Executing php exec system shell_exec has no results? Done in one article!-PHP Tutorial-php.cn

Executing php exec system shell_exec has no results? Done in one article!

藏色散人

Release： 2023-04-11 08:48:02

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This article will introduce to you the problem that php exec system shell_exec cannot be executed. The main content is to explain the method of executing php exec() system() shell_exec() without results and the result is NULLD. I hope it will be helpful to friends in need~

Executing php exec system shell_exec has no results? Done in one article!

php exec() system() shell_exec() cannot be executed, there is no result, the result is NULLD, solution

The code index.php on the server:

<?php    
$cmd = &#39;php -v&#39;;    
exec($cmd, $arr);    
echo &#39;<pre class="brush:php;toolbar:false">'    
var_dump($arr);

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After the browser is accessed, the printed result is: NULL

It means that the server has not turned on PHP and used exec(); [Recommended learning: PHP video Tutorial】

Solution:

1. Add a function to view the currently running user:

<?php    
var_dump(get_current_user());    
$cmd = &#39;php -v&#39;;    
exec($cmd, $arr);    
echo &#39;<pre class="brush:php;toolbar:false">'    
var_dump($arr);

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Display: root

2. Go to the server to modify file permissions:

$ chmod 777 index.php

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View the user and permissions of index.php:

$ ll

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Result:

-rwxrwxrwx 1 root root    1595 Sep 20 10:18 index.php

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3. Check php.ini to see if these functions are disabled:

$ cd /usr/local/php/etc
$ vim php.ini

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##Find disable_functions =

Remove exec, system, and exec_shell and use whichever one you use;

4. Restart the php service. This step is very important:

$ /etc/init.d/php-fpm restart

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Then test, the browser accesses the server and the result is:

Most of it is because php.ini disables the exec function and the execution permission of the file.

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