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php数据类型与检测
庄周梦蝶
Original
577 people have browsed it

PHP程序运行原理

浏览器接受到网站文件->传给Apache服务器，Apache服务器查看是什么文件，是HTML就解析返回给浏览器，是PHP就传给PHP模块->PHP解析完后穿给Apache服务器，Apache服务器再传到浏览器

php与html混编的方式与短标签的使用

只有文件里面有PHP代码，文件的后缀名就必须是PHP

  1. <html>
  2.     <head>
  3.     <?php
  4.         echo '<h2 style="color:red">您好，老师</h2>';
  5.     ?>
  6.         <? echo '<h2>您好，老师</h2>'?>
  7.         <?= '<h2>您好，老师</h2>'?>
  8.         <?php $st='<h2>您好，老师</h2>'?>
  9.         <?=$st?>
  10.     </head>
  11.     <body>
  12.     </body>
  13. </html>

常用数据类型

  1. 基本类型
    1-1.布尔类型
  1. <html>
  2.     <heab>
  3.         <?php
  4.             $passed=true;
  5.             echo $passed,'<hr>';
  6.             echo gettype($passed),'<hr>';
  7.             var_export($passed);
  8.             echo '<hr>';
  9.             var_dump($passed);
  10.         ?>
  11.     </heab>
  12.     <body>
  13.     </body>
  14. </html>


1-2.数值类型:整数，小数

  1. <html>
  2.     <heab>
  3.         <?php
  4.             $srt=4899;
  5.             $srr=4.48;
  6.             var_dump($srt,$srr);
  7.         ?>
  8.     </heab>
  9.     <body>
  10.     </body>
  11. </html>


1-3.字符串

  1. <html>
  2.     <heab>
  3.         <?php
  4.             $name='admin';
  5.             $email='admin@qq.com';
  6.             echo 'name:',$name,'<br>email:',$email;
  7.             echo'<hr>';
  8.             echo'hello "今天"<br>';
  9.             echo'heool \'明天\'<br>';
  10.             echo'c:\www\\tavv\i.html';
  11.         ?>
  12.     </heab>
  13.     <body>
  14.     </body>
  15. </html>


2.复合类型
2-1.数组

  1. <html>
  2.     <heab>
  3.         <?php
  4.             $srt=[1,'牛牛','js',80];
  5.             echo 'id=',$srt[0],'<br>';
  6.             echo 'name:',$srt[1],'<br>';
  7.             echo'kemu',$srt[2],'<br>';
  8.             echo'cj',$srt[3],'<br>';
  9.             //动态添加
  10.             $srt[4]=true;
  11.             echo'passd',$srt[4],'<br>';
  12.             //追加添加
  13.             $srt[]=24;
  14.             echo'sj',$srt[5],'<br>';
  15.             //使用追加创建数组
  16.             $sss=[];
  17.             $sss[]='蓝蓝的天空';
  18.             $sss[]='飞老鹰';
  19.             echo $sss[0],$sss[1],'<br>';
  21.             $ser=['id'=>1,'name'=>'牛牛','kemu'=>'js','cj'=>80];
  22.             echo 'id=',$ser['id'],'<br>';
  23.             echo 'name=',$ser['name'],'<br>';
  24.             echo 'kemu=',$ser['kemu'],'<br>';
  25.             echo 'cj=',$ser['cj'],'<br>';
  26.             //通过print_r(),显示关联数组
  27.             print_r($ser);
  28.             echo '<br>';
  29.             echo print_r($ser,true);
  30.             echo '<hr>';
  31.             echo '<pre>'.print_r($ser,true).'</pre>';
  32.         ?>
  33.     </heab>
  34.     <body>
  35.     </body>
  36. </html>


2.2对象

  1. <html>
  2.     <heab>
  3.         <?php
  4.             $a=1;
  5.             $b=2;
  6.             function sum($a,$b){
  7.             return $a.'+'.$b.'='.($a+$b);
  8.             }
  9.             echo sum($a,$b),'<br>';
  10.             //对象模版/类
  11.             class Demo{
  12.             private $a=1;
  13.             private $b=2;
  14.             public function sum(){
  15.             return $this->a.'+'.$this->b.'='.($this->a+$this->b);
  16.             }
  17.             }
  18.             $obj=new Demo();
  19.             echo $obj->sum(),'<br>';
  20.         ?>
  21.     </heab>
  22.     <body></body>
  23. </html>

Correcting teacher：天蓬老师天蓬老师

Correction status：qualified

Teacher's comments：
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