PHP常用的系统回调
常用的回调注册函数有：set_error_handler：如果你想在程序发生错误时想做点什么处理就用这个set_exception_handler：如果你想在程序发生异常时想做点什么处理就用这个register_shutdown_function：当程序结束时想做点什么处理就用这
mysql中find_in_set()函数的使用
Returns a value in the range of 1 to N if the string str is in the string list strlist consisting of N substrings. A string list is a string composed of substrings separated by ， characters. If the first argument is a constant string and the second is a column of type SET， the FIND_IN_SET function is optimized to use bit arithmetic. Returns 0 if str is not in strlist or if strlist is the empty string. Returns NULL if either argument is NULL. This function does not work properly if the first argument contains a comma character.
解决PHP的MySQL的UTF-8问题
这里有一个你应该做的操作列表，以便让PHP+MySQL使用UTF-8:。CREATETABLEtable_name->mb_send_mail->mb_strlen->mb_strpos->mb_strrpos->mb_substr->mb_strtolower->mb_strt