Equal comparison not working in php

Asked Jul 11 '18 at 21:08

Active Jul 11 '18 at 21:08

Viewed 19 times

For some reason, the == function does not appear to be working for me.

$total = 0;
for($i=0; $i< 5; $i++){
  $total += 10.1;
  print $total . "<br>";
  if($total == 20.2){
    print "SUCCESS<br>";
  }
  if($total == 30.3){
    print "SUCCESS";
  }
  if($total == 40.4){
    print "SUCCESS<br>";
  }
}

This prints out:
10.1
20.2
SUCCESS
30.3
40.4
SUCCESS
50.5

So for some reason it work recognize 30.3 as being equal to 30.3?! Why would this happen? I've tried this with a bunch of other numbers and I cannot figure out why this won't work?

asked Jul 11 '18 at 21:08

Andrew Sparrow

try to var_dump($total). It's probably a tiny difference in the float values – Don't Panic Jul 11 '18 at 21:10
See https://stackoverflow.com/questions/3148937/compare-floats-in-php for more explanation – Don't Panic Jul 11 '18 at 21:11
How is this a thing!!!!?? Why can't php handle basic multiplication and division? – Andrew Sparrow Jul 11 '18 at 21:30
Did you notice that the duplicate link is language-agnostic? This isn't just a PHP thing. – Don't Panic Jul 11 '18 at 21:31

Equal comparison not working in php

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