|
PHP - Creating Class
Write a class for feeding a horse. The Horse object should keep track of the last time it was fed and calculate when it is hungry. Assume there is another class that checks the horse every 10 minutes to see if it is hungry and if it is, it calls another method which feeds it. There should be about 3 methods on the class, but more can be added if needed.
Similar TutorialsI would to create my own php class for my website but i dunno the fundamentals of PHP CLASSES. Can anyone teach me how to create and use php class. best if you go into deeper explanations. My main subject is to create a social net site I am trying to class type inheritance with Doctrine. Eventually, I will be defining things using XML, but all the examples are done using doctags. I found the following and it seems to work.
<?php
use Doctrine\ORM\Mapping as ORM;
/**
* Inventory entity
*
* @ORM\Entity(repositoryClass="Inventory")
* @ORM\Table(name="inventory")
* @ORM\InheritanceType("JOINED")
* @ORM\DiscriminatorColumn(name="discriminator_column", type="string")
* @ORM\DiscriminatorMap({"inventory" = "AbstractItem", "inventory_room" = "Room"})
*/
abstract class AbstractItem
{
/**
* @ORM\Id @ORM\Column(name="inventory_id") @ORM\GeneratedValue
* @var int
*/
protected $inventory_id;
/**
* @ORM\Column(type="string")
* @var string
*/
protected $category;
/**
* @ORM\Column(type="string")
* @var string
*/
protected $part_number;
}
use Doctrine\ORM\Mapping as ORM;
/**
* Inventory Room entity
* @ORM\Entity
* @ORM\Table(name="inventory_room")
*/
class Room extends AbstractItem
{
/**
* @ORM\Column(type="string")
* @var string
*/
protected $room_type;
/**
* @ORM\Column(type="string")
* @var string
*/
protected $rack_limit;
But then I convert it to XML or YAML, and I get a Entity class 'Room' used in the discriminator map of class 'AbstractItem' does not exist error when trying to build the classes. I've also tried changing the type to mappedSuperclass, but no success. Any ideas? Also, what is the purpose of the DiscriminatorColumn? Thanks
AbstractItem: type: entity table: inventory inheritanceType: JOINED discriminatorColumn: name: discriminator_column type: string discriminatorMap: inventory: AbstractItem inventory_room: Room repositoryClass: Inventory id: inventory_id: type: string fields: category: type: string part_number: type: string Room: type: entity table: inventory_room fields: room_type: type: string rack_limit: type: string
<?xml version="1.0" encoding="utf-8"?> <doctrine-mapping xmlns="http://doctrine-project.org/schemas/orm/doctrine-mapping" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://doctrine-project.org/schemas/orm/doctrine-mapping https://www.doctrine-project.org/schemas/orm/doctrine-mapping.xsd"> <entity repository-class="Inventory" name="AbstractItem" table="inventory" inheritance-type="JOINED"> <discriminator-column name="discriminator_column" type="string" length="255"/> <discriminator-map> <discriminator-mapping value="inventory" class="AbstractItem"/> <discriminator-mapping value="inventory_room" class="Room"/> </discriminator-map> <id name="inventory_id" type="string" column="inventory_id"> <generator strategy="IDENTITY"/> </id> <field name="category" type="string" column="category" precision="0" scale="0" nullable="false"/> <field name="part_number" type="string" column="part_number" precision="0" scale="0" nullable="false"/> </entity> </doctrine-mapping> <?xml version="1.0" encoding="utf-8"?> <doctrine-mapping xmlns="http://doctrine-project.org/schemas/orm/doctrine-mapping" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://doctrine-project.org/schemas/orm/doctrine-mapping https://www.doctrine-project.org/schemas/orm/doctrine-mapping.xsd"> <entity name="Room" table="inventory_room"> <id name="inventory_id" type="string" column="inventory_id"> <generator strategy="IDENTITY"/> </id> <field name="room_type" type="string" column="room_type" precision="0" scale="0" nullable="false"/> <field name="rack_limit" type="string" column="rack_limit" precision="0" scale="0" nullable="false"/> <field name="category" type="string" column="category" precision="0" scale="0" nullable="false"/> <field name="part_number" type="string" column="part_number" precision="0" scale="0" nullable="false"/> </entity> </doctrine-mapping>
