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# create a new user (john for this example)
# just enter a password when asked, confirm it, and the other steps are optionals
sudo adduser john

# give root user the ownership of john's home directory
sudo chown root:root /home/john

# edit the ssh configuration file
sudo vim /etc/ssh/sshd_config

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<?php

/**
 * Given a string $haystack, search if it contains the string $needle and return
 * true or false. Return false if $haystack or $needle is empty.
 *
 * @param string $haystack
 * @param string $needle
 * @return bool
 */

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<?php defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * MY_Model class.
 * 
 * @extends CI_model
 */
class MY_Model extends CI_model {
	
	/**

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<?php
function starts_with($haystack, $needle) {
	
	// search backwards starting from haystack length characters from the end
	return $needle === "" || strrpos($haystack, $needle, -strlen($haystack)) !== false;
	
}

function ends_with($haystack, $needle) {
	

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## Paste all this SQL script in phpMyAdmin (SQL tab) ##
## WARNING: DON'T PUT ANY TRAILING SLASH AT THE END OF THE URL ##

# CHANGE WEBSITE URL

UPDATE wp_options
SET option_value = REPLACE(option_value, 'http://www.oldwebsite.fr', 'http://www.newwebsite.fr')
WHERE option_name = 'home' 
OR option_name = 'siteurl';

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<?php

/**
 * get_string_between function.
 *
 * Given a string ($string) and two delimiters ($start and $end), this function
 * returns the substring between $start and $end. $start and $end are also
 * removed.
 *
 * @link http://www.justin-cook.com/wp/2006/03/31/php-parse-a-string-between-two-strings/