trstr(''aaaaaaAbaaa aaaa aaaaaaaaaboxccccccccccccboxccccccccccc'',''box'')."<br>\n";
//输出boxccccccccccccboxccccccccccc
// 有两个关键字时, 遇到第一个停止.
echo strstr(''Subscrtibe our to free newsletter about New Freew to'',''to'')."<br>\n";
//输出to free newsletter about New Freew to
?>