Are class definitions parsed only once and then stored in memory regardless of sessions?

Class definitions in PHP are parsed and stored in memory once per session. If you want to ensure that a class definition is only parsed once and stored in memory regardless of sessions, you can use PHP's autoloading feature along with a caching mechanism. By implementing a caching mechanism, you can store the parsed class definitions in a persistent storage like a file or a database, and then load them from the cache instead of re-parsing them for each session. 

// Autoloader function to load classes
spl_autoload_register(function ($class) {
    $cacheFile = 'class_cache/' . $class . '.php';
    
    if (file_exists($cacheFile)) {
        require_once $cacheFile;
    } else {
        // Parse and define the class
        require_once 'path/to/your/class/' . $class . '.php';
        
        // Cache the parsed class definition
        file_put_contents($cacheFile, php_strip_whitespace('path/to/your/class/' . $class . '.php'));
    }
});

Keywords

PHP class definitions parsing memory sessions

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