How To Increase PHP Memory Limit

Increase PHP Memory Limit

In this tutorial, we will show you how to increase the PHP memory limit on a Linux server. For those of you who didn’t know, PHP is a popular open-source programming language that is widely used to develop dynamic web applications. In some cases, PHP scripts may require more memory than the default memory limit set in the PHP configuration. This can cause errors and affect the performance of the website. Increasing the PHP memory limit is a simple process that can help to avoid memory-related errors and improve the performance of your website

This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple and assumes you are running in the root account, if not you may need to add ‘sudo‘ to the commands to get root privileges.


  • A server running one of the following operating systems: Debian-based or RHEL-based.
  • It’s recommended that you use a fresh OS install to prevent any potential issues.
  • SSH access to the server (or just open Terminal if you’re on a desktop).
  • An active internet connection.
  • A non-root sudo user or access to the root user. We recommend acting as a non-root sudo user, however, as you can harm your system if you’re not careful when acting as the root.

Increase PHP Memory Limit

Step 1. First, let’s start by ensuring your system is up-to-date.

sudo dnf clean all
sudo dnf update

Step 2. Increasing the PHP Memory Limit.

To increase the PHP memory limit, you can modify the php.ini file. This file is the main configuration file for PHP. First, locate the php.ini file on your system. You can do this by running the following command in the terminal:

php -i | grep php.ini

After you have found the php.ini file, you can edit it with your favorite text editor and look for the following line:

memory_limit = 128M

Change the value to the desired limit. For example, to increase the limit to 512 MB, use:

memory_limit = 512M

Save and close the file, then restart the Apache web server to make the change effect:

sudo systemctl restart apache2

Replace apache2 with the name of your web server if you are using a different one.

For additional resources on installing PHP, read the post below:

Step 3. Checking the Current PHP Memory Limit.

To verify that the PHP memory limit has been increased, you can create a PHP script that outputs the current memory limit. You can check by creating a file called info.php in /var/www/html/ with the following content:


Save and close the file, then visit the following URL in your web browser:


How To Increase PHP Memory Limit

Congratulations! You have successfully increased the PHP memory. Thanks for using this tutorial to change the PHP memory limit Linux system. For additional help or useful information, we recommend you check the official PHP website.

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r00t is a seasoned Linux system administrator with a wealth of experience in the field. Known for his contributions to idroot.us, r00t has authored numerous tutorials and guides, helping users navigate the complexities of Linux systems. His expertise spans across various Linux distributions, including Ubuntu, CentOS, and Debian. r00t's work is characterized by his ability to simplify complex concepts, making Linux more accessible to users of all skill levels. His dedication to the Linux community and his commitment to sharing knowledge makes him a respected figure in the field.
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