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store and read any property using __get and __set 
__get
and 
__set
magic methods allows us to get and set any variable without having individual getter and setter methods:
class Foo {
    protected $properties = array();

    public function __get( $key )
    {
        if(array_key_exists($key, $this->properties)){
            return $this->properties[$key];
        }
        return $this->properties[ $key ];
    }
    public function __set( $key, $value )
    {
        $this->properties[ $key ] = $value;
    }
}
$foo = new Foo();
$foo->name = 'David';

echo $foo->name;
In this example, we can set any variable, even if it does not exist. Every variable will be addd to 
properties
array
by Valeri Tandilashvili
4 years ago
0
PHP
OOP
3
__get & __set 
__get
and 
__set
methods are called when there is an attempt either to use or to set a new value to any of the class property
class Person{
    public $firstName;
 
    public function __get($propertyName){
        echo "attempted to read property: $propertyName" . PHP_EOL;
    } 
    public function __set($propertyNane, $propertyValue){
        echo "attempted to set new value to property: $propertyNane" . PHP_EOL;
    } 
}
 
$p = new Person();
 
$p->firstName = 'Doe';
echo $p->firstName . PHP_EOL;
 
$p->lastName = 'John';
echo $p->lastName;
If the property is 
public
, the methods are not going to be called (if the property does not exist, or exists but is not public, the methods will get called) If we make 
$firstName
property 
private
or 
protected
, the methods will be called for the 
$firstName
property 
__get
, 
__set
, 
__call
and 
__callStatic
are invoked when the method or property is inaccessible
by Valeri Tandilashvili
4 years ago
0
PHP
OOP
PHP Object Oriented Programming (OOP)
3
element.childNodes CODE
element.
childNodes
returns an array of an element's child nodes. JS
function setText() {
    let a = document.getElementById("demo");
     let arr = a.childNodes;
     for(let x=0;x<arr.length;x++) {
       arr[x].innerHTML = "new text";
     }
}

//calling the function with setTimeout to make sure the HTML is loaded
setTimeout(setText, 500);
HTML of the example
<div id ="demo">
  <p>some text</p>
  <p>some other text</p>
</div>
Note: The code above changes the text of both paragraphs to 
new text
by Valeri Tandilashvili
3 years ago
0
JavaScript
DOM
3
DOM element's important properties and methods
element.
childNodes
returns an array of an element's child nodes. element.
firstChild
returns the first child node of an element. element.
lastChild
returns the last child node of an element. element.
hasChildNodes
returns true if an element has any child nodes, otherwise false. element.
nextSibling
returns the next node at the same tree level. element.
previousSibling
returns the previous node at the same tree level. element.
parentNode
returns the parent node of an element.
by Valeri Tandilashvili
3 years ago
0
JavaScript
DOM
3
we can not use $this (object properties) inside static methods 
class Wheather {
    public $nonStatic = 0;
    public static $tempConditions = ['cold', 'mild', 'warm'];
    public static $someProperty = 5;

    static function celsiusToFarenheit($celsius) {
        return $celsius * 9 / 5 + 32 + $this->nonStatic;
    }
}

echo Wheather::celsiusToFarenheit(0);
echo "\n";
In this case we will get the error: 
Fatal error:  Uncaught Error: Using $this when not in object context
by Valeri Tandilashvili
4 years ago
0
PHP
OOP
3
we can use static properties inside object methods (non-static methods)
We can use static properties inside non-static methods but we can't use 
$this
inside static methods
class Circle {
    public static $pi = 3.1415926535;
    public $radius;
    
    public function __construct($radius) {
        $this->radius = $radius;
    }
    
    public function getArea() {
        return pow($this->radius, 2) * self::$pi;
    }
    
    public function getPerimeter() {
        return $this->radius * 2 * self::$pi;
    }
}

$circle1 = new Circle(5);
echo "\nArea: " . $circle1->getArea();
echo "\nPerimeter: " . $circle1->getPerimeter();
by Valeri Tandilashvili
4 years ago
0
PHP
OOP
3
badge inside h1-h6 tags 
<h1>Example heading <span class="badge badge-primary">New</span></h1>
<h2>Example heading <span class="badge badge-secondary">New</span></h2>
<h3>Example heading <span class="badge badge-warning">New</span></h3>
<h4>Example heading <span class="badge badge-success">New</span></h4>
<h5>Example heading <span class="badge badge-secondary">New</span></h5>
<h6>Example heading <span class="badge badge-secondary">New</span></h6>
by Valeri Tandilashvili
4 years ago
0
Bootstrap
badge
Bootstrap official doc
2
accessing nested JSON objects CODE
JSON object can have another JSON object as a child
var myObj = {
    "name":"John",
    "age":30,
    "cars": {
        "car1":"Ford",
        "car2":"BMW",
        "car3":"Fiat"
    }
}

// Accessing nested object properties
document.write(myObj.cars.car2);
document.write("<br />");
document.write(myObj.cars["car2"]);
document.write("<br />");
document.write(myObj["cars"]["car2"]);
by Valeri Tandilashvili
3 years ago
0
JSON
JavaScript
JS JSON
2
JSON comments
Comment is not supported in JSON but we can do the trick - to add the 
comment
inside the object as a 
property
{  
    "employee": {  
        "name": "George",   
        "a0ge": "30",   
        "city": "Tbilisi",   
        "comments": "The best student ever"  
    }  
}
by Valeri Tandilashvili
3 years ago
0
JSON
comments
JSON Tutorial
2
calculates how many days are between the dates
At first we need to create two 
datetime
objects using 
createFromFormat
static method of 
DateTime
built-in class
$first_date = DateTime::createFromFormat('Y-m-d', "2020-12-23");
$second_date = DateTime::createFromFormat('Y-m-d', "2020-12-30");
Using 
diff()
method of 
DateTime
class we actually calculate differences between the two dates and we get the result in days
$difference_between_the_days = $second_date->diff($first_date)->format("%a");
	
echo $difference_between_the_days;
by Valeri Tandilashvili
4 years ago
0
PHP
datetime
2
Results: 1578