--- My code ---
<?
$HRDelta = 1;

function HRValue($Max = 100){
	global $HRDelta;
	$C = ($Max < 0 ? -1 : 1);
	
	$Order = floor(log10($Max * $C));
	$i = 1;
	do{
		$AxisMax = $i * $HRDelta * pow(10,$Order);
		$i++;
	}while($Max * $C >= $AxisMax);
	
	echo "Expression: (\$Max * \$C >= \$AxisMax) ? \"true\" : \"false\")<BR>\n";
	echo "Evaluated: (" . $Max * $C . " >= $AxisMax) ? \"true\" : \"false\")<BR>\n";
	echo "Answer: " . (($Max * $C >= $AxisMax) ? "true" : "false") . "<BR>";
	return $C * $AxisMax;
}

echo HRValue(-0.7);
?>

--- My Output ---
Expression: ($Max * $C >= $AxisMax) ? "true" : "false")
Evaluated: (0.7 >= 0.7) ? "true" : "false")
Answer: false
-0.7
--- Description problem ---
The last comparison operator returns false for some unknown reason. I also checked the variables using var_dump and they seem to be exactly the same (float(0.7)) according to php.

--- My configure line --
'./configure' '--with-apxs=/usr/sbin/apxs' '--with-mysql=/usr/' '--with-png-dir=/usr/local/libpng' '--with-gd=/usr/local/gd-1.8.4' '--with-zlib' '--with-ttf' '--with-freetype-dir=/usr/local/freetype2' '--with-xml' '--with-oracle=/users/home/oskarsson/OraHome1' '--with-oci8=/users/home/oskarsson/OraHome1'