PHP is a server-side language as you might now, so you are not replacing anything of it with Angular for the frontend, that's just an addition.
Not really. Perhaps you've missed all the "front side templates" thing. You can for example remove all PHP templating code, and just send JSON to be converted to HTML client side.
Besides, your dichotomy is invalid in general too. You can do lots of backend stuff in the front end too, if you want. E.g if you have a PHP script that converts a POST text variable into Markdown, you can opt to do it in the client, with a Javascript Mardkown lib. You can do calculations, you can use the canvas to generate images you used to do with GD, etc.
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Not really. Perhaps you've missed all the "front side templates" thing. You can for example remove all PHP templating code, and just send JSON to be converted to HTML client side.
Besides, your dichotomy is invalid in general too. You can do lots of backend stuff in the front end too, if you want. E.g if you have a PHP script that converts a POST text variable into Markdown, you can opt to do it in the client, with a Javascript Mardkown lib. You can do calculations, you can use the canvas to generate images you used to do with GD, etc.