php有关函数

<?php/** * @author zhang * @copyright 2013 *///trim(string, charlist);  //删除字符串首尾空白符和其他预定义字符$str='zhang,+;';echo trim($str, ';+,');// zhangecho time();//返回当前时间到1970的秒数echo date('Y-m-d H:i:s', time()); //时间格式化//explode 按特定字符划分字符串为数组list($first_name, $second_name) = explode(':','zhang:hua'); echo $first_name . ' ' . $second_name;//implode 按特定字符连接数组元素，输出字符串echo implode(',', explode('#','zhang#hua'));//array_keys//in_array?>