How can one ensure modular design and maintain performance when building a custom PHP framework?

To ensure modular design and maintain performance when building a custom PHP framework, one should follow best practices such as separating concerns, using autoloading, implementing caching mechanisms, and optimizing database queries. By organizing code into modules, classes, and functions, it becomes easier to maintain and scale the framework while ensuring optimal performance. 

// Example of using autoloading in a custom PHP framework
spl_autoload_register(function($class) {
    $file = str_replace('\\', '/', $class) . '.php';
    if (file_exists($file)) {
        require_once $file;
    }
});

Keywords

modular design performance optimization custom PHP framework PHP functions libraries

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