How to adjust memory in php

PHP is a widely used open source server-side scripting language mainly used for creating dynamic web pages. When using PHP, you may face the problem of insufficient memory. At this time, we need to adjust the memory. This article will introduce how to modify PHP's memory to improve the performance of scripts.

1. Determine the PHP.ini file

First, you need to find the location of the PHP.ini file. On many Linux distributions, it is usually located in the /etc/php.ini directory, while on Windows systems it is usually located in the \php.ini folder of the PHP installation directory. If the file cannot be found, execute the phpinfo() function and look for the information returned by the function. The specific location can be found in the Loaded Configuration File of the returned information.

2. Modify the memory limit

In the PHP.ini file, you can search for the "memory_limit" keyword. This keyword defines the maximum amount of memory that a PHP script can use. By default, this limit is usually set to 128MB. This can be changed to a higher value, such as 256MB, to allow the PHP script to allocate more memory.

memory_limit = 256M

If you want to completely disable memory limits, set memory_limit to "-1".

memory_limit = -1

Note that setting the memory limit too high may cause the system to crash or the script to run slower.

3. Modify other performance parameters

There are many other performance-related parameters that can be modified in the PHP.ini file. For example, you can adjust the values ​​of max_execution_time (the maximum time a script is allowed to execute) and max_input_time (the maximum time it takes to receive input from the client).

max_execution_time = 60
max_input_time = 60

Alternatively, the Zend OPCache extension can be enabled or disabled to improve performance. This extension can be enabled using the following parameters:

zend_extension=opcache.so
opcache.enable=1
opcache.memory_consumption=128
opcache.interned_strings_buffer=8
opcache.max_accelerated_files=4000
opcache.revalidate_freq=60

4. Restart the PHP process

##After modifying the PHP.ini file, the PHP process needs to be restarted. In Linux systems, you can use the following command to restart PHP:

sudo service php-fpm restart

On Windows systems, you need to modify the memory limit through programs such as XAMPP, WAMP or MAMP.

5. Test performance

After modifying PHP’s memory limit, you must test its performance. You can use benchmarking tools such as ApacheBench to test the performance of your scripts to determine if further optimization is needed. To determine that the script is using the correct memory limit, you can put the following code at the top of the script:

ini_set('memory_limit', '256M');

6. Summary

Changing the PHP memory limit is One of the fastest ways to improve script performance. However, also be careful to set the correct limits to avoid taking up too much memory or crashing your system. Additionally, other performance-related parameters should be reviewed and modified. Finally, test the script's performance to make sure it's working as expected.

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