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Render arrays

Example:



  $con = Drupal\Core\Database\Database::getConnection();

  $start_value = 100000;

  $query = "ALTER TABLE {the_table} AUTO_INCREMENT = $start_value";

  $con->query($query);

Step 1:  Create a module. (Example)

Example :  Display user login form on a page

Example : (Insert this line in to your form submitForm() methode)

Redirect to the user page ( Redirection on form submit)

$form_state->setRedirect('user.page');

Step 1.

Check apache error log (use tail to show in real time)

# tail -f /var/log/apache2/error.log

Step 2 : 

Check MySQL database connection using mysql -uusername -ppassword

In drupal 8 block is part of the plugin system.

Step 1. Create a simple module like this.

Site Name:    

$site_name = \Drupal::config('system.site')->get('name');

 

Site Address (Host)

$site_addr = "http://" . \Drupal::request()->getHost();

Step 1. Install Xdebug

If not already ainstalled, Install Xdebug (I'ts already on the package WAML, LAMP, MAMP)

In Linux Debian/Ubuntu/Mint

# sudo apt-get install php5-xdebug

Comments are set as a field, so by default it is not present. To add comment field Goto:

Admin -> Structure -> Content types ->"YOUR CONTENT"

  ->Manage fields->Add field

  ->Select 'Comments' on 'Re-use an existing field' and Save.

Step 1. Connect to the server as root or execute commands as sudo

#sudo su

Step 2. remove all log files

rm -rf /var/log/apache2/*

rm -rf /var/log/virtualmin/*

....

Example:

Ignore files and folders using .gitignore

Example 1. Ignore (Exclude) a simple file or a folder

sites/default/settings.php

sites/*/files

Syatax (Usually used)

mysqldump --host=IP-OR-HOST --user=USERNAME --password=PASSWORD database_name > database_name.sql

mysqldump -h IP-OR-HOST -u USERNAME -pPASSWORD database_name > database_name.sql



1. Remove Files

Step 1. Switch to your branch

Strp 2. Remove files using -rm command

Ex :  git rm -r sites/all/modules/stage_file_proxy

Step 3. Add this file to the .gitignore

Tables

vertical-align: middle; is working in a TABLE, but not inside if a DIV

Move up/down

To move a background image (50px s=X 50px) to center of the previus line(50px to top).

1. Text-Align: Center;

div{

    text-align: center;

}

2. Margin: 0 auto;

.main-container {

&:before {

content: ''; position: absolute; height: 500px; background: red; width: 100%; left: 0;

} }

ALSO:

Add z-index: -1; if this hide some thing

.main-container is a div just after the body

Create Patch:

git diff PATH/TO/SOURCE.php > PATH/SAVE_patch.diff

Apply patch

git apply PATH/SAVE_patch.diff

#Download / Get git repository

git clone http://url-of-your-git/project.git

#Show remore url

git remote -v

Modal dialogue box ( bootstrap / jquery)

1. Remobe the gray background of modal dialog  box (modal-backdrop)

.modal-backdrop {

  background-color: transparent;

}

Modal dialogue box ( bootstrap / jquery)

1. Remobe the gray background of modal dialog  box (modal-backdrop)

.modal-backdrop {

  background-color: transparent;

}

2. Modal dialog  box Theming

Print : {{ variable_to_print }}

Code : {% codes %}

Comment : {# Comments #}

 

Example :

# Add a new CSS file:

stylesheets:

  all:

    - layout.css

Drupal Tutorial : https://www.drupal.org/simpletest