When I publish my Google App Engine app to run in production, if I've made an error in my PHP and I get an error_log() about an undefined variable or something, that code gets spewed directly to the browser and it breaks my HTML, breaks my JavaScript, etc.
However, when I run the app on localhost, the warning error_log()s are showing in the browser, and they aren't showing my GAE logs either! If I explicitly code an error_log(), that will show up in the GAE logs, but the PHP warnings aren't showing up.
So, I think my code is working fine, but when I publish then everything breaks and I'm in hot water.
How can I make my local GAE spew those warnings to the browser so I can get the same behavior that I'm seeing in production?