Description:
------------
position inaccurate when adding 0.001 to a value

possible solution round($num, 3);

Test script:
---------------
   	echo '<table>';
    	$ii =0;
    	for($i =1; $i<= 10000; $i++)
    		   	{
     		   		echo '<tr>';
    		   		echo '<td>';
    		   		echo $ii;
    		   		echo '</td>';
    		   		echo '</tr>';
    		   		$ii = $ii +0.001;
    		   	}
    	   	echo '</table>';

Expected result:
----------------
1.459		
1.46		
1.461		
1.462
1.463	
1.464
1.465
1.466
...
2.369	
2.370
2.371
2.372
2.373
2.374
2.375

...
3.278	
3.279
3.280
3.281

Actual result:
--------------
1.459		
1.46		
1.4609999999999		
1.4619999999999		
1.4629999999999		
1.4639999999999		
1.4649999999999		
1.4659999999999		
...
2.3689999999999		
2.3699999999999		
2.3709999999998		
2.3719999999998		
2.3729999999998		
2.3739999999998		
2.3749999999998	
...
3.2769999999998		
3.2779999999998		
3.2789999999997		
3.2799999999997		
	
and so on