Executing this code:

print((      floor(7)  ==       floor(7.1) ) . "<BR>");
print((pow(2,floor(7)) == pow(2,floor(7.1))) . "<BR>");

outputs

1<BR><BR>

So, if floor(7) is equal to floor(7.1) how can pow(2,x) from both numbers be different?

PHP 4.0.3pl1 gives the correct output 1<BR>1<BR>

Using the === to compare both non of the expressions is true, so i think floor and pow return int if the input is a integer, but the documentation says they always returns float. If i use 7.0 instead if 7 the output is correct and both expressions are equal.