PHP memory_limit – understanding and increasing this setting

PHP memory_limit is per-script, just as a highway’s speed limit is per-vehicle. For example, although PHP’s memory limit may be set high to 1GB, that does not mean that scripts will pile up to use that 1GB. Let’s take a quick look at understanding PHP’s memory_limit setting.   PHP memory_limit is a per-script setting PHP.net’s […]

Memcache PHP Extensions for Memcached Caching Daemon

Memcached (Memcache Daemon) is a caching daemon designed especially for dynamic web applications to decrease database load by storing objects in memory. It is commonly used to speed up dynamic database-driven websites by caching data and objects in server memory to reduce the number of times the data source must be read. Memcached is free […]

PHP performance: oPcache Control Panels

OPcache is a PHP extension that improves PHP performance by storing precompiled script bytecode in shared memory, thereby removing the need for PHP to load and parse scripts on each request. The extension is built-in for PHP 5.5+. If you are looking to improve PHP performance, the first step should be to use PHP 7.4+, […]

PHP-FPM tuning: Using ‘pm static’ for max performance

Let’s take a very quick look at how best to set up PHP-FPM for high throughput, low latency, and more stable use of CPU and memory. By default, most setups have PHP-FPM’s PM (process manager) string set to dynamic and there’s also the common advice to use ondemand if you suffer from available memory issues. However, let’s compare the two management […]

Set PHP realpath_cache_size ‘correctly’

Back in 2012 I started enabling PHP realpath_cache_size and realpath_cache_ttl for the performance benefits. At the time, I followed settings I found here (has since been deleted). It bugged me that I was blindly setting the size of the cache without actually knowing how much storage was being used. In this post I will show you how to […]

PHP Benchmarks: OPcache vs OPcache w/ Performance Tweaks

A few weeks ago, I wrote a short article highlighting GUI solutions for monitoring and controlling PHP OPcache. We all know that enabling PHP OPcache provides massive performance gains (see benchmark graph at the end of the article). In addition, since PHP 5.5, OPcache is now enabled by default. With these facts in mind, is […]

PHP 8 Compatibility Check and Performance Tips.

PHP 7 was first released back on 03 Dec 2015. Yes, I’m sure, it’s been around a while! The PHP team encouraged upgrading to PHP 7, hailing its improvements such as being twice as fast, consistent 64-bit support, removal of old and unsupported SAPIs and extensions, improved fatal error resistance, to name a few. A […]

PHP Performance: Additional CPU cores vs Faster CPU cores

Some time ago, I received an email from a client experiencing slow performance issues with a LEMP (Linux, Nginx, MySQL, and PHP webserver). During a full audit, I found that the server’s load average was pretty low (see above screenshot). However, the website was indeed very slow. There were some misconfigurations, but one of the […]

PHP 5.6 EOL (End of Life) – PHP 7 Compatibility Check

Summary: PHP 7.3 benchmark, how to check your PHP scripts/apps for PHP 7 compatibility, upgrade to PHP 7 ASAP, confirm OpCache is enabled/monitored and some php.ini optimization tweaks.   PHP 5.6 and PHP 7.0 to hit EOL this year! reached EOL last Year! (2018) PHP 5.6 was first released back in 2014, with alpha 1 released in January 2014. […]

How to upgrade to PHP 7 on RHEL/CentOS

TL;DR = Upgrade to PHP 7 using Remi’s RPM repository – PHP Configuration wizard. Red Hat Enterprise Linux (RHEL) is a Linux distribution developed by Red Hat targeted toward the commercial market. Red Hat uses strict trademark rules to restrict free re-distribution of its officially supported versions, but still freely provides its source code. Third-party derivatives […]