Since when does PHP autocast integer to float?

echo 1/3;

I was expecting the above to output 0, but in fact PHP is smart enough to output 0.33333333333333

Since开发者_JAVA百科 when does PHP start to behave like this?

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It has always behaved like this. See: http://php.net/manual/en/language.operators.arithmetic.php

The division operator ("/") returns a float value unless the two operands are integers (or strings that get converted to integers) and the numbers are evenly divisible, in which case an integer value will be returned.

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PHP isn't a strongly typed language. It does things like that all the time.

As far as I know, php was designed like this from the beginning.

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I'd say this is the expected behaviour.

If you want an integer, force a cast:

echo (int)(1/3);