The basic use of this article includes ：
- php Conventional grammar
- date,number,array And so on
The general syntax of programming language is easy to understand , Almost the same . If you're a programmer good at other interpretive languages , Migrate to php It's almost effortless . And vice versa .
And this is the process of migration , Personally, I don't think it's a learning process , It's a process of use . because , We just have one more tool , form , There's no improvement in the nature of programming . I can't talk about it at my own level , Now get into basic use .
Reference book or cheatsheet
- What is? ‘cheatsheet'
- php cheatsheet
Print hello world
echo "hello world";
$vars = "123";
// Constant PI
- There is no dollar sign before the constant （$）;
- Constant can only be used define() Function definition , Instead of using assignment statements ;
- Constants can be defined and accessed anywhere, regardless of the scope of the variable ;
- Once a constant is defined, it cannot be redefined or undefined ;
- The value of a constant can only be scalar .
- while/do while
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