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Memory Limit in PHP

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11,257 Points
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Last Modified:
Loganathan Natarajan
LAMP Developer, PHP Expert, Web Developer
Some times, we may experience memory related issues like Fatal error: Allowed memory size of 567745 bytes exhausted or even out of memory. These errors occur because of limiting the memory to utilize more from the web server. It is a common issue in the shared hosting type web sites.

To resolve this issue, you may need to change the memory_limit variable value in the php.ini. As default it may be 8MB or 16MB. It can be increased temporarily as 20MB or depending on the size of your web site

You can view the memory allotted to use for your site by creating phpinfo.php file with

      echo phpinfo();

just look at the memory_limit variable how much it is allotted. now you can modify the memory_limit with the following options:

Option -- 1 - Change the memory_limit from php.ini
On your server, edit the php.ini file and find the memory_limit variable configuration and change the value. After the change, you need to restart the server. This change will applicable as entire sites running on the server.

If you are using shared hosting, you cannot access the php.ini file do this change.

Option -- 2 - Change the memory_limit using .htaccess
You can also do this change temporarily using .htaccess file placing on your site root directory

php_value memory_limit 20M

place this file on the root directory of your site and check the memory value gets updated.

Option -- 3 - Change the memory_limit in your php file script
It is a custom change on your php script for your use to achieve the purpose. You can just specify the memory limit amount and use it on your site.

To do this, your php might have been compiled with the --enable-memory-limit configure option


< & your php code follows &>

It is better to clear all the variables after we don't need them any more in the site using unset($variable).
LVL 29

Expert Comment

reviewed rdivilbiss PE

Expert Comment

by:Eduardo Fuerte
Very good!

Our site is actually using 128M and due a large download using Codeigniter force_download it's needing 1024 MB...
LVL 36

Author Comment

by:Loganathan Natarajan
it's needing 1024 MB...

it depends on your computer RAM, system configuration etc.,

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