Edit report at http://bugs.php.net/bug.php?id=53949&edit=1
ID: 53949
Comment by: delphists at apollo dot lv
Reported by: pleszczynski at zubi dot pl
Summary: Rounding error
Status: Open
Type: Bug
Package: Unknown/Other Function
Operating System: Linux
PHP Version: 5.2.17
Block user comment: N
Private report: N
New Comment:
Getting invalid results for values between 1048576.505 and 1342176.505:
<?php
for ( $n = 1048574.505; $n <= 1342178.505; ++$n ) {
$rounded = (string)round($n, 2);
if ( preg_match('#.51$#', $rounded) ) {
echo "Got correct result with n = {$n}\n";
}
}
?>
Result:
Got correct result with n = 1048574.505
Got correct result with n = 1048575.505
Got correct result with n = 1342177.505
Got correct result with n = 1342178.505
Previous Comments:
------------------------------------------------------------------------
[2011-02-07 14:13:17] pleszczynski at zubi dot pl
Description:
------------
PHP 5.2.13 & 5.2.17 both have this weird errors in rounding function.
This happens quite often, I can supply other numbers as well.
Test script:
---------------
<?php
echo " 1.505: " . round(1.505, 2) . "\n";
echo " 11.505: " . round(11.505, 2) . "\n";
echo " 111.505: " . round(111.505, 2) . "\n";
echo " 111.505: " . round(1111.505, 2) . "\n";
echo " 1111.505: " . round(11111.505, 2) . "\n";
echo " 11111.505: " . round(111111.505, 2) . "\n";
echo " 111111.505: " . round(1111111.505, 2) . "\n";
echo " 1111111.505: " . round(11111111.505, 2) . "\n";
echo "11111111.505: " . round(111111111.505, 2) . "\n";
Expected result:
----------------
1.505: 1.51
11.505: 11.51
111.505: 111.51
111.505: 1111.51
1111.505: 11111.51
11111.505: 111111.51
111111.505: 1111111.51
1111111.505: 11111111.51
11111111.505: 111111111.51
Actual result:
--------------
1.505: 1.51
11.505: 11.51
111.505: 111.51
111.505: 1111.51
1111.505: 11111.51
11111.505: 111111.51
111111.505: 1111111.5
1111111.505: 11111111.51
11111111.505: 111111111.51
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/bug.php?id=53949&edit=1
