php中的错误级别
在php编程过程中，大家一定会遇到或多或少的错误提醒，也正是这些错误提示，指引我们编写更加干净的代码，今天先写出我们主要列出的错误类型，先挖坑，写关于php错误与异常的相关知识，慢慢填坑。
Deprecated最低级别错误，程序继续执行
Notice 通知级别的错误 如直接使用未声明变量，程序继续执行
Warning 警告级别的错误，可能得不到想要的结果
Fatal error 致命级别错误致命级别错误，程序不往下执行
parse error 语法解析错误，最高级别错误，连其他错误信息也不呈现出来
E_USER_相关错误 用户设置的相关错误
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