Description:
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From manual page: http://www.php.net/function.abs
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Currently return type is described as: 

"The absolute value of number. If the argument number is of type float, the return type is also float, otherwise it is integer (as float usually has a bigger value range than integer)."

and should be something like:

"The absolute value of number. If the argument number is of type float, the return type is also float, otherwise it is integer (as float usually has a bigger value range than integer). If the argument is of type integer with value of - PHP_INT_MAX - 1 (minimum signed integer value) the return type is float due to integer overflow...."

It's an edge case, but can be source of confusion if type is important.

Test script:
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$n = - PHP_INT_MAX - 1;

var_dump($n); // type - int

var_dump(abs($n)); // type - float