Install PHP 5.6 on Linux Mint 18 Sarah/Serena/Sonya/Sylvia GNU/Linux – Step by step Tutorial.
And to get the PHP 5.6 Linux Mint 18 Installation, you have to Manually Setup the Linux Mint Apt PPA Repository.
Finally, this PHP 5.6 PPA includes also All the most Useful Extensions for PHP usage.
 
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1. Launching TerminalOpen a Terminal window 
 (Press “Enter” to Execute Commands)  
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2. Enabling PPA RepoAdd PHP PPA for Linux Mint 
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3. Installing PHP 5.6Then to Install PHP 5.6 on Linux Mint. sudo apt install php5.6 
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4. Setting PHP Version(Optional, for managing multiple Versions) And to Set PHP 5.6 as Default. sudo update-alternatives --config php And then Choose the Right PHP release ID. 
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5. Searching PHP 5.6 ExtensionsAgain to Search PHP 5.6 Extensions. grep php- /var/lib/apt/lists/ppa.launchpad.net_ondrej_php*Packages 
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6. Installing LAMP PHP 5.6 on MintHow to Install LAMP with PHP 5.6 on Linux Mint 18 
So Now I’m truly Happy if My Guide could Help you to Install PHP 5.6 on Linux Mint 18!
