PHP学习笔记：注意事项
笔记
注意事项：
一，注意不要漏了分号（从ASP转来最易有此毛病）
二，注意不要漏掉变量前的$
三，使用SESSION时注意不要遗漏了SESSION_START();
如果发生错误可以采用以下方法
一，如果SQL语句出错，就注释了然后输出SQL语句，注意也要注释掉后续的SQL语句。
二，如果变量为空，大多是没有传递到位，输出变量检查一下，检查一下表单的id和name。
三，如果数据库链接错误，检查是否打开了MYSQL和是否遗漏了连接语句。
四，注意缩进，排除括号不匹配的错误
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