[PHP-DEV] Is it a good idea to have a "strict" mode?

[César Rodas]

Hi!

I'm wondering if it would be a good idea to have a `strict` mode in PHP.
Many language have them and it is a good idea.

I think it should be a bit different in PHP, it should encourage the
following things:

 - Avoid deprecated things, it should throw an exception.
 - Avoid explicit conversions of undefined constants to strings.
 - Anything else that could make run-time slower *or* bad practice.

```php
"use strict";

var_dump(FOOBAR); // should throw an exception, undefined constant.
```

Good idea?

Cheers,
-- 
César D. Rodas
Open Source developer
+595-983-161124
PGP: F9ED A265 A3AB C8A1 D145 7368 158A 0336 C707 0AA6

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