Learning PHP

test.php

<?php
	$username = "Tom";
	echo $username
	echo "<br>";
	$current_user = $username
	echo $current_user;
	
	$y = 0;
	if( $y-- = 0)
		echo $y;
		echo "This is $y--";

	if( --$y = 0)
		echo $y;
		echo "This is $y--";
	
	// String concatenation
	$msg = 5
	echo "You have " . $msg . "messages.";
	// You have 5 messages.

	$var = "some"
	$var .= "body"
	//somebody

	// Test Difference
	$info = 'Preface variable with a $ like this: $variable';
	echo $info;

	// Variable substitution
	// In this example you don't need to use the . to concatenate the string
	echo "This week $count people have viewed your profile";

	// Escaping characters
	$text = 'My spelling\'s still sucks';
	echo $text;

	$text = "She wrote \"I don't what to have a pony\".";
	echo $text;
	
	// Special escape only can happen in "", double quotes
	$text = "Date\tName\tPayment\nNewLine:\rR_something";
	echo $text;

	// Won't work
	//Only \' and \\ work in '', single quotes
	$text = 'Date\tName\tPayment\nNewLine:\rR_something';
	echo $text;

	echo "This is 
	the longest
	line
	ever";

	/*
	echo <<<_END
	This is 
	the longest
	line
	ever
	_END;
	*/

	$number = 12345 * 67890;
	echo substr($number, 3, 1);

	function longdate($timestamp){
		// return date("l F js Y", $timestamp);
		$temp = date("l F js Y", $timestamp);
		return "The date is $temp";
	}

	echo longdate(time());

	// Print out date from 17 days ago
	echo longdate(time()-17*24*60*60);

	function static_varTest(){
		/// This will be skipped next time function is called
		static $count = 0;
		echo $count;
		$count++;
	}

	// The URL of the page that referred the user to the current web page. This referring page information can be accessed like this
	// PHP htmlentities function. It converts all characters into HTML entities to protect your code from hackers
	$came_from = htmlentities($_SERVER['HTTP_REFERER']);

	// Switch statement
	switch ($page)
	{
	case "Home":
		echo "You selected Home";
		break;
	case "About":
		echo "You selected About";
		break;
	case "News":
		echo "You selected News";
		break;
	case "Login":
		echo "You selected Login";
		break;
	case "Links":
		echo "You selected Links";
		break;
	default:
		echo "Unrecognized selection";
		break;
	}

	// While Loop
	$count = 0;
	while (++$count <= 12)
	{
		echo "$count times 12 is " . $count * 12 . "<br>";
		$count;
	}

	// do while Loop
	do
	{
		echo "$count times 12 is " . $count * 12;
		echo "<br>";
	} 
	while (++$count <= 12);

	// for Loops
	for ($count = 1 ; $count <= 12 ; ++$count)
	{
		echo "$count times 12 is " . $count * 12 . "<br>";
	}

	// Reverse string
	echo strrev(" .dlrow olleH");
	// Repeat string
	echo str_repeat("Hip ", 2);
	// String to uppercase
	echo strtoupper("hooray!");

	// String to lowercase
	echo strtolower('CARLO');
	
	// String uppercase first letter
	echo ucfirst(('carlo nyte');
	
	echo fix_names("WILLIAM", "henry", "gatES");
	function fix_names($n1, $n2, $n3)
	{
		$n1 = ucfirst(strtolower($n1));
		$n2 = ucfirst(strtolower($n2));
		$n3 = ucfirst(strtolower($n3));
		return $n1 . " " . $n2 . " " . $n3;
	}

	// Passing by Reference
	$a1 = "WILLIAM";
	$a2 = "henry";
	$a3 = "gatES";
	
	echo $a1 . " " . $a2 . " " . $a3 . "<br>";
	
	fix_names($a1, $a2, $a3);
	echo $a1 . " " . $a2 . " " . $a3;
	
	function fix_names(&$n1, &$n2, &$n3)
	{
		$n1 = ucfirst(strtolower($n1));
		$n2 = ucfirst(strtolower($n2));
		$n3 = ucfirst(strtolower($n3));
	}

	// Returning Global Variables
	$a1 = "WILLIAM";
	$a2 = "henry";
	$a3 = "gatES";
	
	echo $a1 . " " . $a2 . " " . $a3 . "<br>";
	fix_names();
	echo $a1 . " " . $a2 . " " . $a3;
	
	function fix_names()
	{
		global $a1; $a1 = ucfirst(strtolower($a1));
		global $a2; $a2 = ucfirst(strtolower($a2));
		global $a3; $a3 = ucfirst(strtolower($a3));
	}

	// Declaring a Class
	$object = new User;
	print_r($object);

	class User
	{
		public $name, $password;
		
		function save_user()
		{
			echo "Save User code goes here";
		}
	}

	// Creating and interacting with an object
	$object = new User;
	print_r($object); echo "<br>";

	$object->name = "Joe";
	$object->password = "mypass";
	print_r($object); echo "<br>";

	$object->save_user();

	class User
	{
		public $name, $password;
		
		function save_user()
			{
			echo "Save User code goes here";
			}
	}

	// Cloning an object
	$object1 = new User();
	$object1->name = "Alice";
	$object2 = clone $object1;
	$object2->name = "Amy";
	
	echo "object1 name = " . $object1->name . "<br>";
	echo "object2 name = " . $object2->name;
	
	class User
	{
		public $name;
	}

	// Creating a constructor method in PHP 5
	class User
	{
		function __construct($param1, $param2)
		{
		// Constructor statements go here
		public $username = "Guest";
		}
	}

	// Creating a destructor method in PHP 5
	class User
	{
		function __destruct()
		{
			// Destructor code goes here
		}
	}

	// Using the variable $this in a method
	class User
	{
		public $name, $password;
		function get_password()
		{
			return $this->password;
		}
	}

	// Creating and accessing a static method
	User::pwd_string();
	class User
		{
		static function pwd_string()
		{
			echo "Please enter your password";
		}
	}







?>