php extension check and load

/**

*List all loaded extensions and the functions they contain

*/

$exts = get_loaded_extensions();

foreach ($exts as $ext) {

    $funs = get_extension_funcs($ext);

    echo "当前扩展名称:" . $ext . "及其包含的函数
";

    foreach ($funs as $fun) {

        echo "

$fun

";

    }

}

// Example loading an extension based on OS  

if (!extension_loaded('sqlite')) {

    if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {

        dl('php_sqlite.dll');

    } else {

        dl('sqlite.so');

    }

}

// Or, the PHP_SHLIB_SUFFIX constant is available as of PHP 4.3.0  

if (!extension_loaded('sqlite')) {

    $prefix = (PHP_SHLIB_SUFFIX === 'dll') ? 'php_' : '';

    dl($prefix . 'sqlite.' . PHP_SHLIB_SUFFIX);

}

?>