PHP Mediawiki Eclipse debugging

Trying to get https://www.semantic-mediawiki.org/wiki/User:WolfgangFahl/Workdocumentation_2015-12-27 working again

Environment

2020-10-11

• LAMP Intranet MediaWiki 1.35 with no security needs in a VMWare environment

lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 20.04.1 LTS
Release:	20.04
Codename:	focal
apachectl -V
Server version: Apache/2.4.41 (Ubuntu)
Server built:   2020-08-12T19:46:17
mysql --version
mysql  Ver 15.1 Distrib 10.3.22-MariaDB, for debian-linux-gnu (x86_64) using readline 5.2
php --version
PHP 7.4.3 (cli) (built: May 26 2020 12:24:22) ( NTS )
Copyright (c) The PHP Group
Zend Engine v3.4.0, Copyright (c) Zend Technologies
    with Zend OPcache v7.4.3, Copyright (c), by Zend Technologies
    with Xdebug v2.9.2, Copyright (c) 2002-2020, by Derick Rethans

2020-02-09

• LAMP Intranet MediaWiki 1.33 with no security needs in a VMWare environment

lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 18.04.4 LTS
Release:	18.04
Codename:	bionic
apachectl -V
Server version: Apache/2.4.29 (Ubuntu)
Server built:   2019-09-16T12:58:48
mysql --version
mysql  Ver 14.14 Distrib 5.7.29, for Linux (x86_64) using  EditLine wrapper
php --version
PHP 7.2.24-0ubuntu0.18.04.2 (cli) (built: Jan 13 2020 18:39:59) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.2.0, Copyright (c) 1998-2018 Zend Technologies
    with Zend OPcache v7.2.24-0ubuntu0.18.04.2, Copyright (c) 1999-2018, by Zend Technologies

Install eclipse php

2020-02

cd /usr/local/src
# download eclipse-php-2019-12-R-linux-gtk-x86_64.tar.gz  from
# https://www.eclipse.org/downloads/
sudo tar xvfz eclipse-php-2019-12-R-linux-gtk-x86_64.tar.gz

2020-10

Use Installer from e.g. https://ftp.snt.utwente.nl/pub/software/eclipse/oomph/epp/2020-09/R/eclipse-inst-jre-linux64.tar.gz and select Eclipse IDE for PHP Developers

cd /usr/local/src
wget https://ftp.snt.utwente.nl/pub/software/eclipse/oomph/epp/2020-09/R/eclipse-inst-jre-linux64.tar.gz
tar xvfz eclipse-inst-jre-linux64.tar.gz 
cd eclipse-installer
./eclipse-inst
# select Eclipse IDE for PHP Developers
# Installation Folder: /usr/local/src/eclipse

Desktop icon

~/Desktop$ cat eclipse.desktop 
[Desktop Entry]
Type=Application
Terminal=false
Name=Eclipse
Exec=/usr/local/src/eclipse/eclipse
Comment=Eclipse 2019 Integrated development environment
Icon=/usr/local/src/eclipse/icon.xpm
StartupWMClass=Eclipse

Install Mediawiki

see https://www.mediawiki.org/wiki/Manual:Running_MediaWiki_on_Debian_or_Ubuntu

sudo apt-get install apache2 mysql-server php php-mysql libapache2-mod-php php-xml php-mbstring

Mediawiki 1.33.2

/usr/local/src$ sudo wget https://releases.wikimedia.org/mediawiki/1.33/mediawiki-1.33.2.tar.gz
wf@fur:/var/www/html$ sudo tar xvfz /usr/local/src/mediawiki-1.33.2.tar.gz
sudo ln -s mediawiki-1.33.2 wiki

Mediawiki 1.35

/usr/local/src$ sudo wget wget https://releases.wikimedia.org/mediawiki/1.35/mediawiki-1.35.0.tar.gz
wf@fur:/var/www/html$ sudo tar xvfz /usr/local/src/mediawiki-1.35.0.tar.gz
rm wiki
wf@fur:/var/www/html$ ln -s mediawiki-1.35.0/ wiki

