A common error with Open Source Software like WordPress, Moodle, and Joomla is the php "Allowed memory size error." Increasing the memory limit is an easy solution. This memory_limit can be changed in the php.ini in the public_html folder in your hosting account. This error can creep up in your website during the normal development process. The following is an example of the error:

Fatal error: Allowed memory size of 268435465 bytes exhausted
(tried to allocate 280559520) in Unknown on line 0

This is due to php variable data being stored in the memory that is not cleared while the php scripts are running.

For those who code their own sites: Coders use the unset() function to clear variable data that is no longer needed; however, with open source software, you will not want to alter any code.

How to fix the "Allowed memory size Error"

The php memory resource can be increased in the php.ini located in the public_html. The following steps will explain how to set the php.ini to allow a larger amount of memory use.

  1. Login to your cPanel
  2. Go to the File Manager.

    Select the Web root (public_html/www) directory and click Go.

  3. Find the php.ini file in the public_html.

    Note! If you do not have a php.ini in your public_html files, you can have our tech support staff restore the php.ini to your public_html directory.

    Open the php.ini with the code editor.

  4. Find the following section in the php.ini file.

    max_execution_time = 30
    max_input_time = 60
    memory_limit = 128M

    Try increase the memory_limit value to 256M.

    If the php memory_limit is already at 256M, you can increase it to 512M.

    Save the changes.

  5. In order for your memory limit to take effect you will need to make the php.ini recursive.

    Important! Making the php.ini recursive is an important step. If you do not know how to do this, please see our article on Make the php.ini recursive in the .htaccess.

    Now visit the site. You should not see the "Allowed memory size" error anymore. If the error still shows on your website, there may be a setting within the software itself that is overriding the change or the php.ini in the public-html may be overriden by another setting elsewhere. If this is the case, you can contact our our tech support staff to have them look into the error further.

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2013-11-25 12:34 am
Hi. I have problem about memory limit. "Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 578 bytes) in /home/............... /admin/model/tool/export.php on line 352" appeared at my website when i import file import/export. I already changed memory_limit from 240M to 512M but still cannot add more option product.
11,156 Points
2013-11-25 9:46 am
As this is deep within your file structue, be sure that your php.ini is set to be recursive. You may see more information on this at the following:

Make the php.ini recursive in the .htaccess
n/a Points
2014-11-12 1:53 am

Thanks for your description of the solution to this problem. I've read a lot of explanations of how to fix this and this was the best and it worked, in part because of your admonition to make the php.ini recursive. As it happens this also solved the "white screen of death" WP editing screen problem I was having. It turns out that was, at least for me, a memory problem, contrary to what a lot of people were saying elsewhere. So a big thank you!

n/a Points
2014-12-22 12:53 pm

I agree, very helpful article, thanks so much for sharing

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