PHP如何通过开启Opcache来提高性能

在开启Opcache之前，我们先了解一下什么是Opcache:

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OPcache 通过将 PHP 脚本预编译的字节码存储到共享内存中来提升 PHP 的性能， 存储预编译字节码的好处就是 省去了每次加载和解析 PHP 脚本的开销。
PHP 5.5.0 及后续版本中已经绑定了 OPcache 扩展。 对于 PHP 5.2，5.3 和 5.4 版本可以使用 » PECL 扩展中的 OPcache 库。

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Spring Boot的三种启动方式

Spring Boot有以下三种启动方式，最后一种我们可以很好的设置不同环境使用不同的配置文件。

1.IDE 运行Application这个类的main方法

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package com.dameiweb.girl;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class GirlApplication {

	public static void main(String[] args) {
		SpringApplication.run(GirlApplication.class, args);
	}
}

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Java里有哪些语法糖

语法糖（Syntactic Sugar），也称糖衣语法，指在计算机语言中添加的某种语法，这种语法对语言本身功能来说没有什么影响，只是为了方便程序员的开发，提高开发效率。说白了，语法糖就是对现有语法的一个封装。

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Java出现错误Implicit super constructor ** is undefined for default constructor. Must define an explicit constructor

公司开展新的项目，要求使用Java，给一个月的学习时间。(南京一些比较大的公司也开始转向Java，语言环境发了改变，学习Java也是大势所趋。2018年1月26日修改)，只好开始学习Java！说好有系统的培训，结果我现在在自学！在学习java的时候，遇到了下面的问题：

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Implicit super constructor People() is undefined for default constructor. Must define an explicit constructor

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PHP出现Deprecated Automatically populating is deprecated and will be removed in a future version

本地新搭建的PHP环境，出现下面的问题：

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Deprecated Automatically populating $HTTP_RAW_POST_DATA is deprecated and will be removed in a future version. To avoid this warning set 'always_populate_raw_post_data' to '-1' in php.ini and use the php://input stream instead. in Unknown on line 0
Warning: Cannot modify header information - headers already sent in Unknown on line 0

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PHP出现以下错误Cannot find module (IP-MIB)

查看PHP版本的时候出现下面的问题：

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php -v

MIB search path: c:/usr/share/snmp/mibs
Cannot find module (IP-MIB): At line 0 in (none)
Cannot find module (IF-MIB): At line 0 in (none)
Cannot find module (TCP-MIB): At line 0 in (none)
Cannot find module (UDP-MIB): At line 0 in (none)
Cannot find module (HOST-RESOURCES-MIB): At line 0 in (none)
Cannot find module (SNMPv2-MIB): At line 0 in (none)
Cannot find module (SNMPv2-SMI): At line 0 in (none)
Cannot find module (NOTIFICATION-LOG-MIB): At line 0 in (none)
Cannot find module (UCD-SNMP-MIB): At line 0 in (none)
Cannot find module (UCD-DEMO-MIB): At line 0 in (none)
Cannot find module (SNMP-TARGET-MIB): At line 0 in (none)
Cannot find module (NET-SNMP-AGENT-MIB): At line 0 in (none)
Cannot find module (DISMAN-EVENT-MIB): At line 0 in (none)
Cannot find module (SNMP-VIEW-BASED-ACM-MIB): At line 0 in (none)
Cannot find module (SNMP-COMMUNITY-MIB): At line 0 in (none)
Cannot find module (SNMP-FRAMEWORK-MIB): At line 0 in (none)
Cannot find module (SNMP-MPD-MIB): At line 0 in (none)
Cannot find module (SNMP-USER-BASED-SM-MIB): At line 0 in (none)
Cannot find module (SNMP-NOTIFICATION-MIB): At line 0 in (none)
Cannot find module (SNMPv2-TM): At line 0 in (none)
PHP 7.0.12 (cli) (built: Oct 13 2016 11:04:07) ( NTS )
Copyright (c) 1997-2016 The PHP Group
Zend Engine v3.0.0, Copyright (c) 1998-2016 Zend Technologies

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