吴裕雄--天生自然PHP-MySQL-JavaScript学习笔记：PHP函数与对象

<?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));
  }
?>

<?php
  include("library.php");

  // Your code goes here
?>

<?php
  include_once("library.php");

  // Your code goes here
?>

<?php
  require_once("library.php");

  // Your code goes here
?>

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

<?php
  $object = new User;
  print_r($object);

  class User
  {
    public $name, $password;

    function save_user()
    {
        echo "Save User code goes here";
    }
  }
?>

<?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";
    }
  }
?>

<?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;
  }
?>

<?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;
  }
?>

<?php
  class User
  {
    function User($param1, $param2)
    {
      // Constructor statements go here
    }
  }
?>

<?php
  class User
  {
    function __construct($param1, $param2)
    {
      // Constructor statements go here
    }
  }
?>

<?php
  class User
  {
    function __destruct()
    {
      // Destructor code goes here
    }
  }
?>

<?php
  class User
  {
    public $name, $password;

    function get_password()
    {
      return $this->password;
    }
  }
?>

<?php
  User::pwd_string();

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

<?php
  $object1 = new User();
  $object1->name = "Alice";

  echo $object1->name;

  class User {}
?>

<?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
  }
?>

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

<?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
    }
  }
?>

<?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;
    }
  }
?>

<?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;
    }
  }
?>

<?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();
    }
  }
?>

<?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";
    }
  }
?>

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

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

<?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;
  }
?>

<?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);
  }
?>

<?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));
  }
?>