Hi there, I am just wondering which way is the correct one if you want to create object properties/attribute dynamically at run time using magic method __set(), __get(), for example: class Foo{ public $data = array(); public function __set($name,$value){ $this->data[$name] = $value; } public function __get($name){ if ( isset($this->data[$name]) ){ return $this->data[$name]; } } } Or using the below way class Foo{ public function assign(array $data){ foreach($data as $key => $value){ $this->$key = $value; } } } I just encountered the second way in many places and I am totally confused . Is the __set() method called implicitly by the PHP engine in the second way or what? how come this is considered as a valid code ? your usual help is appreciated I have mysqli object in Database class base: [color=]database class:[/color] class Database { private $dbLink = null; public function __construct() { if (is_null($this->dbLink)) { // load db information to connect $init_array = parse_ini_file("../init.ini.inc", true); $this->dbLink = new mysqli($init_array['database']['host'], $init_array['database']['usr'], $init_array['database']['pwd'], $init_array['database']['db']); if (mysqli_connect_errno()) { $this->dbLink = null; } } } public function __destruct() { $this->dbLink->close(); } } Class derived is Articles where I use object dBLink in base (or parent) class and I can't access to mysqli methods (dbLink member of base class): Articles class: require_once ('./includes/db.inc'); class Articles extends Database{ private $id, .... .... $visible = null; public function __construct() { // Set date as 2009-07-08 07:35:00 $this->lastUpdDate = date('Y-m-d H:i:s'); $this->creationDate = date('Y-m-d H:i:s'); } // Setter .... .... // Getter .... .... public function getArticlesByPosition($numArticles) { if ($result = $this->dbLink->query('SELECT * FROM articles ORDER BY position LIMIT '.$numArticles)) { $i = 0; while ($ret = $result->fetch_array(MYSQLI_ASSOC)) { $arts[$i] = $ret; } $result->close(); return $arts; } } } In my front page php I use article class: include_once('./includes/articles.inc'); $articlesObj = new articles(); $articles = $articlesObj->getArticlesByPosition(1); var_dump($articles); [color=]Error that go out is follow[/color] Notice: Undefined property: Articles::$dbLink in articles.inc on line 89 Fatal error: Call to a member function query() on a non-object in articles.inc on line 89 If I remove constructor on derived class Articles result don't change Please help me If a class has a constructor but also has a static method, if I call the static method does the constructor run so that I can use an output from the constructor in my static method? --Kenoli Hi Can you call Class A's methods or properties from Class B's methods? Thanks. I have an existing instance of my class Database, now I want to call that instance in my Session class, how would I go about doing this? Ok. I know you can pass the object of a class as an argument. Example: class A { function test() { echo "This is TEST from class A"; } } class B { function __construct( $obj ) { $this->a = $obj; } function test() { $this->a->test(); } } Then you could do: $a = new A(); $b = new B($a); Ok so that's one way i know of. I also thought that you could make a method static, and do this: (assuming class A's test is 'static') class B { function test() { A::test(); } } But that is not working. I'd like to know all possible ways of accomplishing this. Any hints are appreciated. thanks Hi, I need to be able to call a class based on variables. E.G. I would normally do: Code: [Select] $action = new pattern1() but i would like to be able to do it dynamicaly: Code: [Select] $patNum = 1; $action = new pattern.$patNum.() Im wondering if that's possible? If so what would the correct syntax be? Many Thanks. I have two classes: ## Admin.php <?php class Admin { public function __construct() { include("Config.php"); } /** * deletes a client * @returns true or false */ function deleteClient($id) { return mysql_query("DELETE FROM usernames WHERE id = '$id'"); } } ?> ## Projects.php <?php class Projects { public function __construct() { include("Config.php"); $this->admin = $admin; $this->dataFolder = $dataFolder; } /** * Deletes a project * @returns true or false */ function deleteProject($id) { $root = $_SERVER['DOCUMENT_ROOT']; $theDir = $root . $this->dataFolder; $sql = mysql_query("SELECT * FROM projectData WHERE proj_id = '$id'"); while ($row = mysql_fetch_array($sql)) { $mainFile = $row['path']; $thumb = $row['thumbnail']; if ($thumb != 'null') { unlink($theDir . "/" . substr($thumb,13)); } unlink($theDir . "/" . substr($mainFile,13)); } $delete = mysql_query("DELETE FROM projectData WHERE proj_id = '$id'"); $getDir = mysql_query("SELECT proj_path FROM projects WHERE id = '$id'"); $res = mysql_fetch_array($getDir); rmdir($theDir . "/" . $res['proj_path']); return mysql_query("DELETE FROM projects WHERE id = '$id'"); } } ?