PHP's killer app is the LAMP stack and $5 hosting. Unless you can replicate that familiarity on a phone, PHP wont find traction. There are far better programming languages out there with more backing, and I don't think not having PHP has been a major hurdle for mobile development
PHP is the core web language because PHP devs (for the most part) are cheap, replaceable parts. You need to be smarter than that for mobile development, and anyone smart enough for mobile dev won't use PHP if they don't have to.
PHP is the core web language because PHP devs (for the most part) are cheap, replaceable parts. You need to be smarter than that for mobile development, and anyone smart enough for mobile dev won't use PHP if they don't have to.