Understanding Thread Safety in PHP
In PHP, you may encounter the terms "thread safe" and "non-thread safe" in relation to available PHP binaries. This article aims to explain the meaning and implications of these terms.
Multi-Threaded Environments
Web servers can handle incoming requests in different ways. One common approach is to use threads, where each incoming request is assigned a dedicated thread.
PHP's Role in Web Servers
PHP is not directly involved in handling HTTP requests; web servers like Apache HTTP are responsible for that. To integrate PHP with Apache, a module like mod_php is used, which embeds PHP within the web server.
Thread Safety and mod_php
When Apache uses threads (Worker MPM), PHP must be thread-safe to avoid issues when operating within that environment. This means that PHP code and data structures should be designed to handle concurrent execution by multiple threads.
PHP Thread Safety Debate
PHP's thread safety is a contentious issue. While it is theoretically possible, there are concerns about its reliability and potential for unexpected behavior.
Use Non-Threaded MPM in Practice
Given the uncertain nature of PHP thread safety, it is generally advisable to avoid it in web server environments. Apache's prefork MPM (which does not use threads) is a safer option in combination with PHP.
Other Scenarios
Thread safety is not relevant when using PHP in a command-line environment or when communicating with PHP via FastCGI or other interprocess communication mechanisms (e.g., nginx, lighttpd).
Which Binary to Use?
The choice between thread-safe and non-thread-safe PHP binaries is primarily based on whether you are using PHP in a multi-threaded environment. For most practical applications, it is recommended to use the non-thread-safe version unless you have a specific need for thread safety.
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