The Linux environment installs Lua, but class_exists in PHP evaluates to false, how do I troubleshoot?

luaphp

出错的代码如下，class_exists("Lua",false)为false，我在linux下输入lua，能够调用lua，请问我该如何进一步排查：public function getTableData($tableName) {    $gameTable = array();    if (class_exists("Lua",false)) {        $lua = new Lua ();        $lua->eval ( <<< code="">

< code="">CODE
);

< code=""> $tablePath = GAME_LUA_PATH . "clientData/?.lua;"; $tablePath .= GAME_LUA_PATH . "serverData/?.lua;"; $gameTable = $lua->getTable ( $tablePath, $tableName ); }else { exit("lua has not been installed"); } return $gameTable;}

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