Domain’s PHP functional is not available: xxx() has been disabled for security reasons

Dmitry Bystrov

10 months ago

Symptoms

Cannot send mail via PHP script or cannot execute curl request via PHP script;
The following error can be found in the domain's error log in Domains > example.com > Logs, alternatively, this error might be reflected instead of domain's content:

Got error 'PHP message: PHP Fatal error: Uncaught Error: Call to undefined function mail() in /var/www/vhosts/example.com/httpdocs/test.php:3nStack trace:n#0 {main}n thrown in /var/www/vhosts/example.com/httpdocs/test.php on line 3'

Cause

PHP function xxx() is disabled in php.ini.

Resolution

Warning: These steps ONLY apply to PHP-FastCGI, they do NOT apply for PHP-FPM, because for FPM disabled_functions directives will get overwritten by the Global PHP Configuration.

Configuring disable_functions in Plesk interface for a particular domain:

Log into Plesk;
Go to Domains > example.com > PHP Settings, remove everything from disable_function section > OK:

In case there is no disable_function section add the following line in Additional configuration directives field in Domains > example.com > PHP Settings > Additional directives to override main php.ini directives:

disable_functions=""

Note: For the server-wide ways, check what PHP handler is enabled in Plesk > Home > Domains > example.com > PHP Settings . Let it be PHP 8.1.

Configuring disable_functions in Plesk interface server-wide:

Log into Plesk;
Go to Tools & Settings > PHP Settings > <PHP handler version> > php.ini;
Find disable_functions and remove xxx from the list. Press OK to save changes.

Configuring disable_functions server-wide via SSH:

Connect to the server via SSH.
Check that disable_functions is enabled in the php.ini of the handler in use:

# grep xxx /opt/plesk/php/8.1/etc/php.ini | grep disable
disable_functions = xxx,mail,curl_multi_exec,dl,exec,passthru,proc_open,proc_close,shell_exec,show_source,symlink,system,show_source, popen
Open php.ini file with text editor, i.e. vi editor:

# vi /opt/plesk/php/8.1/etc/php.ini
Find the line with disable_functions and delete xxx function from the list of disabled functions.
Restart PHP service:

# service plesk-php81-fpm restart

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