array ( 0 => 'index.php', 1 => 'PHP Manual', ), 'head' => array ( 0 => 'UTF-8', 1 => 'zh', ), 'this' => array ( 0 => 'function.extension-loaded.php', 1 => 'extension_loaded', ), 'up' => array ( 0 => 'ref.info.php', 1 => 'PHP 选项/信息 函数', ), 'prev' => array ( 0 => 'function.dl.php', 1 => 'dl', ), 'next' => array ( 0 => 'function.gc-collect-cycles.php', 1 => 'gc_collect_cycles', ), 'alternatives' => array ( ), 'source' => array ( 'lang' => 'zh', 'path' => 'reference/info/functions/extension-loaded.xml', ), ); $setup["toc"] = $TOC; $setup["toc_deprecated"] = $TOC_DEPRECATED; $setup["parents"] = $PARENTS; manual_setup($setup); ?>
(PHP 4, PHP 5, PHP 7, PHP 8)
extension_loaded — 检查一个扩展是否已经加载
extension
扩展名称,大小写不敏感。
你可以用 phpinfo() 来查看一系列扩展名称,而在 CGI
或 CLI
的 PHP 版本里你可以使用 -m 参数来列出所有有效的扩展:
$ php -m [PHP Modules] xml tokenizer standard sockets session posix pcre overload mysql mbstring ctype [Zend Modules]
示例 #1 extension_loaded() 示例
<?php
if (!extension_loaded('gd')) {
if (!dl('gd.so')) {
exit;
}
}
?>