ID: 41886 Updated by: [EMAIL PROTECTED] Reported By: c00lways at gmail dot com -Status: Open +Status: Bogus Bug Type: Math related Operating System: windows xp prof sp 2 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: ------------------------------------------------------------------------ [2007-07-03 11:42:22] c00lways at gmail dot com Description: ------------ int added by float ended as not equal to float equavalent value Reproduce code: --------------- //this output <empty>, not 1 echo isValidRange( 5.23, 1, 10, 0.01 ); //this output 1 //echo 5.23 == (1+4.23); function isValidRange( $p_value, $p_start, $p_end, $p_step=1 ) { //reverse step if( $p_end < $p_start ) { $p_step = -($p_step); } if( $p_step == 0.000000 ) { raiseError(1, "Invalid step: " . $p_step); } for( $c = $p_start; $c <= $p_end; $c+=$p_step ) { //this part caused the problem if( $p_value == $c ) { return true; } //if change it to //if( $p_value."" == $c."" ) // then it works! return true } return false; } Expected result: ---------------- 1 Actual result: -------------- <empty> ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=41886&edit=1
