How to modify php's memory_limit limit

When running a PHP program, you usually encounter the error "Fatal Error: Allowed memory size of xxxxxx bytes exhausted". This means that the PHP script uses too much memory and exceeds the maximum allowed memory set by the system.

To solve this problem, you first need to check whether your program has allocated too much memory. If there is no problem with the program, you can increase PHP's memory limit (memory_limit) through the following methods.

Check the memory limit value of php

In order to check this value, you need to create an empty php file, such as view-php-info.php. Then paste the following code inside.

<?php phpinfo(); ?>

Put this script on your web server and call it in your browser. At this time you can see the information about your PHP environment configuration, part of which is about "memory_limit", as shown below:

Note: You can use this method to view other parameter settings of PHP, not only It's memory_limit

How much should memory_limit be set to?

This completely depends on the requirements of your application. For example, WordPress requires 32MB to run the core code. Drupal 6 requires this value to be at least 16MB, and recommends setting it to 32MB. If you install a lot of plug-ins, especially those that require image processing, you may need 128MB or more memory.

How to set memory_limit

Method 1: php.ini

The simplest or most common method is to modify php.ini

1) First find the php.ini file that is effective for your website because there are many places where it can be set PHP parameters, finding the correct configuration file and making changes is the first step. If you created a php file using the above method to view its configuration parameters, you can find the "Loaded Configuration File" item. The following is an example:

For Linux users, you can execute "php -i | grep Loaded Configuration File" to find the corresponding configuration file. For Windows users, you can try modifying php.ini in your php installation directory.

2) Edit php.ini In php.ini, find the "memory_limit" item. If not, you can add this parameter yourself at the end of the file. The following are some setting examples

memory_limit = 128M ; //可以将128M改为任何你想设置的值

Save the file

3) Restart the web server. If the web server uses Apache, execute:

httpd restart

In some cases, you may not be allowed to modify php.ini privately. For example, if you purchased a virtual hosting service, but your service provider does not allow you to modify this file. Then, you may want to consider other methods to increase the value of memory_limit.

Method 2: .htaccess

Note: This method only takes effect when php is executed with the Apache module. Find the ".htaccess" file in the root directory of your website. If you don't have one, you can create one yourself. Then put the following configuration into it:

php_value memory_limit 128M ; //可以将128M改为任何你想设置的值

Method 3: Modify the memory settings of php during runtime

Just add the following command line to your php code.

ini_set('memory_limit','128M');

Memory_limit modification failed

If you use a virtual host, there may be a failure to modify the memory_limit value. You need to contact your service provider to see how to deal with this. Usually they limit the maximum value that can be set or do not allow you to modify it at all. If their environment really cannot meet your requirements, then you may want to consider changing to another hosting provider.