Download versi php yang di inginkan dari sini, kemudian extract ke folder sesuaikan dengan versi yang di inginkan misal : download php-5.6.13-nts-Win32-VC12-x64.zip extract ke folder php5_6, pindahkan ke folder c:\xampp\ kemudian.tambahkan pada xampp control panel pada tombol config

tambahkan pada baris paling bawah sendiri

ScriptAlias /php5_6/ "C:/xampp/php5_6/"
<Directory "C:/xampp/php5_6">
    AllowOverride None
    Options None
    Require all denied
    <Files "php-cgi.exe">
          Require all granted
    </Files>
</Directory>
 
Listen 8056
<VirtualHost *:8056>
    UnsetEnv PHPRC
    <FilesMatch "\.php$">
        php_flag engine off
        SetHandler application/x-httpd-php5_6
        Action application/x-httpd-php5_6 "/php5_6/php-cgi.exe"
    </FilesMatch>
</VirtualHost>
 
 
ScriptAlias /php7_1/ "C:/xampp/php7_1/"
<Directory "C:/xampp/php7_1">
    AllowOverride None
    Options None
    Require all denied
    <Files "php-cgi.exe">
          Require all granted
    </Files>
</Directory>
 
Listen 8071
<VirtualHost *:8071>
    UnsetEnv PHPRC
    <FilesMatch "\.php$">
        php_flag engine off
        SetHandler application/x-httpd-php7_1
        Action application/x-httpd-php7_1 "/php7_1/php-cgi.exe"
    </FilesMatch>
</VirtualHost>

coba buka browser localhost:8071/dashboard/phpinfo.php