PHP decimal Calculation mode It's too much for dad.

How do you calculate PHP decimals?
if (0.030! = (0.530-0.500+0+0))
{
$s = 0.530-0.500+0+0;
$s = 0.03-$s;
}


This is not equal??
It's not 0 after subtracting.

Is this PHP an alien calculation method?

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------Solution--------------------
References:

Quote: References:

Would you please cram your knowledge about floating-point numbers?

$f = (0.530-0.500+0+0) *1000;
$a = (0.030*1000);

$ssa = Doubleval ($a)-doubleval ($f);

It's wrong to write ... How did he figure that out?

This is not only PHP, Java also has a phenomenon
So PHP has 2 ways to solve floating-point numbers.
One is
if (0.030! = (0.530-0.500+0+0))
{
$s = 0.53-0.5;
$s = 0.03-"$s";
Echo $s;
}
Put the variable in double quotes and it's OK.
Another way is to use the round function.

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