What should I do if I have limited memory in PHP?

This article mainly introduces the memory limit in PHP What should I do? Interested friends under the reference, I hope to be helpful to everyone.

Yesterday, in the server-side debugging program, the site suddenly popped Fatal error:allowed memory size ..., when a face, but soon returned to normal, not only my curiosity, Baidu the next reason, It turns out that a single script is using too much memory. The following articles are reproduced.

In Running a PHP program, you will typically encounter "Fatal error:allowed memory size of xxxxxx bytes exhausted" error, which means that the PHP script uses too much RAM, and exceeds the maximum allowable memory set by the system. To solve this problem, you need to check whether your program is allocating too much memory, and you can increase the PHP memory limit (memory_limit) by a few methods if there is no problem with the program.

Check PHP for Memory limit values

To view this value, you need to create an empty PHP file, such as view-php-info.php. Then paste the code inside.

<?php phpinfo ();?>

Put the script on your PHP host and call it in the browser. At this point you can see your PHP environment configuration information, some of which are about "memory_limit", such as:

Note: You can use this method to view PHP's other parameter settings, not just Memory_limit

How much should the Memory_limit be set?

This depends entirely on the requirements of your application. such as WordPress, running the core code needs 32MB. Drupal 6 requires a minimum value of 16MB and is recommended to be set to 32MB. If you install a lot of plugins (plugins), especially those for image processing, you may need 128MB or higher memory.

How to set Memory_limit

Method 1:php.ini

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

1. First find the php.ini file that takes effect on your site

   Since there are multiple places where PHP parameters can be set, finding the correct configuration file and making changes is the first step. If you have built a PHP file in the above method to see its configuration parameters, you can find the "Loaded configuration file", the following is an example:

   For Linux users, you can do this by executing the Php-i | grep Loaded configuration File "to locate the corresponding profile. While Windows users, you can try to modify the php.ini in your PHP installation directory.

2. Edit PHP.ini

   In PHP.ini, find the "Memory_limit" item, and if not, you can add this parameter yourself at the end of the file. Here are some examples of settings

   Memory_limit = 128M; You can change the 128M to any value you want to set

   Save File

3. Restarting the Web server

   If the Web server is using Apache, execute:

   httpd restart

In some cases, you may not be allowed to modify php.ini privately. For example, if you purchase a web hosting service, your provider does not allow you to modify the file. Then, you may want to consider other ways to increase the value of the Memory_limit.

Method 2:. htaccess

Note: This method only takes effect if PHP is executed with the Apache module.

Find the ". htaccess" file at the root of your website, and if not, you can create one yourself. Then put the following configuration into it

Php_value Memory_limit 128M; You can change the 128M to any value you want to set

Method 3: Modify the PHP memory settings at run time

Add the following command line to your PHP code.

Ini_set (' Memory_limit ', ' 128M ');

Memory_limit modification failed

If you use a virtual host, it is possible that the Memory_limit value modification fails. This need to contact your service provider to see how to handle, usually they limit the maximum value can be set or do not allow you to modify at all. If their environment really does not meet your requirements, then you may want to consider changing a host service provider.