php phpinfo What should I do if php information cannot appear?

php The solution to the problem that php information cannot appear in phpinfo: 1. Find and open the php.ini file; 2. Open the short_open_tags in it; 3. Reload the php.ini service.

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

php phpinfo What should I do if php information cannot appear? ? Why can't your phpinfo() display

##1. Problem description

I wrote a php file test.php, the code is as follows :

<?php
    echo phpinfo();
?>

The browser visited it, but returned NULL.

2. Problem location and solution

After checking online, the problem encountered by most people is actually short_open_tags problem. Their The code is as follows:

<?
    echo phpinfo();
?>

In this case, you need to open short_open_tags in php.ini, and then reload the php.ini service and it will be OK.

There are two more questions here. One is how to know which php.ini file is loaded when php is executed. You can execute it on the command line: php --ini to find the php.ini file; the other is how to find the php.ini file. Reload the php.ini file. If php-fpm is enabled on your server, generally speaking, restarting php-fpm will be OK. The command is: service php-fmp restart. If the php-fpm service is not enabled (earlier version php), generally restarting the apache service is OK, the command is service httpd restart.

After following the above steps, the problems encountered by most people will be solved, but this is other people’s problems, not mine orz...

Helpless , I felt that this thing must be related to the configuration of php, so I went to the official website to read the php.ini document. The following configuration is as follows:

　　disable_functions string 
   本指令允许你基于安全原因禁止某些函数。接受逗号分隔的函数名列表作为参数。 disable_functions 不受安全模式的影响。 本指令只能设置在 php.ini 中。例如不能将其设置在 httpd.conf

It means that some methods can be configured in php.ini, These methods cannot be called. Open php.ini to find this configuration. Sure enough, the phpinfo() method is disabled, as follows:

disable_functions = phpinfo,system,proc_open,proc_close,show_source,popen,pclose

It suddenly dawns on you here that you can temporarily delete the phpinfo() method from disable_functions. , reload the php.ini file, and then access test.php from the browser again. This time it was successful and the problem was solved. However, I would like to remind my friends that phpinfo() is very sensitive information. It is usually best not to expose it to the client, so I quickly turned it off after the test.

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