WordPress Fatal error: Allowed memory size of x bytes exhausted (tried to allocate x bytes)

Whenever I wanted to edit the Pages of this blog, often times this kind of error messages comes up:

Fatal error: Allowed memory size of 88080384 bytes exhausted (tried to allocate 262144 bytes) in /home/wordpress/public_html/wp-includes/post.php on line 3075

I ask my host to solve this problem. It’s ok for a moment. After a few days, however, this error message comes up again at the same place i.e. whenever I wanted to open / edit PAGES.

Curious, I try to find out what’s the problem. And after some search, I find this answer and solution from wordpress forum:

It’s likely not a problem with your database, but rather a need for more PHP memory. Methods for increasing the amount of memory a PHP script may consume:

1. If you have access to your PHP.ini file, change the line in PHP.ini
If your line shows 16M try 32M:
memory_limit = 32M ; Maximum amount of memory a script may consume (32MB)

2. If you don’t have access to PHP.ini try adding this to an .htaccess file:
php_value memory_limit 32M

3. Try adding this line to your wp-config.php file:
Increasing memory allocated to PHP
define(‘WP_MEMORY_LIMIT’, ’32M’);

4. Talk to your host.

If you’re confused with point 1, 2 and 3, just do step no. 4: Talk to Your Host.

A similar answer can also be found in this thread:

I host with MediaTemple, so they let me change my own PHP.INI file. Some hosts don’t, and will limit your memory limit allowed for php calls. If you can edit your php.ini, add this.

memory_limit 32M

Then, add this to your .htaccess file.

php_value memory_limit 32M

This fixed that error for me.

Again, if you’re confused, just contact your host.