Configure Localsettings.php

set mysql root password

Ubuntu 18.04 / mysql

• https://www.digitalocean.com/community/tutorials/so-installieren-sie-mysql-auf-ubuntu-18-04-de

Ubuntu 20.04 /mardiab

mysql_secure_installation

follow steps

and download LocalSettings.php

make phpinfo.php available

<?php
  phpinfo();

Install Xdebug

sudo apt-get install php-xdebug php-dev php-curl

2020-02

sudo apt install php-pear
sudo pecl channel-update pecl.php.net
sudo pecl install xdebug

Create first project

New Project "loop" add loop.php in include_path/loop folder

<?php
for ($i = 1; $i <= 10; $i++) {
    echo $i;
}

1. Try Run / Debug as PHP CLI Application
2. You'll be asked to add PHP env
3. Click "add" to add a New PHP Executable
4. use /usr/bin/php as Executable path
5. use system default php.ini
6. Click "finish"
7. Click "Apply and Close"
8. Try Run/Debug as PHP CLI Application again
9. Set breakpoints and debug

2020-10

Also need to configure debugger as asked for by Eclipse - use xdebug.

Create MediaWiki Project

make sure your user is part of group www-data

/var/www/html$ sudo chown www-data.www-data mediawiki-1.33.2
/var/www/html$ sudo chmod g+w mediawiki-1.33.2/
/var/www/html$ sudo chown -R www-data.www-data wiki

Create Eclipse project with "open project from existing source" using /var/www/html/wiki as the source folder

Enable composer in Project's properties There should be only some 20 errors and 60 warnings. Mostly the errors are XMLProblems and ComposerHook ComposerPack issues which are hopefully not relevant.

DLTK Indexing

When first loading the project the DLTK indexing will take place and might take a while ...

• https://stackoverflow.com/questions/13345011/dltk-indexing-in-progress

Debugging

Setting Eclipse PHP Debug Preferences

Personally I think break on first line isn't helpful because it triggers to often.

Setting breakpoints

Set your breakpoints e.g. in the code e.g. of an extension. Then click index.php and right click "Run Debug as PHP Web Application". You'll be asked for the URL to debug

After clicking "debug" the code will hopefully halt at one of your breakpoints and you can inspect what is going on.

Add Extension to debug

e.g. S5SlideShow

{
	"require": {
		"wikimedia/at-ease": "*"
	}
}

wget https://getcomposer.org/composer.phar
sudo php composer.phar update

Debug Extension

• https://www.eclipse.org/pdt/help/html/debugging_a_php_web_page.htm

XDebug

2020-02

/etc/php/7.2/mods-available$ cat xdebug.ini 
zend_extension=xdebug.so
xdebug.remote_enable=On
sudo service apache2 restart

2020-10

/etc/php/7.4/apache2/conf.d# cat 20-xdebug.ini 
zend_extension=xdebug.so
xdebug.remote_enable=On
# only use when really debugging will slow down your apache quite a bit
# https://stackoverflow.com/a/19273025/1497139
#xdebug.remote_autostart=1

try Zend Debugger

Did not work ...

Download

drwxrwxr-x 3 wf   wf        4096 Feb 23  2017 ZendDebugger-linux-x86_64
-rw-rw-r-- 1 wf   wf     1169184 Feb  8 17:01 ZendDebugger-linux-x86_64.tar.gz

steps tried

see https://askubuntu.com/questions/1002252/installing-configuring-zend-debugger-for-eclipse-pdt

1. copy dummy.php to webroot

cat 20-zend.ini 
zend_extension=/usr/local/src/ZendDebugger-linux-x86_64/php-7.0.x/ZendDebugger.so
zend_debugger.allow_hosts=127.0.0.1,2.0.0.21
zend_debugger.expose_remotely=allowed_hosts
zend_debugger.tunnel_min_port=1025
zend_debugger.tunnel_max_port=65534