LoadModule php5_module "/usr/local/php5/php5apache2_2.so"

<Directory "/usr/local/php4">
    AllowOverride None
    Options ExecCGI
    Order Allow,Deny
    Allow from All
</Directory>

    <Files "*.php">
       AddHandler application/x-httpd-php .php
    </Files>

    ScriptAlias /php4/ "/usr/local/php4/"
    Action php4-script "/php4/php.exe"
    AddHandler php4-script .php4

<Directory /var/www/htdocs/myoldphp>
  RemoveHandler .php
    <Files "*.php">
       AddHandler php4-script .php
    </Files>
</Directory>