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Valeri Tandilashvili's Personal Professional Blog
Results: 1024
absolute centering using flex properties 
.container {
    display: flex;
    justify-content: center;
    align-items: center;
}
border-bottom shothand 
border-bottom: 3px dashed orange;
The above style is a shorthand property of the following three properties:
border-bottom-width: 20px; 
border-bottom-style: dotted; 
border-bottom-color: blue;
font shorthand 
font: bold italic 14px Tahoma;
The above style is a shorthand property of the following four properties: 
font-weight: bold; 
font-style:italic; 
font-size: 14px; 
font-family: Tahoma;
composer search keyword1 keyword2
We can also search for more than one term by passing multiple arguments
composer search keyword1 keyword2
JSON arrays comparison with JavaScript arrays
In JSON: Array values must be of type 
string
, 
number
, 
object
, 
array
, 
boolean
or 
null
... In JavaScript: Array values can be all of the above, plus any other valid JavaScript expression, including 
functions
, 
dates
, 
undefined
, 
symbol
create database backup using mysqldump
Creates 
backup.sql
backup file of 
some_db
database using 
some_user
MySQL user. The database is located at 
34.mysql.servage.net
server.
mysqldump -h 34.mysql.servage.net -u some_user -p some_db > backup.sql
Creates 
backup.sql
backup file of 
some_db
database with the same MySQL user but without 
-h
flag. If the database is located on the same server (localhost) 
-h
flag is not necessary to specify
mysqldump -u some_user -p some_db > backup.sql
If we want to include all the routines (procedures, functions), then we need to use flag 
-R
mysqldump -u some_user -p some_db -R > backup.sql
If we want to export only one or several tables, then we should list tables after database name
mysqldump -u root -p sdtokens sdt_prices another_table > sdt_prices.sql
After running the command, we will be required to enter password of the 
some_user
mysql user. After that, MySQL will create 
backup.sql
file on the same location
method() -> chaining() with Bill CLASS example CODE
Method chaining technique gives us ability to call several methods with only one PHP expression (in one go)
class Bill {
    public $dinner = 20;
    public $dessert = 5;
    public $drink = 3;
    
    public $bill = 0;
    
    public function dinner($count) {
        $this->bill += $count * $this->dinner;
        return $this;
    }
    public function dessert($count) {
        $this->bill += $count * $this->dessert;
        return $this;
    }
    public function drink($count) {
        $this->bill += $count * $this->drink;
        return $this;
    }
}

$bill = new Bill;
We can call several methods one by one and print the 
$bill
:
$bill->dinner(3); 
$bill->dessert(2);
$bill->drink(1);
echo $bill->bill;
Or we can combine the above 4 expressions using method chaining. The result will be the same:
echo $bill->dinner(3)->dessert(2)->drink(1)->bill;
installing previous version of module
Installs exactly the specified version of the module
npm install moment@2.25.2
Installs the specified module with the latest 
patch
npm install moment@2.25
Installs the specified module with the latest 
minor
and 
patch
versions 
npm install moment@1
Installs the latest version of the module (with latest 
major
, 
minor
and 
patch
versions)
npm install moment
making elements draggable CODE
The drag and drop feature lets you 
grab
an object and drag it to a different location. To make an element draggable, we set the 
draggable
attribute to true. JS
function allowDrop(ev) {
    ev.preventDefault();
}
function drag(ev) {
    ev.dataTransfer.setData("text", ev.target.id);
}
function drop(ev) {
    ev.preventDefault();
    var data = ev.dataTransfer.getData("text");
    ev.target.appendChild(document.getElementById(data));
}
HTML
<div id="box" ondrop="drop(event)" ondragover="allowDrop(event)" style="border:1px solid black; width:200px; height:200px"></div>

<img id="image" src="https://image.shutterstock.com/image-photo/large-beautiful-drops-transparent-rain-260nw-668593321.jpg" draggable="true" ondragstart="drag(event)" width="150" height="50" alt="" />
calling non-static method from static method of the same class CODE
Several ways to call non-static method from static method: One way is to use 
new
keyword followed by the class name
(new Foo)->nonStaticMethod();
Another method is to use 
self
which comes after 
new
keyword
(new self)->nonStaticMethod();
Complete example:
class Foo {

    public function nonStaticMethod()
    {
        return 'non-static';
    }

    public static function staticMethod()
    {
        // return (new Foo)->nonStaticMethod();
        return (new self)->nonStaticMethod();
    }
}

echo Foo::staticMethod();
The second method 
new self
is better, because if we want to rename the class later, we will not need to change the class name more than one place
Results: 1024