Bug #64534 [Opn->Nab]: Bad transfer variable from double to integer with specific number

Edit report at https://bugs.php.net/bug.php?id=64534&edit=1 ID: 64534 Updated by: johannes@php.net Reported by: izolex4 at gmail dot com Summary: Bad transfer variable from double to integer with specific number -Status: Open +Status: Not a bug Type: Bug Package: Scripting Engine problem Operating System: Linux PHP Version: 5.3Git-2013-03-27 (Git) Block user comment: N Private report: N New Comment: Floating point values have a limited precision. Hence a value might not have the same string representation after any processing. That also includes writing a floating point value in your script and directly printing it without any mathematical operations. If you would like to know more about "floats" and what IEEE 754 is, read this: http://www.floating-point-gui.de/ Thank you for your interest in PHP. . Previous Comments: ------------------------------------------------------------------------ [2013-03-27 15:16:12] izolex4 at gmail dot com Description: ------------ I have variable with type "double" with value 16.90 or 17.90 or 18.90 or 19.90. Now multiply variable x 100 and now set type of variable to "integer" with function "settype" and print this variable. Result will for example: 1989, even that correct result is 1990. This make only, when original value is 16.90 or 17.90 or 18.90 or 19.90. If is original value another (for example 10.90 or 19.80), result will be correct (for example 1090 or 1980), but now is result incorrect for example 1989. Test script: --------------- <?php $double = 19.90; // Only 16.90 or 17.90 or 18.90 or 19.90 will print bad result $integer = $double*100; // Now is value 1990 settype($integer, 'integer'); // This change value to 1989 - bug echo $integer; Expected result: ---------------- Value of "integer" - 1990 Actual result: -------------- Value of "integer" - 1989 ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=64534&edit=1