First Draft

First Draft of the Example Files

5/01.php

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+<?php
+  echo strrev(" .dlrow olleH"); // Reverse string
+  echo str_repeat("Hip ", 2);   // Repeat string
+  echo strtoupper("hooray!");   // String to upper case
+?>

5/02.php

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+<?php
+  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;
+  }
+?>

5/03.php

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+<?php
+  $names = fix_names("WILLIAM", "henry", "gatES");
+  echo $names[0] . " " . $names[1] . " " . $names[2];
+
+  function fix_names($n1, $n2, $n3)
+  {
+    $n1 = ucfirst(strtolower($n1));
+    $n2 = ucfirst(strtolower($n2));
+    $n3 = ucfirst(strtolower($n3));
+
+    return array($n1, $n2, $n3);
+  }
+?>

5/04.php

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+<?php
+  $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));
+  }
+?>

5/05.php

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+<?php
+  $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));
+  }
+?>

5/06.php

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+<?php
+  include("library.php");
+
+  // Your code goes here
+?>
+

5/07.php

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+<?php
+  include_once("library.php");
+
+  // Your code goes here
+?>
+
+

5/08.php

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+<?php
+  require_once("library.php");
+
+  // Your code goes here
+?>

5/09.php

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+<?php
+  if (function_exists("array_combine"))
+  {
+    echo "Function exists";
+  }
+  else
+  {
+    echo "Function does not exist - better write our own";
+  }
+?>

5/10.php

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+<?php
+  $object = new User;
+  print_r($object);
+
+  class User
+  {
+    public $name, $password;
+
+    function save_user()
+    {
+  	  echo "Save User code goes here";
+    }
+  }
+?>

5/11.php

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+<?php
+  $object = new User;
+  print_r($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";
+    }
+  }
+?>

5/12.php

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+<?php
+  $object1 = new User();
+  $object1->name = "Alice";
+  $object2 = $object1;
+  $object2->name = "Amy";
+
+  echo "object1 name = " . $object1->name . "<br>";
+  echo "object2 name = " . $object2->name;
+  
+  class User
+  {
+    public $name;
+  }
+?>

5/13.php

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+<?php
+  $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;
+  }
+?>

5/14.php

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+<?php
+  class User
+    {
+      function __construct($param1, $param2)
+    {
+      // Constructor statements go here
+      public $username = "Guest";
+    }
+  }
+?>

5/15.php

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+<?php
+  class Test
+  {
+    public $name = "Paul Smith"; // Valid
+    public $age = 42; // Valid
+    public $time = time(); // Invalid - calls a function
+    public $score = $level * 2; // Invalid - uses an expression
+  }
+?>

5/16.php

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+<?php
+  class User
+  {
+    public $name, $password;
+
+    function get_password()
+  {
+    return $this->password;
+  }
+?>

5/17.php

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+<?php
+  $object1       = new User();
+  $object1->name = "Alice";
+
+  echo $object1->name;
+
+  class User {}
+?>

5/18.php

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+<?php
+  class Test
+  {
+    public $name  = "Paul Smith"; // Valid
+    public $age   = 42;           // Valid
+    public $time  = time();       // Invalid - calls a function
+    public $score = $level * 2;   // Invalid - uses an expression
+  }
+?>

5/19.php

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+<?php
+  Translate::lookup();
+  
+  class Translate
+  {
+    const ENGLISH = 0;
+    const SPANISH = 1;
+    const FRENCH  = 2;
+    const GERMAN  = 3;
+    // ...
+
+    static function lookup()
+    {
+      echo self::SPANISH;
+    }
+  }
+?>

5/20.php

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+<?php
+  class Example
+  {
+    var $name = "Michael";   // Same as public but deprecated
+    public $age = 23;        // Public property
+    protected $usercount;    // Protected property
+
+    private function admin() // Private method
+    {
+      // Admin code goes here
+    }
+  }
+?>

5/21.php

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+<?php
+  User::pwd_string();
+
+  class User
+  {
+    static function pwd_string()
+    {
+      echo "Please enter your password";
+    }
+  }
+?>

5/22.php

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+<?php
+  $temp = new Test();
+
+  echo "Test A: " . Test::$static_property . "<br>";
+  echo "Test B: " . $temp->get_sp()        . "<br>";
+  echo "Test C: " . $temp->static_property . "<br>";
+
+  class Test
+  {
+    static $static_property = "I'm static";
+    function get_sp()
+
+    {
+      return self::$static_property;
+    }
+  }
+?>

5/23.php

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+<?php
+  $object           = new Subscriber;
+  $object->name     = "Fred";
+  $object->password = "pword";
+  $object->phone    = "012 345 6789";
+  $object->email    = "fred@bloggs.com";
+  $object->display();
+  
+  class User
+  {
+    public $name, $password;
+
+    function save_user()
+    {
+      echo "Save User code goes here";
+    }
+  }
+
+  class Subscriber extends User
+  {
+    public $phone, $email;
+
+    function display()
+    {
+      echo "Name: "  . $this->name     . "<br>";
+      echo "Pass: "  . $this->password . "<br>";
+      echo "Phone: " . $this->phone    . "<br>";
+      echo "Email: " . $this->email;
+    }
+  }
+?>

5/24.php

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+<?php
+  $object = new Son;
+  $object->test();
+  $object->test2();
+
+  class Dad
+  {
+    function test()
+    {
+      echo "[Class Dad] I am your Father<br>";
+    }
+  }
+
+  class Son extends Dad
+  {
+    function test()
+    {
+      echo "[Class Son] I am Luke<br>";
+    }
+
+    function test2()
+    {
+      parent::test();
+    }
+  }
+?>

5/25.php

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+<?php
+  $object = new Tiger();
+  echo "Tigers have...<br>";
+  echo "Fur: " . $object->fur . "<br>";
+  echo "Stripes: " . $object->stripes;
+
+  class Wildcat
+  {
+    public $fur; // Wildcats have fur
+
+    function __construct()
+    {
+      $this->fur = "TRUE";
+    }
+  }
+
+  class Tiger extends Wildcat
+  {
+    public $stripes; // Tigers have stripes
+
+    function __construct()
+    {
+      parent::__construct(); // Call parent constructor first
+      $this->stripes = "TRUE";
+    }
+  }
+?>

5/26.php

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+<?php
+  class User
+  {
+    final function copyright()
+    {
+      echo "This class was written by Joe Smith";
+    }
+  }
+?>

5/27.php

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+<?php
+  class User
+  {
+    final function copyright()
+    {
+      echo "This class was written by Joe Smith";
+    }
+  }
+?>