PHP 函数extension_loaded();

extension_loaded—检查一个扩展是否已经加载

例如：

<?phpif (!extension_loaded('gd')) {    if (!dl('gd.so')) {        exit;    }}?>

是否加载 gd 库扩展

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(PHP 4, PHP 5)

get_loaded_extensions—返回所有编译并加载模块名的 array

array get_loaded_extensions ([ bool $zend_extensions = false ] )