Learning PHP and MySQL
Thursday, August 03, 2006
Example 05-16 Accessing the $age variable using this-->
<?php
class Cat {
// How old the cat is var $age;
// Constructor
function Cat($new_age)
{
// Set the age of this cat to the new age
$this->age = $new_age;
}
//The birthday method increments the age variable
function Birthday()
{
$this->age++;
}
}
// Create a new instance of the cat object that’s one year old
$fluffy=new Cat(1);
echo "Age is $fluffy->age <br/>";
echo "Birthday<br/>";
// Increase fluffy’s age
$fluffy->Birthday();
echo "Age is $fluffy->age <br/>";
?>
Posted by krautgrrl on 08/03 at 08:24 AM
Chapter 5 Code • (0) Comments • (79) Trackbacks • Permalink
Chapter 5 Code • (0) Comments • (79) Trackbacks • Permalink
Example 05-17 Using the extends keyword to define a subclass
<?php
class Cat {
// How old the cat is var $age;
function Cat($new_age)
{
// Set the age of this cat to the new age
$this->age = $new_age;
}
function Birthday()
{
$this->age++;
}
}
class Domestic_Cat extends Cat {
// Constructor
function Domestic_Cat() {
}
// Sleep like a domestic cat
function sleep() {
echo("Zzzzzz.<br/>");
}
}
$fluffy=new Domestic_Cat();
$fluffy->Birthday();
$fluffy->sleep();
echo "Age is $fluffy->age <br>/";
?>
Example 05-18 Using the parent construct
<?php
class Cat {
// How old the cat is var $age;
function Cat($new_age)
{
// Set the age of this cat to the new age
$this->age = $new_age;
}
function Birthday()
{
$this->age++;
}
function Eat()
{
echo "Chomp chomp.";
}
function Meow()
{
echo "Meow.";
}
}
class Domestic_Cat extends Cat {
// Constructor
function Domestic_Cat() {
}
// Eat like a Domestic_Cat
function eat() {
parent::eat();
// After we're finished eating, let's meow
$this->meow();
}
}
?>
Example 05-19 Calling the constructor of the parent class
<?php
class Cat {
// How old the cat is var $age;
function Cat($new_age)
{
// Set the age of this cat to the new age
$this->age = $new_age;
}
function Birthday()
{
$this->age++;
}
function Eat()
{
echo "Chomp chomp.";
}
function Meow()
{
echo "Meow.";
}
}
class Domestic_Cat extends Cat {
// Constructor
function Domestic_Cat($new_age) {
// This will call the constructor
// in the parent class (the superclass)
parent::Cat($new_age);
}
}
?>
Example 05-20 Using the -> operator to call hypnotize
<?php
class Hypnotic_Cat extends Cat {
// Constructor
function Hypnotic_Cat() {
}
// This is meant to be called statically function
hypnotize() {
//detects that the function is being called statically
//since a static call doesn’t have an object to point to
if ($this == null)
echo ("All cats are hypnotized.");
else
{
echo ("The cat was hypnotized.");
return;
}
}
}
// Hypnotize all cats
Hypnotic_Cat::hypnotize();
$hypnotic_cat = new Hypnotic_Cat();
// Does nothing
$hypnotic_cat->hypnotize();
?>
Example 05-21 Referencing the $some_variable
<?php
$some_variable = "Hello World!";
$some_reference = &$some_variable;
$some_reference = "Guten Tag World!";
echo $some_variable;
echo $some_reference;
?>
Posted by krautgrrl on 08/03 at 08:26 AM
Chapter 5 Code • (0) Comments • (810) Trackbacks • Permalink
Chapter 5 Code • (0) Comments • (810) Trackbacks • Permalink
Monday, August 07, 2006
Example 06-01 Using the array function to create an array of weekdays
<?php
$weekdays=array('Monday',
'Tuesday',
'Wednesday',
'Thursday',
'Friday',
'Saturday',
'Sunday');
?>
Example 06-02 Creating an associative array of shapes
<?php
$shapes=array('Soda Can' => 'Cylinder',
'Note Pad' => 'Rectangle',
'Apple' => 'Sphere',
'Orange' => 'Sphere',
'Phonebook' => 'Rectangle');
?>
Example 06-03 Displaying one value from an array
<?php
$shapes=array('Soda Can' => 'Cylinder',
'Note Pad' => 'Rectangle',
'Apple' => 'Sphere',
'Orange' => 'Sphere',
'Phonebook' => 'Rectangle');
print "A note pad is a {$shapes['Note Pad']}.";
?>
Example 06-04 Display the contents of an array using a loop
<?php
$shapes=array('Soda Can' => 'Cylinder',
'Note Pad' => 'Rectangle',
'Apple' => 'Sphere',
'Orange' => 'Sphere',
'Phonebook' => 'Rectangle');
foreach ($shapes as $key => $value) {
print"The $key is a $value.<br>\n";
}
?>
Example 06-05 Counting the elements in an array
<?php
$shapes=array('Soda Can' => 'Cylinder',
'Note Pad' => 'Rectangle',
'Apple' => 'Sphere',
'Orange' => 'Sphere',
'Phonebook' => 'Rectangle');
$numElements = count($shapes);
print"The array has $numElements elements.<br>\n";
?>
Example 06-06 Using sort to alphabetize
<?php
$shapes = array("rectangle", "cylinder", "sphere");
sort($shapes);
//The foreach loop selects each element from the array and assigns its value to $key
//before executing the code in the block. foreach ($shapes as $key => $val) {
echo "shapes[" . $key . "] = " . $val . "<br>";
}
?>
Example 06-07 Creating a multidimensional array
<?php
$objects=array('Soda Can' => array('Shape' => 'Cylinder',
'Color' => 'Red',
'Material' => 'Metal'),
'Note Pad' => array('Shape' => 'Rectangle',
'Color' => 'White',
'Material' => 'Paper'),
'Apple' => array('Shape' => 'Sphere',
'Color' => 'Red',
'Material' => 'Fruit'),
'Orange' => array('Shape' => 'Sphere',
'Color' => 'Orange',
'Material' => 'Fruit'),
'Phonebook' => array('Shape' => 'Rectangle',
'Color' => 'Yellow',
'Material' => 'Paper'));
echo $objects['Soda Can']['Shape'];
?>
Example 06-08 Displaying a multidimensional array
<?php
foreach ($objects as $obj_key => $obj)
{
echo "$obj_key:<br>";
while (list ($key,$value)=each ($obj))
{
echo "$key = $value ";
}
echo "<br>";
}
?>
Posted by krautgrrl on 08/07 at 10:24 AM
Chapter 6 Code • (0) Comments • (3051) Trackbacks • Permalink
Chapter 6 Code • (0) Comments • (3051) Trackbacks • Permalink
Example 06-09 Using extract on an associative array
<?php
$shapes=array('SodaCan' => 'Cylinder',
'NotePad' => 'Rectangle',
'Apple' => 'Sphere',
'Orange' => 'Sphere',
'PhoneBook' => 'Rectangle');
extract($shapes);
// $SodaCan, $NotePad, $Apple, $Orange, and $PhoneBook are now set echo $Apple;
echo "<br>";
echo $NotePad;
?>
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