php 随机读取关键字

<?

/*

http://www.LsevenTT.com

/*

$key = file_get_contents( DIR."/ttkey.txt" );

$keyarr = explode("\r\n" , trim($key));//分割关键词已换行符分割

$keyline = count( $keyarr );//关键词行数

echo mt_rand(0,$keyline);

?>