php and apache thread safe error

Disabling mpm_event and enabling mpm_prefork worked for me.

sudo a2dismod mpm_event
sudo a2enmod mpm_prefork

Test the Apache configuration:

apache2ctl configtest

Install PHP and PHP-FPM:

sudo apt-get install php7.0
sudo apt-get install php7.0-fpm

Enable Apache PHP7 module:

sudo a2enmod php7.0

Disable mpm_event module:

sudo a2dismod mpm_event

Enable mpm_prefork module:

sudo a2enmod mpm_prefork

Finally restart Apache:

sudo service apache2 restart

This will resolve your error.

The PHP manual does not recommend this

You can run a fast-CGI version of PHP though:

apt-get install php5-fpm should install it for you.

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