Mixins can be as double-edged as operator overloading. Doesn't mean I don't love me some operator overloading in C# when the mood strikes, but neither are features that in anyway approach KISS principles nor are they essential.
As for everything else, PHP can hang. I actually particularly like their implementation of closures. I know people fretted about NS but that is all much ado about nothing. Millions of keystrokes wasted complaining about which single keystroke is used as a NS delimiter.
If you must do some PHP and you've come from Python, Ruby, Scala, etc, do check out the Flow3 framework. You'll feel closest to home.
As for everything else, PHP can hang. I actually particularly like their implementation of closures. I know people fretted about NS but that is all much ado about nothing. Millions of keystrokes wasted complaining about which single keystroke is used as a NS delimiter.
If you must do some PHP and you've come from Python, Ruby, Scala, etc, do check out the Flow3 framework. You'll feel closest to home.