There is nothing wrong with PHP, any developer that is not too lazy can have any number of PHP version on the same host without any problems, a PHP "install" is

There is nothing wrong with PHP, any developer that is not too lazy can have any number of PHP version on the same host without any problems, a PHP "install" is basically unzipping in a separate folder and configuring the php.ini for specific needs. There may be something wrong with some IDE's where you cannot easily configure and switch between various PHP versions when you do any task that is version specific.