For loop not breaking after conditional statement is met

Question

I'm trying to increment decimal places on php but it doesn't break inside the if statement

for($x = 0; $x <= 1; $x += 0.001){
    //0.01 = 0.010
    if($x===0.01){
        break;  
    }
    echo $x.'<br>';
}

Does this answer your question? [Is floating point math broken?](https://stackoverflow.com/questions/588004/is-floating-point-math-broken) — corashina, Oct 01 '20 at 08:57

score 1 · Accepted Answer · answered Oct 01 '20 at 03:44

Floating point arithmetic is not exact in PHP (or really any language). Read Is floating point math broken for a general explanation of why this is the case. As a result, the loop counter might not ever have the exact value 0.01. Instead, you could break when the dummy variable has exceeded a threshold of 0.01:

for ($x=0; $x <= 1; $x += 0.001) {
    // 0.01 = 0.010
    if ($x >= 0.01) {
        break;
    }

    echo $x . '<br>';
}

When tested locally, the above script is printing:

0<br>0.001<br>0.002<br>0.003<br>0.004<br>0.005<br>0.006<br>0.007<br>0.008<br>0.009<br>

For loop not breaking after conditional statement is met

1 Answers1