On Linux systems, you can install any PHP version you need and then make
it available in Plesk by registering it with the php_handler
command-line utility.
To add the support for an arbitrary PHP version in Plesk:
- 
Install the desired PHP version on your server. For installation
guidelines, refer to the official PHP documentation available at
http://php.net/manual/en/install.php. In brief, the installation
includes the following main steps.Note: These steps are provided for demonstration purposes only.
Depending on your operating system and the desired configuration,
installation steps can differ significantly. When you install an
additional PHP version on your server, read the official PHP
documentation on installation.- 
Log in to your server as
root. - 
Obtain the PHP source you need from the official website
(http://php.net/downloads.php) and unpack it:gunzip php-NN.tar.gz tar -xf php-NN.tar
 - 
Configure and build PHP. This is when you can customize PHP with
various options, such as specifying which extensions will be
enabled. Run./configure --helpfor a list of available
options.cd ../php-NN ./configure --prefix /usr/local/phpNN make make install
 - 
Set up your
php.ini:cp php.ini-development /usr/local/lib/php.iniYou may edit your
.inifile to set PHP options. If you prefer
havingphp.iniin another location, run theconfigure
utility with the option--with-config-file-path=/some/pathin
step 3. 
 - 
 - 
Register the new PHP version in Plesk using the
php_handler
utility. For details, refer to the CLI
Guide.