Elastic search start stop

Start
sudo service elasticsearch start
Stop
sudo service elasticsearch stop

show process memory usage ubuntu

ps aux --sort=-%mem | awk 'NR<=10{print $0}'

remove (delete) folder and its coontent in ubuntu terminal

sudo rm -r

copy content of folder to another folder

see what owner of files is (for sake).

sudo cp -a /source/. /dest/

this should copy all files and in my case assign right owner.
If not cd to the dest folder and use

sudo chown www-data:www-data *

Nginx test && reload

sudo nginx -t && sudo nginx -s reload

Install updates on ubuntu cmd

sudo apt-get update && sudo apt-get upgrade

How to remove permanently last commit from git remote

To only remove commit but save current code use:

git reset --soft HEAD~1
...make new commit and then
git push origin master --force


To remove commit and remove commit's code use:

git reset --hard HEAD~1
git push origin master --force

how to create helpers file laravel5

Simple tip for simple stuff.

create folder Helpers in app directory
create file StringHelper.php in app\Helpers

<?php
namespace App\Helpers;
class StringHelper
{
public static function getCleanString($string)
{
//remove unnecessary chars
$string = str_replace(['-', ' '], '', $string);
return str_slug($string);
}
}

add any simple function in this class as static.

when you need a different helper, create new class for example YoutubeHelper.php and add there stuff you need.

usage

\App\Helpers\StringHelper::getCleanString($name)

PHP format tree comments, categories, nested sets

Simple function for formatting tree. One cons - you need to pass all items (all comments of the post) to format them.

<?php

function formatTree($tree, $parent)
{
    $tree2 = array();
    foreach ($tree as $item) {
        if ($item['parent_id'] == $parent) {
            $tree2[$item['id']] = $item;
            $tree2[$item['id']]['child'] = formatTree($tree, $item['id']);
        }
    }

    return $tree2;
}


//for demo
$beforeTree = [
    ['id' => 1, 'parent_id' => 0],
    ['id' => 2, 'parent_id' => 1],
    ['id' => 3, 'parent_id' => 2],
    ['id' => 4, 'parent_id' => 0],
    ['id' => 5, 'parent_id' => 4],
    ['id' => 6, 'parent_id' => 4],
];
$afterTree = formatTree($beforeTree, 0);

var_dump($afterTree);

Clear Laravel configuration cache

php artisan config:clear 

Redis stop Redis start

if you have properly installed redis as server just run
sudo systemctl restart redis

If not casually:
to stop redis

redis-cli shutdown 

to start redis

redis-server