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PHP入门指南:从"啥是变量"到"我能行"的快乐旅程

  • 2026-02-28 01:14:52
PHP入门指南:从"啥是变量"到"我能行"的快乐旅程

大家好呀!我是富贵!今天咱们来聊聊PHP这门"世界上最好的语言"(别打脸,PHP程序员都这么说的😂)。

如果你是个编程小白,看到满屏幕的$符号就头晕,别怕!跟着我一起,10分钟让你从"这啥玩意"变成"哦~原来如此"!

📢 第一课:输出,让电脑听你说话

在PHP里,想让电脑显示点东西,有三个"小喇叭"可以用:

"你好呀~"// 最常用的,简单粗暴print_r($数组); // 专门看数组长啥样var_dump($东西); // 最贴心的,连类型都告诉你

打个比方:

echo就像你跟朋友说"吃饭去"

print_r像你介绍朋友:"这是我朋友小明"

var_dump像查户口:"这是小明,男性,25岁,程序员"

💬 第二课:引号三兄弟,各有各的脾气

PHP里的引号就像三个性格不同的兄弟:

双引号大哥:最随和,能看懂变量

$name="张三";echo"你好呀,$name";// 显示:你好呀,张三
单引号二哥:最实在,你说啥就是啥
echo'你好呀,$name';// 显示:你好呀,$name(真的把$name当文字了)
反引号小弟:最神秘,能执行系统命令
`ls -la`// 在Linux系统上显示文件列表

💰 第三课:变量,记得带美元符号

在PHP里,所有变量都得带$,就像出国旅游得带美元一样重要:

$age=18// 数字$name="小明"// 字符串  $isStudent=true// 布尔值(真/假)// 数组有两种:$colors=["红","黄","蓝"]; // 索引数组,像排队$student=["name"=>"小明","age"=>18]; // 关联数组,像填表
记住:每行代码结束要加分号;,不然PHP会生气给你看错误提示!

🔄 第四课:循环,让重复工作变简单

写代码最爽的就是让电脑帮我们做重复的事:

while循环:就像"只要还有饭吃,我就继续吃"

while(还有饭){        继续吃();}

for循环:就像"数到10就停"

for($i=1;$i<=10;$i++){  echo"第{$i}遍:我爱PHP❤️";}

foreach循环:处理数组的神器,就像点名册一个一个念

foreach($全班同学 as $同学){  echo $同学 ."来上课啦~";}

🧰 第五课:函数,程序员的偷懒神器

内置函数(PHP自带工具箱)

处理字符串的:

strlen("PHP"// 结果是3,数一数有几个字母explode(",","苹果,香蕉,橘子"// 把字符串切成数组str_replace("坏","好","这个苹果坏了"// 变成"这个苹果好了"

处理数组的:

array_push($水果篮,"葡萄"// 往篮子里加水果array_pop($水果篮// 从篮子里拿出最后一个水果unset($水果篮[1]) // 扔掉第二个水果

自定义函数(自己造工具)

function 计算年龄($出生年份){return2024- $出生年份;}echo"你今年". 计算年龄(2000)."岁啦!";

📁 第六课:文件操作,让数据"活"起来

包含文件:就像拼乐高,把不同零件组合起来

include"头部.php"// 引入文件require"必须的文件.php"// 这个文件必须有,不然就报错include_once"只引入一次.php"// 防止重复引入

读写文件

$内容 =file_get_contents("日记.txt"); // 读取日记file_put_contents("日记.txt","今天学了PHP,开心!"); // 写日记

🌐 第七课:JSON,程序员的"普通话"

JSON就是一种所有编程语言都能听懂的数据格式:

// PHP数组转JSON$小明 =["name"=>"小明","age"=>18];echojson_encode($小明);// 输出:{"name":"小明","age":18}// JSON转PHP数组$json数据 ='{"name":"小红","age":17}';$小红 =json_decode($json数据,true);

就像你在国外说英语,JSON就是编程界的"英语"!

🔒 第八课:MD5,密码的"隐身衣"

MD5加密就像给密码穿上了隐形斗篷:

$密码 ="123456";$加密后 =md5($密码);// 结果:e10adc3949ba59abbe56e057f20f883e

特点:

单向:只能加密,不能解密

唯一:同样的内容加密结果一样

不可逆:看到加密结果也猜不出原密码

就像把鸡蛋做成炒蛋容易,想把炒蛋变回鸡蛋?门都没有!

🎉 总结一下

学PHP就像学做饭:

echo是端菜上桌

变量是准备食材

循环是重复炒菜动作

函数是收藏菜谱

文件操作是把菜放冰箱

JSON是国际通用菜单

MD5是把菜谱加密保存

💡新手小贴士

代码写错了不要慌,看错误提示,它其实在帮你

多写多练,光看不练等于白看

遇到问题就百度,你不是一个人!

最后送大家一句话:PHP不难,难的是你不开始。今天就开始你的第一行PHP代码吧!

<?phpecho"Hello World! 我来啦!";?>
喜欢的话点个❤️,收藏不迷路,我们下期见!

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  1. CONNECT:[ UseTime:0.000632s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000834s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000281s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000297s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000542s ]
  6. SELECT * FROM `set` [ RunTime:0.000228s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000621s ]
  8. SELECT * FROM `article` WHERE `id` = 477267 LIMIT 1 [ RunTime:0.000431s ]
  9. UPDATE `article` SET `lasttime` = 1772278887 WHERE `id` = 477267 [ RunTime:0.000735s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000339s ]
  11. SELECT * FROM `article` WHERE `id` < 477267 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000437s ]
  12. SELECT * FROM `article` WHERE `id` > 477267 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000393s ]
  13. SELECT * FROM `article` WHERE `id` < 477267 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000815s ]
  14. SELECT * FROM `article` WHERE `id` < 477267 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000728s ]
  15. SELECT * FROM `article` WHERE `id` < 477267 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002261s ]
0.133528s