Bug #75187 [Opn->Nab]: Unexpected extra characters output in file/page.

Edit report at https://bugs.php.net/bug.php?id=75187&edit=1 ID: 75187 Updated by: requinix@php.net Reported by: frederic dot nicolas_xkpad at laposte dot net Summary: Unexpected extra characters output in file/page. -Status: Open +Status: Not a bug Type: Bug Package: *General Issues Operating System: DSM 6.1.3-15152 Update 4 PHP Version: 7.0.23 Block user comment: N Private report: N New Comment: Don't rely on what you see rendered in the browser to know what PHP did. Always View Source. It may very well have been a bug with Chrome; I searched through the Chromium bug tracker briefly but didn't see anything. Previous Comments: ------------------------------------------------------------------------ [2017-09-15 07:11:12] frederic dot nicolas_xkpad at laposte dot net @requinix : Thx for your feedback, after a while your point (..end with ?>) get to me => I've tried with other browsers than chrome and was not able to reproduce the bug, while it is systematic with chrome. So I guess this is more a browser bug than a PHP bug. Furthermore, I do not use the latest version of chrome... Sorry to have took of your time. It took a while for me to get what was bugging & because the bug was related to the PHP code (changing $z was changing the place of the unexpected character) I (wrongly)thought it was PHP dependant. ------------------------------------------------------------------------ [2017-09-15 06:37:22] frederic dot nicolas_xkpad at laposte dot net I've received some comments indicating that 'this is not true'. Well just try the sample code & see for yourself. The bug happens on php 5 & 7. I suppose this is an overflow. Make sure to use $z=98270 (and not different value) otherwise the extra character will not appear in the very short code I've put after the ?> to make the sample code. If longer code is used after ?> then other value for $z can be used. This bug appeared in my real code (where $z of course was not a loop but include, echo & the like) ------------------------------------------------------------------------ [2017-09-11 13:56:31] requinix@php.net This is highly unlikely to be a bug with PHP. Keep looking. ------------------------------------------------------------------------ [2017-09-11 12:58:51] spam2 at rhsoft dot net this is simply not true and even not possible with the code you have given because PHP ends with "?>" and anything after that is echoed as it is - you pretty sure took some random code as sample while there where you see that output much more and likely output buffers are involved [harry@rh:/mnt/data/downloads]$ php test.php <html> qqqqqqqqqq<script> <!-- <a --> </script> </html> [harry@rh:/mnt/data/downloads]$ cat test.php <html> <?php $z = 10; for ($i=0; $i<$z; $i++) echo "q"; ?> <script> <!-- <a --> </script> </html> ------------------------------------------------------------------------ [2017-09-11 12:40:39] frederic dot nicolas_xkpad at laposte dot net Description: ------------ Unexpected extra characters output in file/page, creating not working page when these unexpected characters interfer with JS/Html code in the output page. Exemple provided. According to tests on my side regarding this exemple: - can change the letter "a" (in "<a") to whatever letter + add other letters - cannot suppress other character after "<script>" but lot more character can be added in the <script>..</script> part - the position of the unexpected extra character changes according to the number of characters/line in the <script>..</script> part In the code where I noticed the problem, there where many characters before the <script> part, which itself included several JS functions. The unexepected extra character make the JS not working. Test script: --------------- <html> <?php $z = 98270; for ($i=0; $i<$z; $i++) echo "q"; ?> <script> <!-- <a --> </script> </html> Expected result: ---------------- <html> ....qq<script> <!-- <a --></script> </html> Actual result: -------------- <html> ....qq<script> <!-- <a --></a/script> </html> ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=75187&edit=1