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Valeri Tandilashvili's Personal Professional Blog
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copy text to clipboard with break lines
If we need to copy text to clipboard with break lines, than we need to use 
textarea
instead of using 
input
element 
function copy(part1, part2) {

    // Creates textarea element 
    var textarea = document.createElement('textarea');

    // Puts the text into the textarea with breaklines
    textarea.value = part1 + "\n\n" + part2

    // Adds the element to the DOM
    document.body.appendChild(textarea);

    // Selects the text that we want to copy
    textarea.select();

    // Copies the selected text clipboard
    var result = document.execCommand('copy');

    // Removes the element from the DOM because we no longer need it
    document.body.removeChild(textarea);
    return result;
}
method() -> chaining() 
class Say {
    public function let() {
        echo 'Let' . " ";
        return $this;
    }
    public function me() {
        echo 'Me' . " ";
        return $this;
    }
    public function tell() {
        echo 'Tell' . " ";
        return $this;
    }
    public function you() {
        echo 'You' . " ";
        return $this;
    }
    public function something() {
        echo 'Something' . " ";
    }
}
$phrase = new Say;
$phrase->let()->me()->tell()->you()->something();
__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
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
authenticated user's posts
Lists logged in user's posts on dashboard
$user_id = auth()->user()->id;
$user = User::find($user_id);
return view('dashboard')->with('posts', $user->posts);
git commit (insert mode)
After the command
git commit
-> 
i
- to jump into insert mode -> 
esc
- takes us out of insert mode -> 
:w
- to save written comment -> 
:q
- to quit ------------------------ 
:w
and 
:p
can be combined into 
:wq
PHP For loop CODE 
if
has only one section: 
Condition
if (Condition) {
    // Code to be executed
}
for
loop has three sections divided by 
;
for (Initialization;   Condition;   Increment/Decrement) {
    // Code to be executed
}
The loop prints numbers from 0 to 10 
for ($i = 0;  $i < 10;  $i ++) {
	echo $i . "\n";
}
User-defined functions CODE
Function that does something
function printGreeting() {
	print "Prints: Hello world!\n";
}
printGreeting();
Function that returns something 
function returnGreeting() {
	return "Returns: Hello world!\n";
}
echo returnGreeting();
Parameterized function that doubles the number 
function doubleMe($number) {
	$result = "$number times 2 is: " . $number * 2 . "\n";
	return $result;
}
echo doubleMe(4);
Function calculates the sum of two numbers 
function add($num1, $num2) {
	$sum = $num1 + $num2;
	$result = "Sum of $num1 and $num2 is: $sum";
	return $result;
}
echo add(4, 5);
PHP if-else statement CODE
The code will output "Have a nice weekend!" if the current day is Friday, otherwise - "Have a nice day!" 
$d = date("D");
if($d == "Fri"){
    echo "Have a nice weekend!";
} else{
    echo "Have a nice day!";
}
echo "\n";
Output "Have a good day!" if the current time is less than 20, and "Have a good night!" otherwise: 
$t = date("H");
if ($t < "20") {
    echo "Have a good day!";
} else {
    echo "Have a good night!";
}
If 
$age
is more than 
18
, prints 
Adult
otherwise prints 
Child
$age = 20;
if ($age > 18) {
    echo 'Adult';	
} else {
    echo 'Child';	
}
String functions CODE
Function 
strlen()
returns the length of the string 
echo strlen("Hello world!")."\n"; // 12
Function 
strrev()
returns the Reverse of the string 
echo strrev("Hello world!")."\n"; // !dlrow olleH
Function 
strpos()
tries to find the second parameter and returns its index 
echo strpos("Hello world!", "world")."\n"; // 6
Function 
str_replace()
replaces the word "Hello" with "Hi" 
echo str_replace("Hello", "Hi", "Hello there")."\n"; // Hi there
Function 
substr()
returns the substring between given indexes 
echo substr("Hello world", 6)."\n"; // world
echo substr("Hello world", 6, 3)."\n"; // wor
echo substr("Hello world", -5)."\n"; // world
echo substr("Hello world", -4, 2)."\n"; // or
Function 
trim()
removes whitespaces from sides of the string 
echo trim("   Hello World  ").".\n"; // Hello World.
// Removes whitespaces from the right end
echo rtrim("   Hello World  ")."\n"; //    Hello World
// Removes Exclamation mark from the right end
echo rtrim("Hello World!", "!")."\n"; // Hello World
Function 
strtoupper()
converts the string to upper case 
echo strtoupper("Hello World")."\n";
Function 
strtolower()
converts the string to lower case 
echo strtolower("Hello World")."\n";
Function 
explode()
breaks the string by its delimiter 
print_r (explode(" ", "It's the first day of the course!"));
Function 
implode()
joins the array element based on the delimiter and returns the string 
echo implode(" ", ['Hello', 'World']);
Results: 1022