limit. However, do not fret because this is an easy problem to overcome.
To change the memory limit for one specific script, include a line such as this at the top of the script:

ini_set("memory_limit","12M");

The 12M sets the limit to 12 megabytes (12582912 bytes). If this does not work, keep increasing the memory limit until your script fits or your server squeals for mercy.

You can also make this a permanent change for all PHP scripts running on the server by adding a line such as this to the server’s php.ini file:

memory_limit = 12M

Keep in mind that a huge memory limit is a poor substitute for good coding. A poorly written script may inefficiently squander memory which can cause severe problems for frequently executed scripts. However, some applications are run infrequently and require lots of memory like importing and processing a large data file.