#41714 [Opn->Bgs]: Problem with intval()

ID: 41714 Updated by: johannes@php.net Reported By: bartlomiejbak at gmail dot com -Status: Open +Status: Bogus Bug Type: *Math Functions Operating System: ubuntu PHP Version: 5.2.3 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://docs.sun.com/source/806-3568/ncg_goldberg.html Thank you for your interest in PHP. . Previous Comments: ------------------------------------------------------------------------ [2007-06-16 21:18:01] bartlomiejbak at gmail dot com Description: ------------ Hi. I've got a little bit problem this code should show me result of equation 20x + 27y = 1 for ($y = 0; $y < 1000; $y++) { $x = (1/20) - (27/20) * $y; if ($x == intval($x)) $out .= "x: $x,y: $y\n"; } I need only int values of X and Y but intval() sometimes return wrong value. Result should be (-4,3),(-31,23),(-58,43) etc. but php is starting showing from (-31,23)... ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=41714&edit=1