What should I do if there is a memory limit in php?

This article mainly introduces what to do if the memory is limited in php? Interested friends can refer to it, I hope it will be helpful to everyone.

Yesterday, when debugging the program on the server side, the website suddenly popped up Fatal Error: Allowed memory size..., I was confused at the time, but it soon returned to normal, not only My curiosity was aroused, and Baidu investigated the cause. It turned out that it was caused by a single script using too much memory. The following is a reproduced article.

When running a PHP program, you will usually encounter the error "Fatal Error: Allowed memory size of xxxxxx bytes exhausted", which 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 are no problems 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 PHP host and call it in the 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 Let’s check other parameter settings of php, not just 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 commonly used method is to modify php.ini

1. First find the php.ini file that is effective for your website

   Since there are multiple places where you can set php parameters, find the correct configuration file and proceed Change 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 find the corresponding configuration file by executing "php -i | grep Loaded 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 The tail adds this parameter by itself. 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 as the Apache module.

Find the ".htaccess" file in the root directory of your website. If not, 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');

Failed to modify memory_limit

If you use a virtual host, there may be a failure to modify the value of memory_limit. 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.

Related recommendations:

Detailed explanation of PHP memory release and garbage collection

Detailed explanation of PHP memory leak

php memory management detailed explanation

The above is the detailed content of What should I do if there is a memory limit in php?. For more information, please follow other related articles on the PHP Chinese website!