> How can I call deleteProject() from within Admin.php? Hi people! class FirstOne{ public function FunctionOne($FirstInput){ //do stuff and output value return $value1; } } Then:- class SecondOne{ public function FunctionTwo($AnotherInput){ //do stuff and output value return $value2; } } What I want to know is this, if I want to use FunctionOne() in Class SecondOne do I do it like this:- (Assume as I have instantiated the first class using $Test = new FirstOne(); ) class SecondOne{ function SecondedFunction(){ global $Test; return $Test->FunctionOne(); } public function FunctionTwo($AnotherInput){ //do stuff and output value return $value2; } public function FunctionThree(){ //some code here $this->Test->SecondedFunction();<--I think as I can omit the $this-> reference } } My point is: Do I have to do it this way or is there way of having this done through __construct() that would negate the need for a third party function? I have a version working, I just think that it is a little convoluted in the way as I have done it, so I thought I would ask you guys. Any help/advice is appreciated. Cheers Rw I do know how to do this but I am curious about whether or not there is a "preferred" way to do this. I know there are a couple ways to use a class (I'll call Alpha_Class) within another class (I'll class Beta_Class) Let's say we have this simple class (Beta_Class): class beta { function foo(){ } } If I wanted to use the Alpha Class within the Beta Class, I could any number of things. For example: class beta { function foo(){ $this->alpha = new alpha; //$this->alpha->bar(); } } Or you could simply use the $GLOBALS array to store instantiated objects in: $GLOBALS['alpha'] = new alpha; class beta { function foo(){ //GLOBALS['alpha']->bar(); } } You could even declare Alpha_Class as a static class and thus would not need to be instantiated: static class alpha { static function bar(){} } class beta { function foo(){ //alpha::bar(); } } Those are the only ways I can think of right now. Are there any other ways to accomplish this? I was wondering which way is the best in terms of readability and maintainability. Hi all, I have two classes. Registration and Connection. Inside a registration.php I include my header.php, which then includes my connection.php... So all the classes should be declared when the page is loaded. This is my code: registration.php: <?php include ('assets/header.php'); ?> <?php class registration{ public $fields = array("username", "email", "password"); public $data = array(); public $table = "users"; public $dateTime = ""; public $datePos = 0; public $dateEntryName = "date"; function timeStamp(){ return($this->dateTime = date("Y-m-d H:i:s")); } function insertRow($data, $table){ foreach($this->fields as $key => $value){ mysql_query("INSERT INTO graphs ($this->fields) VALUES ('$data[$key]')"); } mysql_close($connection->connect); } function validateFields(){ $connection = new connection(); $connection->connect(); foreach($this->fields as $key => $value){ array_push($this->data, $_POST[$this->fields[$key]]); } $this->dateTime = $this->timeStamp(); array_unshift($this->data, $this->dateTime); array_unshift($this->fields, $this->dateEntryName); foreach($this->data as $value){ echo "$value"; } $this->insertRow($this->data, $this->table); } } $registration = new registration(); $registration->validateFields(); ?> <?php include ('assets/footer.php'); ?> At this point I cannot find my connection class defined on another included/included page. $connection = new connection(); $connection->connect; config.php (included within header.php) <? class connection{ public $dbname = '**'; public $dbHost = '**'; public $dbUser = '**'; public $dbPass = '**'; public $connect; function connect(){ $this->connect = mysql_connect($this->dbHost, $this->dbUser, $this->dbPass) or die ('Error connecting to mysql'); mysql_select_db($this->dbname, $this->connect); } } ?