Description:
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Currently the manual helpfully states on http://php.net/manual/en/function.assert.php that " The advantages of a string assertion are less overhead when assertion checking is off"

Which makes perfect sense. The disadvantages, of course, are that readability is reduced and IDE hints/highlighting won't work and the parser won't immediately catch parse errors in the string.

As a happy medium I propose it would be better if assert() could take a closure as it's first argument:

assert(function() {
	return 2 < 1;
});

This has the best of both worlds as the code wouldn't be executed unless assertions are turned on.