freeCodeCamp/guide/chinese/php/basic-syntax/index.md

title	localeTitle
Basic Syntax	基本语法

基本语法

PHP脚本可以放在文档中的任何位置。

PHP脚本以<?php开头，以?>结尾

下面，我们有一个简单的PHP文件示例，其中一个PHP脚本使用内置的PHP函数“echo”来输出文本“Hello World！”。在网页上

````

我的第一个PHP页面

The output of that would be : 

我的第一个PHP页面

你好，世界！

#### Note: PHP statements end with a semicolon (;). 
 
 # Comments in PHP 
 
 PHP supports several ways of commenting: 

# PHP Case Sensitivity 
 
 In PHP, all keywords (eg if, else, while, echo, etc.), classes, functions, and user-defined functions are NOT case-sensitive. 
 
 In the example below, all three echo statements below are legal (and equal): 

### However; all variable names are case-sensitive. 
 
 In the example below, only the first statement will display the value of the $color variable (this is because $color, $COLOR, and $coLOR are treated as three different variables): 

````