Description:
------------
1)
When executing 'php -c /path-to-ini-file /path/exec.php' via the system() function in the Apache module the script 'exec.php' doesn't have HOST value in $_SERVER.

Running in the OS command line 'php -c /path-to-ini-file /path/exec.php' $_SERVER has HOST value.

I consider it inconsistent for the HOST value which is in both cases known.

2)
$_SERVER is more or less exactly the section Environment from phpinfo() function when running via system() in a browser tab.

This behavior is nowhere documented and fairly surprising.

Test script:
---------------
foo.php - calling in a browser tab:

<?php
system("php -c  /etc/php7/cli/php.ini /path/exec.php");
?>

exec.php - called a) via system() or directly from command line:

<?php
print_r($_SERVER);
?>


Expected result:
----------------
From command line AND via system() in Browser tab:
Array
(
    ...
    [HOST] => MY_HOST   <---- MISSING
    [_] => /usr/bin/php
    [PHP_SELF] => /path/exec.php
    [SCRIPT_NAME] => /path/exec.php
    [SCRIPT_FILENAME] => /path/exec.php
    [PATH_TRANSLATED] => /path/exec.php
    [DOCUMENT_ROOT] =>
    [REQUEST_TIME_FLOAT] => 1538415804.9271
    [REQUEST_TIME] => 1538415804
    [argv] => Array
        (
            [0] => /path/exec.php
        )

    [argc] => 1
)



Actual result:
--------------
Totally different output; even running exec.php as PHP CLI version. No HOST entry.

This is the output from system() in a browser tab:


Array
(
    [APACHE_CONF_INCLUDE_FILES] => 
    [mpm_found] => true
    [APACHE_CONF_INCLUDE_DIRS] => 
    [SYSCONFIG_FILE] => /etc/sysconfig/apache2
    [APACHE_START_TIMEOUT] => 2
    [HTTPD_MODULE_IDS] =>  actions_module alias_module ...
    [APACHE_SERVERNAME] => 
    [PATH] => /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
    [APACHE_HTTPD_CONF] => 
    [PWD] => /userdata/dev1/faewe.technology
    [APACHE_SERVERTOKENS] => ProductOnly
    [NOTIFY_SOCKET] => /run/systemd/notify
    [APACHE_SERVERADMIN] => 
    [HTTPD_MODULE_PATHS] =>  /usr/lib64/apache2-prefork/mod_actions.so ...
    [SHLVL] => 1
    [APACHE_ACCESS_LOG] => /var/log/apache2/access_log combined
    [LC_CTYPE] => en_US.UTF-8
    [APACHE_LOGLEVEL] => warn
    [APACHE_USE_CANONICAL_NAME] => off
    [APACHE_EXTENDED_STATUS] => off
    [APACHE_MODULES] => actions ... php7
    [APACHE_SERVER_FLAGS] => 
    [HTTPD_MPM] => prefork
    [APACHE_SERVERSIGNATURE] => off
    [sysconfig_loaded] => true
    [APACHE_MPM] => 
    [OLDPWD] => /
    [_] => /usr/bin/php
    [PHP_SELF] => /path/exec.php
    [SCRIPT_NAME] => /path/exec.php
    [SCRIPT_FILENAME] => /path/exec.php
    [PATH_TRANSLATED] => /path/exec.php
    [DOCUMENT_ROOT] => 
    [REQUEST_TIME_FLOAT] => 1538415816.209
    [REQUEST_TIME] => 1538415816
    [argv] => Array
        (
            [0] => /path/exec.php
        )

    [argc] => 1
)