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第1篇:PHP开发环境搭建与第一个程序

  • 2026-04-17 17:48:41
第1篇:PHP开发环境搭建与第一个程序

PHP开发环境搭建与第一个程序

作为刚踏入编程世界的你,可能会觉得写程序是一件很神秘的事情。其实,程序就是一系列给计算机的指令,而PHP就是一种可以直接和Web服务器"对话"的语言。这篇文章会手把手教你搭建PHP开发环境,并写出你人生中的第一个PHP程序。

一、什么是PHP?

PHP(超文本预处理器)是一种专门用于Web开发的脚本语言。你可以把它理解为一个"翻译官"——当用户在浏览器中访问一个网页时,PHP负责处理用户的请求,然后把结果返回给浏览器显示。Facebook、Wikipedia、WordPress这些知名的网站都是用PHP编写的。

二、搭建PHP开发环境

对于新手来说,推荐使用集成开发环境(IDE)来学习PHP。我推荐使用VS Code配合PHP插件,或者使用XAMPP、MAMP这样的集成包。

Windows用户:下载XAMPP(https://www.apachefriends.org),安装后启动Apache服务即可。[1]

Mac用户:下载MAMP(https://www.mamp.info),安装后启动服务即可。[2]

Linux用户:可以使用apt-get install php安装PHP。

安装完成后,在命令行输入:

php -v

如果看到类似PHP 8.2.0的版本信息,说明安装成功了。

三、你的第一个PHP程序

新建一个文件,命名为hello.php,输入以下代码:

<?php// 这是我的第一个PHP程序// 注释:以 // 开头的内容计算机会忽略,这是给人类看的说明echo"Hello, World!";  // echo 是输出命令,把后面的内容显示出来?>

把文件放到Web服务器的文档目录下(XAMPP通常是htdocs文件夹),然后在浏览器访问:http://localhost/hello.php

你会看到页面上显示了:Hello, World!

代码讲解:

  • <?php告诉计算机"接下来的内容是PHP代码",这是PHP代码的开始标签
  • // 这是我的第一个PHP程序是单行注释,计算机会跳过这部分
  • echo是PHP的核心命令之一,意思是"输出",会把引号里的内容发送到浏览器
  • "Hello, World!"是一个字符串,字符串必须用引号包裹
  • ;表示语句结束,PHP每条语句都要以分号结尾
  • ?>是PHP代码的结束标签

四、让程序更有意思一点

<?php$name = "小明";      // 变量:用 $ 开头,name是变量名,"小明"是变量的值$age = 18;           // 这是整数类型,不需要引号echo"欢迎来到PHP的世界!\n";  // \n 表示换行echo"我叫" . $name . ",今年" . $age . "岁";  // . 是连接符,用来拼接字符串?>

代码讲解:

  • $name是一个变量,变量就像一个盒子,$name是这个盒子的标签,里面装着"小明"这个值
  • PHP中变量以$符号开头,这是PHP的独特语法
  • $age = 18中的18是数字,不需要引号,这是整数类型
  • .是字符串连接符,"我叫" . $name可以把几个字符串拼接起来
  • \n是转义字符,表示换行,在浏览器查看源代码时能看到效果

五、写在最后

恭喜你完成了第一个PHP程序!虽然看起来很简单,但这些都是编程的基础。接下来的文章会逐步深入,一起来探索PHP的魅力吧。

编程没有捷径,多敲代码、多思考才是最好的学习方法。下一篇文章我们会学习PHP的变量和数据类型。

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  1. CONNECT:[ UseTime:0.000617s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000630s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000318s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000298s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000479s ]
  6. SELECT * FROM `set` [ RunTime:0.000205s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000620s ]
  8. SELECT * FROM `article` WHERE `id` = 484106 LIMIT 1 [ RunTime:0.000474s ]
  9. UPDATE `article` SET `lasttime` = 1776630766 WHERE `id` = 484106 [ RunTime:0.006639s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000241s ]
  11. SELECT * FROM `article` WHERE `id` < 484106 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002273s ]
  12. SELECT * FROM `article` WHERE `id` > 484106 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000419s ]
  13. SELECT * FROM `article` WHERE `id` < 484106 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003711s ]
  14. SELECT * FROM `article` WHERE `id` < 484106 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002040s ]
  15. SELECT * FROM `article` WHERE `id` < 484106 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000972s ]
0.121812s