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class Employee{
    private $name;
    private $email;

    public function __construct($name, $email)
    {
        $this->name = $name;
        $this->email = $email;
    }
}

$objEmployee = new Employee('Sam', ‘sam@robustplus.com');

class Employee{
    private $name;
    private $email;

    public function __construct($name, $email)
    {
        $this->name = $name;
        $this->email = $email;
    }

    public function __destruct()
    {
        echo 'This will be called when the script stops.';
    }
}

$objEmployee = new Employee('Sam', ‘sam@robustplus.com');

 class Employee{
    private $data = array();

    public function __set($name, $value)
    {
        $this->data[$name] = $value;
    }

    public function __get($name)
    {
        If (isset($this->data[$name])) {
            return $this->data[$name];
        }
    }
}

$objEmployee = new Employee();
echo $objEmployee>phone;            // __get is called

class Employee{
    private $data = array();

    public function __set($name, $value)
    {
        $this->data[$name] = $value;
    }

    public function __get($name)
    {
        If (isset($this->data[$name])) {
            return $this->data[$name];
        }
    }
}

$objEmployee = new Employee();
$objEmployee>phone = '5879584623';              // __set is called
 

 class Employee{
    private $data = array();

    public function __isset($name)
    {
        return isset($this->data[$name]);
    }
}
$objEmployee = new Employee();
echo isset($objEmployee>phone);

$x = 10;  //global scope
$y = 12;
       function add() {
          global $x, $y;
          $y = $x + $y;
       }
addt();
echo $y;        // outputs 22

$x = 10;
$y = 12;
function multiply(){
    $GLOBALS['z'] = $GLOBALS['x'] * $GLOBALS['y'];
}
multiply();
echo $z; 

echo $_SERVER['SERVER_NAME'];
echo $_SERVER['SCRIPT_NAME'];

The output for the above code snippet is :
localhost
/demodoc/demo_global_server.php 

Hi <?php echo $_POST["name"]; ?>
Your email address is: <?php echo $_POST["email"]; >

The output of the above snippet will be:
Welcome Sam
Your email address is: sam@robustplus.com

<form action="reg.php" method="get">
Name: <input type="text" name="name">
Email: <input type="text" name="email">

Hi <?php echo $_GET["name"]; ?>
Your email address is <?php echo $_GET["email"]; ?>

The output then be:
Hi Sam
Your email address is sam@robustplus.com.

localhost/reg.php?name=Sam&email=sam%robustplus.com

<a href="#" onclick="document.getElementById('submit').submit(); >

$('#theme').change(function(){
$('form').submit();
});

if (isset($_POST['submit'])) {
    echo "Successful submission";
}

trait Trait1{
  //code
}

class MyClass {
use Trait1;
}

class Library{
     public function student(){
          echo "I am student A";
      }
}

require_once 'Library.php';
class Book extends Library{
}
$obj = new Book;
$obj->student();

class Ebook{
   public function version(){
     echo '1.0’;
   }
}

trait Ebook{
 public function version(){
   echo '1.0’;
  }
}

require_once ‘Library.php';
require_once ‘Ebook.php';
   class Book extends Library{
     use Ebook;
    }
$obj = new Book;
// now I can use methods inside trait Ebook

$obj->version();
//and methods from library

$obj->student();

require_once ‘Library.php';
require_once ‘Ebook.php'; 
require_once ‘Price.php'; 

   class Book extends Library{ 
       use Ebook, Price; 
   } 
$obj = new Book;
// now I can use methods inside trait Price
$obj->range(); 
// now I can use methods inside trait Ebook
$obj->version(); 
// and method from Library
$obj->student();

Ebook::range insteadof Price;
//Or pass it as an alias:
Price::range as Prange; 

class Colors{}
$yellow = new Colors;
$orange = new Colors; 

class Colors{
function set_name($name) {
    $this->name = $name;
  }
function get_name() {
    return $this->name;
  }
}
$yellow = new Colors;
$yellow>set_name('light');
echo $yellow>get_name();

class Colors{ public $shade; }
$yellow = new Colors;

class Colors{
  public $shade;
      function set_shade($name) {
         $this->shade = $shade;
       }
   }
$yellow = new Colors();
$yellow>set_shade("Light Yellow");

class Colors{
  public $shade;
}
$yellow = new Colors();
$yellow>shade = "Light Yellow";

$yellow = new Colors();
var_dump($yellow instanceof Colors);

The output will be bool(true). 

