I want my users to be able to send emails from their iPads, and those emails would be generated based on templates. There will be many such templates built in, and eventually users will be able to hire web developer-type person to make custom templates.

My thinking was that PHP is the most popular language for that sort of thing, so it would be nice if could support that. My second choice is handlebars. I'm not sure if JSX would do the job?

Any thoughts appreciated.

https://github.com/groue/GRMustache.swift

If your app is in swift or objective-c, look into template libraries for those languages. Simple Google search tells me there's a couple of options including one using handlebar's format.

  <?php 
  for ($x = 0; $x <= 10; $x++) {
    echo "The number is: $x   <br>";
  } 

Someone else already mentioned GRMustache [1], and that looks pretty good.

I'm not sure if there is an iOS version, but you could look for something like liquid [2]. I think liquid is usually a better choice for user-controlled templates, especially when you're rendering on a server. But if they're just compiling the templates on their own device, then handlebars (GRMustache) would be the right way to go.

[1] https://github.com/groue/GRMustache

[2] https://github.com/Shopify/liquid

You could use PHP but then you have a whole host of other stuff that you don't want or need in a templating language.

same syntax