Undefined offset: 0

[Chofoteddy]

What happen?

The list for cachegrind files is empty, even when there are files under the path shown in the page served by webgrind.

$ ls -l /private/tmp/cachegrid
total 183800
-rw-r--r--  1 chofoteddy  wheel   3097203 May  1 15:44 cachegrind.out.10829
-rw-r--r--  1 chofoteddy  wheel   3097417 May  1 15:44 cachegrind.out.10829.05a205
-rw-r--r--  1 chofoteddy  wheel       520 May  1 15:44 cachegrind.out.10829.061506
-rw-r--r--  1 chofoteddy  wheel       520 May  1 15:44 cachegrind.out.10829.08e0fc
-rw-r--r--  1 chofoteddy  wheel   3097033 May  1 15:44 cachegrind.out.10830
-rw-r--r--  1 chofoteddy  wheel   3095246 May  1 15:44 cachegrind.out.10830.0002e8
-rw-r--r--  1 chofoteddy  wheel   3803660 May  1 15:44 cachegrind.out.10830.019814
-rw-r--r--  1 chofoteddy  wheel       520 May  1 15:44 cachegrind.out.10830.074b2e
-rw-r--r--  1 chofoteddy  wheel   3097247 May  1 15:44 cachegrind.out.10830.077da9
-rw-r--r--  1 chofoteddy  wheel       520 May  1 15:44 cachegrind.out.10830.092476
-rw-r--r--  1 chofoteddy  wheel       520 May  1 15:44 cachegrind.out.10830.0aa128
-rw-r--r--  1 chofoteddy  wheel       520 May  1 15:44 cachegrind.out.10830.0cb162
-rw-r--r--  1 chofoteddy  wheel  22579326 May  1 15:44 cachegrind.out.10830.0e07a6
-rw-r--r--  1 chofoteddy  wheel       520 May  1 15:44 cachegrind.out.10830.0e9a67
-rw-r--r--  1 chofoteddy  wheel   3096110 May  1 15:44 cachegrind.out.10831
-rw-r--r--  1 chofoteddy  wheel   3145366 May  1 15:44 cachegrind.out.10831.029477
…

Console details:

