Knowledge Base

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

Symptoms

An error like this one appears in Domains > example.com > Logs, or on the website

Note: <function_name> is a placeholder and will be different in the actual error

Got error 'PHP message: PHP Fatal error: Uncaught Error: Call to undefined function <function_name>() 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

The PHP function from the error is disabled in php.ini

Resolution

Warning: These steps don't work with PHP-FPM (global settings override them); they only apply to FastCGI.

Enable the disabled functions in the PHP configuration.

Individual Domain

All Domains (Plesk Panel)

All Domains (CLI)

Log in to Plesk
Go to Domains > example.com > PHP Settings
Remove the desired function from disable_functions
Press OK

If there's no section called disable_functions, add disable_functions="" to Additional directives instead.

Log in to Plesk
Identify the affected PHP handler in Domains > example.com > PHP
Go to Tools & Settings > PHP Settings > Affected PHP version > php.ini
Find disable_functions and remove the function from the error
Press OK to save the changes

Connect to the server over SSH
Identify the affected PHP handler with this command

Note: Replace example.com with the website from the error

# plesk db "SELECT d.name,h.php_handler_id FROM domains d JOIN hosting h on h.dom_id=d.id WHERE name='example.com'"
Edit the handler's php.ini

Note: Replace X.X with the version from Step 2

# vi /opt/plesk/php/X.X/etc/php.ini
Find the line with disable_functions and delete the function from the error
Restart the PHP service:

# service plesk-phpXX-fpm restart