I'm getting unexpected values for variable calculations: <pre class="prettyprint"><code>$var1 = $var2 * (((1 + $var3)^$var4)^$var5); </code></pre> I've verified that <code>$var2</code> is 3, <code>$var3</code> is 0.1, <code>$var4</code> is 1, <code>$var5</code> is 1.1 so, <code>$var1 = 3*(((1+0.1)^1)^1.1) = 3.3316</code> but in PHP, <code>$var1 = 3</code> if I change <code>$var4</code> to 2, <code>$var1 = 3*(((1+0.1)^1)^1.1) = 3.6999</code> but in PHP, <code>$var1 = 6</code> Why is this? Any ideas? I've tried explicitly declaring all variables as floats.

Note that <code>^</code> is not "power of". You may want to have a look at the pow function. (<code>^</code> is actually "bitwise exclusive or".)

PHP bizarre math

I'm getting unexpected values for variable calculations:

$var1 = $var2 * (((1 + $var3)^$var4)^$var5);

I've verified that $var2 is 3, $var3 is 0.1, $var4 is 1, $var5 is 1.1 so,

$var1 = 3*(((1+0.1)^1)^1.1) = 3.3316 but in PHP, $var1 = 3

if I change $var4 to 2,

$var1 = 3*(((1+0.1)^1)^1.1) = 3.6999 but in PHP, $var1 = 6

Why is this? Any ideas? I've tried explicitly declaring all variables as floats.

Note that ^ is not "power of". You may want to have a look at the pow function.

(^ is actually "bitwise exclusive or".)