php 扩充检查并加载

<?php/** *列出所有加载的扩展及其包含的函数 */$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<br>";	foreach ( $funs as $fun ) {		echo "<li>$fun</li>";	}}// 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 );}?>