GLOBAL AND LOCAL
SCOPE IMPLEMENTATION BY PHP PROGRAM
Variable with
global scope:
<html>
<body>
<?php
$x
= 5;
function myTest()
{
echo "<p>Variable x inside
function is: $x</p>";
}
myTest();
echo
"<p>Variable x outside function is: $x</p>";
?>
</body>
</html>
Output:
Variable
x inside function is:
Variable
x outside function is: 5
Variable
with local scope:
<html>
<body>
<?php
function myTest()
{
$x = 5;
echo "<p>Variable x
inside function is: $x</p>";
}
myTest();
echo "<p>Variable x outside function is: $x</p>";
?>
</body>
</html>
o/p: Variable x inside function is: 5
Variable x outside function
is:
PHP OBJECT IMPLEMENTATION
<html>
<body>
<?php
class Car {
public $color;
public $model;
public
function __construct($color, $model) {
$this->color = $color;
$this->model = $model;
}
public
function message () {
return
"My car is a " . $this->color . " " . $this->model .
"!";
}
}
$myCar = new Car("black",
"Volvo");
echo $myCar -> message();
echo "<br>";
$myCar = new Car("red", "Toyota");
echo $myCar -> message();
?>
</body>
</html>
O/p: My car is a black Volvo!
My car is a red Toyota!
ABSTRACT METHOD
USING PHP
<!DOCTYPE html>
<html>
<body>
<?php
abstract class ParentClass {
// Abstract
method with an argument
abstract
protected function prefixName($name);
}
class ChildClass extends ParentClass {
public
function prefixName($name) {
if ($name ==
"John Doe") {
$prefix =
"Mr.";
} elseif
($name == "Jane Doe") {
$prefix =
"Mrs.";
} else {
$prefix =
"";
}
return
"{$prefix} {$name}";
}}
$class = new ChildClass;
echo $class->prefixName("John Doe");
echo "<br>";
echo $class->prefixName("Jane Doe");
?>
</body></html>
ABSTRACT
CLASS IN PHP
<!DOCTYPE html>
<html>
<body>
<?php
// Parent class
abstract class Car {
public $name;
public
function __construct($name) {
$this->name = $name;
}
abstract
public function intro() : string;
}
// Child classes
class Audi extends Car {
public
function intro() : string {
return
"Choose German quality! I'm an $this->name!";
}
}
class Volvo extends Car {
public
function intro() : string {
return
"Proud to be Swedish! I'm a $this->name!";
}
}
class Citroen extends Car {
public
function intro() : string {
return
"French extravagance! I'm a $this->name!";
}
}
// Create objects from the child classes
$audi = new audi("Audi");
echo $audi->intro();
echo "<br>";
$volvo = new volvo("Volvo");
echo $volvo->intro();
echo "<br>";
$citroen = new citroen("Citroen");
echo $citroen->intro();
?>
</body>
</html>
INHERITANCE IMPLEMENTATION
<html>
<body>
<?php
class Fruit {
public $name;
public $color;
public
function __construct ($name, $color) {
$this->name = $name;
$this->color = $color;
}
public
function intro () {
echo
"The fruit is {$this->name} and the color is {$this->color}.";
}
}
// Strawberry is inherited from Fruit
class Strawberry extends Fruit {
public
function message () {
echo
"Am I a fruit or a berry? ";
}
}
$strawberry = new Strawberry ("Strawberry",
"red");
$strawberry->message ();
$strawberry->intro ();
?>
</body>
</html>
Am I a fruit or a berry? The fruit is
Strawberry and the color is red.
PHP - Overriding Inherited Methods
<html>
<body>
<?php
class Fruit {
public $name;
public $color;
public function __construct($name, $color) {
$this->name = $name;
$this->color = $color;
}
public function intro() {
echo "The fruit is {$this->name} and the color is
{$this->color}.";
}
}
class Strawberry extends Fruit {
public $weight;
public function __construct($name, $color, $weight) {
$this->name = $name;
$this->color = $color;
$this->weight = $weight;
}
public function intro() {
echo "The fruit is {$this->name}, the color is
{$this->color}, and the weight is {$this->weight} gram.";
}
}
$strawberry = new
Strawberry("Strawberry", "red", 50);
$strawberry->intro();
?>
</body>
</html>
The fruit is Strawberry, the color is
red, and the weight is 50 gram.
associative
array using for each() loop
<?php
// Declare an associative array
$aso_arr = array(
"Up"=>"North",
"Down"=>"South",
"Left"=>"West",
"Right"=>"East"
);
// Use foreach loop to traverse each
// elements of array and display its
// key and value
foreach($aso_arr as $side=>$direc) {
echo $side .
" => " . $direc . "\n";
}
?>
o/P: Up => North Down => South Left => West
Right => East
prime numbers between 1 to 100.
<?php
$limit
= 100;
$init
= 2;
while(TRUE)
{
$div
= 2;
if($init
> $limit)
{
break;
}
while(TRUE)
{
if($div
> sqrt($init))
{
echo
$init." ";
break;
}
if($init
% $div == 0)
{
break;
}
$div
= $div + 1;
}
$init
= $init + 1;
}
?>
Output: 2 3 5 7 11 13 17 19 23 29 31 37
41 43 47 53 59 61 67 71 73 79 83 89 97
<!DOCTYPE HTML>
<html>
<head>
</head>
<body>
<?php
// define variables and set to empty
values
$name = $email = $gender = $comment =
$website = "";
if ($_SERVER["REQUEST_METHOD"]
== "POST") {
$name = test_input($_POST["name"]);
$email = test_input($_POST["email"]);
$website = test_input($_POST["website"]);
$comment = test_input($_POST["comment"]);
$gender = test_input($_POST["gender"]);
}
function test_input($data) {
$data = trim($data);
$data = stripslashes($data);
$data = htmlspecialchars($data);
return $data;
}
?>
<h2>PHP Form Validation
Example</h2>
<form method="post"
action="<?php echo
htmlspecialchars($_SERVER["PHP_SELF"]);?>">
Name: <input type="text" name="name">
<br><br>
E-mail: <input type="text" name="email">
<br><br>
Website: <input type="text" name="website">
<br><br>
Comment: <textarea name="comment" rows="5"
cols="40"></textarea>
<br><br>
Gender:
<input type="radio" name="gender"
value="female">Female
<input type="radio" name="gender"
value="male">Male
<input type="radio" name="gender"
value="other">Other
<br><br>
<input type="submit" name="submit"
value="Submit">
</form>
<?php
echo "<h2>Your
Input:</h2>";
echo $name;
echo "<br>";
echo $email;
echo "<br>";
echo $website;
echo "<br>";
echo $comment;
echo "<br>";
echo $gender;
?>
</body>
</html>
count no
of words in a given string
<?php
$str="PHP
is nice";
echo "Your
string is:".$str;
echo
"<br>";
echo "By using str_word_count():
".str_word_count($str);
?>
Your string is:PHP is nice
By using str_word_count(): 3
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