$ composer serve
> php -S 0.0.0.0:8080 index.php
[Fri May  1 15:42:29 2020] 127.0.0.1:62991 [200]: /styles/style.css
[Fri May  1 15:42:29 2020] 127.0.0.1:62997 [200]: /styles/custom.css
[Fri May  1 15:42:29 2020] 127.0.0.1:63005 [200]: /js/jquery.tablesorter.js
[Fri May  1 15:42:29 2020] 127.0.0.1:63007 [200]: /js/jquery.selectboxes.js
[Fri May  1 15:42:29 2020] 127.0.0.1:63001 [200]: /js/jquery.js
[Fri May  1 15:42:29 2020] 127.0.0.1:63003 [200]: /js/jquery.blockUI.js
[Fri May  1 15:42:29 2020] 127.0.0.1:63009 [200]: /js/sprintf.js
[Fri May  1 15:42:29 2020] 127.0.0.1:63024 [200]: /img/reload.png
[Fri May  1 15:42:29 2020] 127.0.0.1:63028 [200]: /img/head.png
[Fri May  1 15:42:29 2020] 127.0.0.1:63038 [200]: /favicon.ico
[Fri May  1 15:42:48 2020] 127.0.0.1:63129 [200]: /styles/style.css
[Fri May  1 15:42:48 2020] 127.0.0.1:63133 [200]: /styles/custom.css
[Fri May  1 15:42:48 2020] 127.0.0.1:63139 [200]: /js/jquery.blockUI.js
[Fri May  1 15:42:48 2020] 127.0.0.1:63141 [200]: /js/jquery.tablesorter.js
[Fri May  1 15:42:48 2020] 127.0.0.1:63137 [200]: /js/jquery.js
[Fri May  1 15:42:48 2020] 127.0.0.1:63143 [200]: /js/jquery.selectboxes.js
[Fri May  1 15:42:48 2020] 127.0.0.1:63145 [200]: /js/sprintf.js
[Fri May  1 15:42:48 2020] 127.0.0.1:63159 [200]: /img/reload.png
[Fri May  1 15:42:48 2020] 127.0.0.1:63163 [200]: /img/head.png
[Fri May  1 15:42:48 2020] 127.0.0.1:63167 [200]: /favicon.ico
[Fri May  1 15:42:49 2020] 127.0.0.1:63183 [200]: /styles/style.css
[Fri May  1 15:42:49 2020] 127.0.0.1:63187 [200]: /styles/custom.css
[Fri May  1 15:42:49 2020] 127.0.0.1:63199 [200]: /js/sprintf.js
[Fri May  1 15:42:49 2020] 127.0.0.1:63195 [200]: /js/jquery.tablesorter.js
[Fri May  1 15:42:49 2020] 127.0.0.1:63197 [200]: /js/jquery.selectboxes.js
[Fri May  1 15:42:49 2020] 127.0.0.1:63191 [200]: /js/jquery.js
[Fri May  1 15:42:49 2020] 127.0.0.1:63193 [200]: /js/jquery.blockUI.js
[Fri May  1 15:42:49 2020] 127.0.0.1:63213 [200]: /img/reload.png
[Fri May  1 15:42:49 2020] 127.0.0.1:63217 [200]: /img/head.png
[Fri May  1 15:42:49 2020] 127.0.0.1:63221 [200]: /favicon.ico
[Fri May  1 15:42:50 2020] 127.0.0.1:63237 [200]: /styles/style.css
[Fri May  1 15:42:50 2020] 127.0.0.1:63241 [200]: /styles/custom.css
[Fri May  1 15:42:50 2020] 127.0.0.1:63247 [200]: /js/jquery.blockUI.js
[Fri May  1 15:42:50 2020] 127.0.0.1:63249 [200]: /js/jquery.tablesorter.js
[Fri May  1 15:42:50 2020] 127.0.0.1:63245 [200]: /js/jquery.js
[Fri May  1 15:42:50 2020] 127.0.0.1:63251 [200]: /js/jquery.selectboxes.js
[Fri May  1 15:42:50 2020] 127.0.0.1:63253 [200]: /js/sprintf.js
[Fri May  1 15:42:50 2020] 127.0.0.1:63267 [200]: /img/reload.png
[Fri May  1 15:42:50 2020] 127.0.0.1:63271 [200]: /img/head.png
[Fri May  1 15:42:50 2020] 127.0.0.1:63275 [200]: /favicon.ico
[Fri May  1 15:42:55 2020] 127.0.0.1:63305 [200]: /styles/style.css
[Fri May  1 15:42:55 2020] 127.0.0.1:63307 [200]: /styles/custom.css
[Fri May  1 15:42:56 2020] 127.0.0.1:63319 [200]: /styles/style.css
[Fri May  1 15:42:56 2020] 127.0.0.1:63324 [200]: /styles/custom.css
[Fri May  1 15:42:56 2020] 127.0.0.1:63325 [200]: /js/jquery.js
[Fri May  1 15:42:56 2020] 127.0.0.1:63328 [200]: /js/jquery.blockUI.js
[Fri May  1 15:42:56 2020] 127.0.0.1:63330 [200]: /js/jquery.tablesorter.js
[Fri May  1 15:42:57 2020] 127.0.0.1:63333 [200]: /js/jquery.selectboxes.js
[Fri May  1 15:42:57 2020] 127.0.0.1:63339 [200]: /js/sprintf.js
[Fri May  1 15:42:57 2020] 127.0.0.1:63349 [200]: /img/reload.png
[Fri May  1 15:42:57 2020] 127.0.0.1:63353 [200]: /img/head.png
[Fri May  1 15:42:57 2020] 127.0.0.1:63363 [200]: /favicon.ico
[Fri May  1 15:43:13 2020] PHP Notice:  Undefined offset: 0 in /Users/user/Downloads/webgrind-master/index.php on line 41
[Fri May  1 15:43:13 2020] PHP Stack trace:
[Fri May  1 15:43:13 2020] PHP   1. {main}() /Users/user/Downloads/webgrind-master/index.php:0
ld: warning: option -s is obsolete and being ignored
[Fri May  1 15:43:18 2020] PHP Warning:  fread(): Length parameter must be greater than 0 in /Users/user/Downloads/webgrind-master/library/Reader.php on line 247
[Fri May  1 15:43:18 2020] PHP Stack trace:
[Fri May  1 15:43:18 2020] PHP   1. {main}() /Users/user/Downloads/webgrind-master/index.php:0
[Fri May  1 15:43:18 2020] PHP   2. Webgrind_FileHandler->getTraceReader() /Users/user/Downloads/webgrind-master/index.php:43
[Fri May  1 15:43:18 2020] PHP   3. Webgrind_Reader->__construct() /Users/user/Downloads/webgrind-master/library/FileHandler.php:169
[Fri May  1 15:43:18 2020] PHP   4. Webgrind_Reader->init() /Users/user/Downloads/webgrind-master/library/Reader.php:76
[Fri May  1 15:43:18 2020] PHP   5. Webgrind_Reader->read() /Users/user/Downloads/webgrind-master/library/Reader.php:91
[Fri May  1 15:43:18 2020] PHP   6. fread() /Users/user/Downloads/webgrind-master/library/Reader.php:247

HTTP details (HAR file): webgrind-2020-05-01.har.txt

Env details:

PHP 7.3.17 (cli) (built: May  1 2020 13:41:11) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.3.17, Copyright (c) 1998-2018 Zend Technologies
    with Xdebug v2.7.2, Copyright (c) 2002-2019, by Derick Rethans
    with Zend OPcache v7.3.17, Copyright (c) 1999-2018, by Zend Technologies

[Chofoteddy]

This issue seems related to https://github.com/jokkedk/webgrind/issues/6.

[DieterHolvoet]

Having the same issue, maybe the format of cachegrind files changed? If you want I can send you an example file.

[alpha0010]

I can attempt to take a look soon. It would be helpful if you could provide:

• Any warnings/errors from logs (e.g. apache, php, etc.)
• PHP version
• Xdebug version
• OS version
• Cachegrind file with this problem (ideally produced from a minimal script, e.g. two or three functions and a print)