Bug #68703 [Fbk->Opn]: bug in action for big numbers

Edit report at https://bugs.php.net/bug.php?id=68703&edit=1 ID: 68703 User updated by: andkos11 at gmail dot com Reported by: andkos11 at gmail dot com Summary: bug in action for big numbers -Status: Feedback +Status: Open Type: Bug Package: BC math related Operating System: Windows PHP Version: 5.6.4 Block user comment: N Private report: N New Comment: Yes, because the result obtained is not always valid. Tested as in this example, and once receives the expected result, and once there so I decided to report this error. And I sent this example $_GET,because as observed at the beginning on it. I thought it might be really fault this, but after doing: echo bcpowmod ( "26876030130522977362132073521581183346181374574161923861784515294359096339790317651642545453710861830", "77317036686803103778936280840587979061852865432165222860201467725250008729818881455247433896121539492", "23419441391667485230412027806848395891480806969028551095494276441653557878516815994557378094191773302" ); the result was bad, and after being shown the correct refresh, refreshed so a couple of times a page, and again I received is not correct Previous Comments: ------------------------------------------------------------------------ [2015-01-09 17:53:00] ab@php.net @andkos11, this can be hardly called a reproducer as you depend on $_GET. When I rephrase your snippet according to the data you've posted in the description, i se the expected result. See echo bcpowmod( "26876030130522977362132073521581183346181374574161923861784515294359096339790317651642545453710861830", "77317036686803103778936280840587979061852865432165222860201467725250008729818881455247433896121539492", "23419441391667485230412027806848395891480806969028551095494276441653557878516815994557378094191773302" ); Please post a self enclosed reproducer or check your code. Thanks. ------------------------------------------------------------------------ [2015-01-01 17:32:14] andkos11 at gmail dot com Test script: <?php if(!empty($_GET['a']) && !empty($_GET['b']) && !empty($_GET['c'])) { echo bcpowmod($_GET['a'], $_GET['b'], $_GET['c']); } ?> ------------------------------------------------------------------------ [2014-12-31 22:01:41] ab@php.net Thank you for this bug report. To properly diagnose the problem, we need a short but complete example script to be able to reproduce this bug ourselves. A proper reproducing script starts with <?php and ends with ?>, is max. 10-20 lines long and does not require any external resources such as databases, etc. If the script requires a database to demonstrate the issue, please make sure it creates all necessary tables, stored procedures etc. Please avoid embedding huge scripts into the report. The script you supply isn't a self enclosed repro case. Thanks. ------------------------------------------------------------------------ [2014-12-31 01:10:42] andkos11 at gmail dot com Description: ------------ When tested bcpowmod, I saw that sometimes it returns wrong results, and only after this functions is twice replaced by the correct result, but this error does not occur every time so I could be a problem to observe it The number for this wrong result a = 26876030130522977362132073521581183346181374574161923861784515294359096339790317651642545453710861830, b = 77317036686803103778936280840587979061852865432165222860201467725250008729818881455247433896121539492, c = 23419441391667485230412027806848395891480806969028551095494276441653557878516815994557378094191773302 Test script: --------------- if(!empty($_GET['a']) && !empty($_GET['b']) && !empty($_GET['c'])) { echo bcpowmod($_GET['a'], $_GET['b'], $_GET['c']); } Expected result: ---------------- 7900166398097084738516054342209138549045537503223180351418154803251628881304583728795337234416935756 Actual result: -------------- 1214699235616625452989024013318099653900761106780848559004042547497269228234090040172747025.4033420042 ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=68703&edit=1