Sometimes when working with Drupal, you suddenly see this error: 
Allowed memory size of A bytes exhausted (tried to allocate B bytes)

Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 3669969 bytes) in ../public_html/includes/ on line 1987

How to handle this error? That error message tells you that Drupal needed more memory than PHP was allowed to give it. In this article, I will explain to you 3 methods to increase PHP memory size, pick one that you like:

1. Fix the error in Drupal 6/7 using php.ini file

You will probably see this error message when you install new modules/themes. By default, Drupal 6/7 allocates 64M (megabytes) of memory on your website and so, to fix this issue you need to increase memory limit to higher value (128MB is fine).

Here is the solution:

1. Connect to your Drupal web hosting using SSH/FTP connection

2. Check if there’s php.ini  file in root folder of your hosting

3. If it’s existing, open the file with text editor (notepad) and add the value  php_value memory_limit = "128M"

4. If there’s no  php.ini file in root folder, then you need to create one. Use notepate, wordpad or whatever can edit and save text file as .ini  file add the value  php_value memory_limit = "128M"

5. Save the file if check the error’s gone

(Note: remember to save file with name: php.ini, not php.ini.txt)

2. Increase PHP memory using .httaccess

Edit the .htaccess file in the Drupal root directory. Look for the section:

Override PHP settings. More in sites/default/settings.php

But the following cannot be changed at runtime

Now add the following line:
php_value memory_limit 64M
This method will only work if PHP is running as an Apache module.

3. Using settings.php

If Drupal is already installed, you can edit sites/default/settings.php. This method will affect only the site using this file.
Locate the PHP settings section and add the following line at the end of that section:
ini_set('memory_limit', '64M');

That’s all for today, hope you will solve this issue immediately after reading this!

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