> Any ideas how to call it properly? How does one go about using one class inside another? For example, building a class that does some series of functions, and uses a db abstraction layer class in the process? I have a class in which I have a function called connection. I am now trying to call this function from another class, but it will not work. It works if I put the code in from the other function rather than calling it but that defeats the purpous. class locationbox { function location() { $databaseconnect = new databaseconnect(); $databaseconnect -> connection();{ $result = mysql_query("SELECT * FROM locations"); while($row = mysql_fetch_array($result)) // line that now gets the error, mysql_fetch_array() expects parameter 1 to be resource, boolean given //in { echo "<option>" . $row['location'] . "</option>"; } } }} Well the title may seem a bit confusing, but heres an example: Code: [Select] <?php class User{ public $uid; public $username; protected $password; protected $email; public $usergroup; public $profile; public function __construct($id){ // constructor code inside } public function getemail(){ return $this->email; } public function getusergroup(){ return $this->usergroup; } public function getprofile(){ $this->profile = new UserProfile($this->uid); } } class UserProfile(){ protected $avatar; protected $bio; protected $gender; protected $favcolor; public function __construct($id){ // constructor code inside } public function formatavatar(){ // avatar formatting code inside } public function formatusername(){ // format username? } } ?> As you can see, the User class(an outer class) has a property called Profile, which can be instantiated as a UserProfile object(an inner class). The two objects have distinct functionalities, but there are times when the UserProfile object needs to access property and methods from the user object. I know its easy for outer class to access methods from inner class by using the single arrow access operator twice, but how about the other way around? Lets say from the above example the userprofile can format the username displayed to the screen by adding a sun to the left of the username if the usergroup is admin, a moon if the usergroup is mod, and nothing if its just a member. The usergroup property is stored in the outer class, and can be accessed with this $user->getusergroup() method only. I know I can always do the hard way by passing a user object to the method's argument, but is there an easier way for the inner class UserProfile to access properties/methods for outerclass User? If so, how can I achieve that? Hello everyone, I found a tutorial on creating a pdf with php and I just tried to create a basic pdf to see if it worked and modify it from there. Here is the link to the tutorial: http://www.astahost.com/info/tfclt-create-pdf-php-create-fly-pdf-web-server.html Well, after uploading the following php file to the server and testing it, I got this error: Fatal error: Call to undefined function pdf_new() in /home/caresa6/public_html/BubblyBounce.com/admin/pdftest.php on line 2 Here's the code that produced the error: Code: [Select] <?php $mypdf = PDF_new(); PDF_open_file($mypdf, ""); PDF_begin_page($mypdf, 595, 842); $myfont = PDF_findfont($mypdf, "Times-Roman", "host", 0); PDF_setfont($mypdf, $myfont, 10); PDF_show_xy($mypdf, "Sample PDF, constructed by PHP in real-time.", 50, 750); PDF_show_xy($mypdf, "Made with the PDF libraries for PHP.", 50, 730); PDF_end_page($mypdf); PDF_close($mypdf); $mybuf = PDF_get_buffer($mypdf); $mylen = strlen($mybuf); header("Content-type: application/pdf"); header("Content-Length: $mylen"); header("Content-Disposition: inline; filename=gen01.pdf"); print $mybuf; PDF_delete($mypdf); ?> Can anyone help me figure out what to do from here? I have some PHP knowledge, but I'm treading in uncharted waters with this, so I am totally lost. Thanks in advance. i have: Code: [Select] class Host { public $hostname; public $foundResults; public function __construct($hostname) { $this->$hostname = $hostname; $foundResults = array(); } } but when i create a object the hostname doesn't get set, instand a new propert get's created What do i do wrong? Quote Host Object ( [hostname] => [foundResults] => [www.google.nl] => www.google.nl ) I need to add a class to the div at the end of my for each. How do I say if the function breaks, add in class="lastmessage" <?php $counter = 0; foreach ($conversations as $conversation) { if(++$counter == 5) break; ?> <div class="(add class here)"> <a href="blah"><?php echo blah; ?></a> </div> <?php } ?> |
|||||||