variables float no equals in php why?

Question

hello I have a problem wtich two variables in php. i have this code:

     var_dump($total);echo '<br/>';
     var_dump($reserva->getAdelanto());
     if ($total == $reserva->getAdelanto()){
        $total = 0;
        echo "hello";
        }
    else
        $total = $total - $reserva->getAdelanto();

print :

float(3940.2) 
float(3940.2)

but does not enter the if when the two variables are equal. anyone knows why is that? greetings and thanks.

I've faced this problem in C++ too. To solve this what I do is to check their difference. for an example if(abs($x-$y)<$eps)echo "They are equal"; where $eps = 0.000000001 or the tolerance value — Fallen, Jun 25 '13 at 12:00

score 1 · Answer 1 · answered Jun 25 '13 at 12:00

1

May be try with abs like

if ((abs($a)-abs($b)) <= 0.00001) {
   echo "same";
}

Or

if (abs($a - $b) <= 0.00001) {
   echo "same";
}

Or you also try like

var_dump( bccomp($a, $b) == 0 )

returns true if they are same

answered Jun 25 '13 at 12:00

GautamD31

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2

it should be abs($a-$b) – Fallen Jun 25 '13 at 12:01
1

for $a = 10, $b = 5, your code will say that these 2 are same :P – Fallen Jun 25 '13 at 12:02
@MuhammedHedayet I have added that also...could you see once,and also my third ans – GautamD31 Jun 25 '13 at 12:05
well my second comment is for the first code. for $a = 10, $b = 5, abs($a)-abs($b)=-5 which is less than 0.00001 but these two are not same. We need the absolute value of the difference, not the difference of absolute values :) – Fallen Jun 25 '13 at 12:06

variables float no equals in php why?

1 Answers1