$colors = array("Red", "Yellow", "Oange"); 

echo "I like " . $colors[0] . ", " . $colors[1] . " and " . $colors[2] . "."; 

$rgb = array("R"=>"35", "G"=>"37", "B"=>"43"); 

echo "The R-value is " . $rgb[R] ;

$candidate = array (
  array("A",22,2),
  array("B",15,3),
  array("C",5,1)
);

echo $candidate[1][0].": Age: ".$candidate[1][1].", Experience: ".$candidate[1][2].".";

function Even($array)
{
	if($array%2==0)
	    return TRUE;
	else
	    return FALSE;
}
$array = array(12, 0, 1, 18, 25, 0, 46);
print_r(array_filter($array, "Even"));

Output: Array
(
    [0] => 12
    [1] => 0
    [2] => 18
    [3] => 0
    [5] => 46
)

$colors = array("Red", "Yellow", "Oange"); 
sort($colors); 

Output- Orange Red Yellow 

$colors = array("Red", "Yellow", "Oange"); 
sort($colors);

Output- Yellow Red Orange

function read_file($filename) {
    $file = fopen($filename, 'r');
    while (($line = fgets($file)) !== false) {
        yield $line;
    }
    fclose($file);
}
foreach (read_file(‘file_name’) as $line) {
}

function numbers() {
    for ($i = 0; $i < 6; ++$i) {
        $cmd = (yield $i);
        if ($cmd == 'stop') {
        return; // exit the generator
        }
    }
}
$generator = numbers();
foreach ($generator as $a) {
    if ($a == 4) {
        $generator->send('stop');
    }
    echo "{$a}";
}

In the above code, the generator will iterate till a is 4, output- 0 1 2 3 4 and terminate the execution. 

class Vehicle
{
    public function move()
    {
        echo "Move the car";
    }
}
class Car extends Vehicle
{
    public function accelarate()
    {
     move();
    }
$car = new Car();
$car->accelerate();
}

class Vehicle
{ 
    public function move() 
    { 
        echo "Move the car"; 
    } 
} 
class Car 
{ 
    private $vehicle; 
    public function __construct(Vehicle $vehicle)
    { 
        $this->vehicle = $vehicle; 
    } 
    public function accelarate() 
    { 
        $this->vehicle->move(); 
    } 
} 
$vehicle = new Vehicle(); 
$car = new Car($vehicle); 
$car->accelarate();

class Digital
{
    private $mobileMake;
    private $mobileModel;
    public function __construct($make, $model)
    {
        $this->mobileMake = $make;
        $this->mobileModel = $model;
    }
    public function getMakeAndModel()
    {
        return $this->mobileMake . ' ' . $this->mobileModel;
    }
}
class DigitalFactory
{
    public static function create($make, $model)
    {
        return new Digital($make, $model);
    }
}

$honor = DigitalFactory::create('Honor', '10 Lite');
print_r($honor>getMakeAndModel()); // outputs "Honor 10 Lite"

function hasMatchedParenthesis($string) {
        $len = strlen($string);
        $string_check = 1;
        $stack = [];
        for ($i = 0; $i < $len; $i++) {
            switch ($string[$i]) {
                case '(': array_push($stack, 0); 
                break;
                case ')':
                    if (array_pop($stack) !== 0)
                        return 0;
                break;
                case '[': array_push($stack, 1); 
                break;
                case ']':
                    if (array_pop($stack) !== 1)
                        return 0;
                break;
                case '{': array_push($stack, 1); break;
                case '}':
                    if (array_pop($stack) !== 1)
                        return 0;
                break;
                default:
                       $string_check = 0 ;
                break;
            }
        }
        return ($string_check ? empty($stack) : 0);
}

$result = hasMatchedParenthesis(")("); 
echo $result;

The above code will Output 0 (False). 

$x = 10;
$y = 5;
$z = 3;
if ($x / $y / $z)
    print "hi";
else
    print "hello"; 

The answer is A because the floating-point division in PHP returns a non zero value = 0.66 which evaluates to
true and outputs ‘hi’.

$x = 2

$y = 4

$z = 6

if($z > $y > $x) {

    echo “true”;

}else{

    echo “false”;

}

The answer is False. It may look like the output can be true because 6 > 4 > 2 is true but PHP evaluates
$z > $y first which returns a boolean value of 1 or true. This value (true or 1) is compared to the next integer
in the chain, bool(1) > $z, which will result in NULL and echo “false.”