Library Loading¶
PHP has a modular structure, which allows it to load extensions. The extensions may be part of PHP at compilation time, and always available: this is the case for core, or string.
On the other hand, some extensions are loaded dynamically, with the dl() function. This is done during execution. It usually has an impact on performance, and security, and was restricted to be used only in command line, not on web servers.
<?php
if (!extension_loaded('sqlite3')) {
dl('sqlite3.so');
}
?>
Related : Extensions
