自罚一杯-PHP基础（一）
hi
懒癌是最可怕的癌了吧，在即将迎来本命年时，给自己定下每天必干的几件成习惯的事情，望不再鸽！！
php是我一直在学习的东西，但总以为php简单，难点在需要掌握大量的相关知识，其实并不完全对，php也是有算法好吧，php也值得认真对待，既然决定学了，拿点样子出来啊，是男人吧。
1、PHP
一、PHP基础（一）
1.1 简介
PHP=Hypertext Preprocessor=超文本预处理语言；
脚本语言；
执行效率高（就是速度快）；
可大可小，大网站往往不只使用它一种语言，比如淘宝，前p后j好像是；
俗语：电子商务三大宝——上线，支付宝，php；
版本问题：目前最新为PHP 7.0.0；我一般还在用PHP5。
环境问题：windows各种集成环境，wamp，xampp，或者自行百度自助搭建；linux我前面的博文中有说，其实就几行命令的问题，当然系统版本不同，可能命令有所不同，大同小异，举一反三~
1.2 基础语法
--PHP标记
；
天生为html而生，嵌套其中；
一般在编译器中，不要写?>，因为容易在结束标记前有不希望输出的空格等内容；直接删掉就行了，会自动结束的；
--从HTML中分离
aaaaaaaaa
bbbbbb
一般情况下，php标记能很好的从HTML中分离，但上述例子情况例外——使用条件的高级分离方法；
当解释器遇到未完成的条件语句时，会跳过标记寻找相应的东西（比如else）；
适用于输出大段文本，比echo等更有效率。
另外，开始结束的标记也可以用其他的，但推荐
--其他
注释：//单行，/*多行；
指令分隔符：分号
把憋了一个月的电影去看了，时间挤啊挤，才有a杯那么一点，明天继续！
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