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PHP - Ways To Get Parent Class' Variables
What would be the simplest way? Do you use a method in the child class?
Personally I use Code: [Select] parent::$this->whatever; But I was wondering what you guys do. Similar TutorialsOk. 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 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, 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 a user class that is very dependent on the database class, which is why the user class extends the database. I tried creating a protected method in the parent class called getDBCObject, which returned the database object/variable/handle that I want the user to have access to. I tried the method below, but it doesn't work: <?php /* * @DATABASE * ~~~~~~~~~~~~ * @FILE DESCRIPTION: Handles all database related processes * @LAST MODIFIED: April 4, 2012 */ class database { protected $dbc; function __construct($db_host, $db_name, $db_user, $db_password) { try { $this->dbc = new PDO("mysql:host=$db_host;dbname=$db_name", $db_user, $db_password); } catch(PDOException $e) { echo '<b>An error occured while trying to create a database connection: </b>'. $e->getMessage(); } } /* * @METHOD getDBCObject * @DESC Gives the $dbc object/variable to its child classes */ protected function getDBCObject() { return $this->dbc; } } ?> My user class: <?php /* * @DATABASE * ~~~~~~~~~~~~ * @FILE DESCRIPTION: User related proccess * @LAST MODIFIED: April 5, 2012 */ class user extends database { protected $dbc; public function __construct() { if(parent::getDBCObject() == null) { echo '<br/>A database class/connection is required before creating the user class.'; } } public function isLoggedIn() { if($_COOKIE['user']) { //soon to come } else { return false; } } } ?> Any feedback on how I can let the user class use the $dbc variable in the database class? Hey ive been wanting to know how to make a function call another function which will then create a variable which i can send back to first function where i can use it. I tried somthing like this Code: [Select] <?php a(); function a($wall) { b(); echo $wall; } function b() { $wall = "test"; #a($wall); } ?> Thats what i tried but ofcourse didnt work, how would i go about doing this? Thanks. I have these two classes: Code: [Select] <?php class A { private $id; public function __construct() { $this->id = '11111'; } public function getProperty($prop) { return $this->$prop; } }?> Code: [Select] <?php class B extends A { private $message = "Nope, can't see it"; public function __construct() { parent::__construct(); $this->message = "Yep, I can see it"; } }?> I tried this, but it just outputs the id (the first call) Code: [Select] $class = new B; echo $class->getProperty('id'); echo $class->getProperty('message'); Why is that? I thought I could use a parent method on a child property.. *EDIT* Using a public or protected visibility on the message property gets me the output I expect...how come? I am getting the following error: Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /Library/WebServer/Dev/classtest/lib/class_userdata.php on line 5 on this class code: Code: [Select] class userdata { public $name = ""; public $city = ""; public $phone = ""; function setData($n, $c, $p) { $name = $n; $city = $c; $phone = $p; } function getData() { $userdata=array('name'=>$name, 'city'=>$city, 'phone'=>$phone); return $userdata; } } I thought that was a proper way to set up some class variables. (http://www.victorchen.info/accessing-php-class-variables-and-functions/). Thanks. I think I need to use $this, but I need to be able to add the two values returned from both of my functions. How would I do that? Code: [Select] public function get_users_edge($uid) { $users_primary->get_users_primary_edge($uid); $users_dynamic->get_users_dynamic_edge($uid); echo $users_primary + $users_dynamic; } Does anyone know if it's possible to call a class with an arbitrary number of variables? I'll explain what I mean. Here is my class construct definition: Code: [Select] function __construct($file, $outFile = 'newpdf.pdf', $fontSize = 70, $alpha=0.6, $overlayMsg = 'N O T F O R S H O P', $degrees = 45) { I know that I have to pass over the $file variable for it to work now. But can I create the class passing just the $file var and the $overlayMsg var? Everything else I would want to leave as default. How would I do that? Thanks Mike I keep running into a bunch of error when I declare the page variable in my model. What syntax do I need to use throughout the class? Code: [Select] <?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); class Header_Model extends CI_Model{ var $page = substr(end(explode(DIRECTORY_SEPARATOR, $_SERVER['PHP_SELF'])), 0, -4); function get_page_name() { $this->load->library('common'); $page_names = $this->common->page_names(); $title = (array_key_exists($page, $page_names) !== false) ? $page_names[$page]: ''; if (array_key_exists($page, $page_names) !== false) { $title .= " | Jason Biondo"; } return $title; } function get_js_page_file() { if (file_exists("./assets/js/pages/${page}.js")) { $javascript = "<script type=\"text/javascript\" src=\"./js/pages/${page}.js\"></script>"; } return $javascript; } } I'm confused as to why assigning these variables in the class causes the page not to load... var $RootFolder = '/shyid/'; var $PagePath = str_replace($this->RootFolder, '', dirname($_SERVER['PHP_SELF'])); var $PageSections = explode('/', $this->PagePath); but when i set them on the page, everything works correctly? $head->RootFolder = '/shyid/'; $head->PagePath = str_replace($head->RootFolder, '', dirname($_SERVER['PHP_SELF'])); $head->PageSections = explode('/', $head->PagePath); Insight? Thanks. I'm looking for a more efficient way of declaring variables within a class. What I normally use is a class which is actually a database object. Every time I make a new table in my database I make a new class and new attributes to match the fields in the db table. Looks something like this: Code: [Select] protected static $table_name="myTable"; protected static $db_fields=array('id', 'name', 'address', 'tel_number', 'fax_number'); public $name; public $address; public $tel_number; public $fax_number; //etc. etc. At the moment I am manually adding the attribute, everytime I add a field to the db table. I'm guessing there should be a way to loop through the $db_fields array and add an attribute in the loop? Can anyone help me with the syntax for this. Is there also a way that I don't have to list the fields everytime in $db_fields....can $db_fields not just look at the relevant db table and pull out the field names in some kind of clever method? All my code is returning is the username... Please help.
index.php
<?php
include('user.class');
$user = new user("Jbonnett", "0", "Admin", "Jamie", "Bonnett", "jbonnett@site.co.uk", "01/09/1992");
echo "username: " . $user->getUsername() . "<br/>";
echo "id: " . $user->getId() . "<br/>";
echo "level: " . $user->getLevel() . "<br/>";
echo "Forename: " . $user->getForename() . "<br/>";
echo "Surname: " . $user->getSurname() . "<br/>";
echo "Email: " . $user->getEmail() . "<br/>";
echo "Dob: " . $user->getDob() . "<br/>";
?>
user.class
<?php
class user {
private $username;
private $id;
private $level;
private $forename;
private $surname;
private $email;
private $dob;
public function user($username, $id, $level, $forname, $surname, $email, $dob) {
$this->setUsername($username);
$this->setId($id);
$this->setLevel($level);
$this->setForename($forename);
$this->setSurname($surname);
$this->setEmail($email);
$this->setDob($dob);
}
public function destroy() {
unset($this->username);
unset($this->id);
unset($this->level);
unset($this->forename);
unset($this->surname);
unset($this->uemail);
unset($this->dob);
}
public function setUsername($username) {
$this->username = $username;
}
public function getUsername() {
return $this->username;
}
public function setId($id) {
$this->id = $id;
}
public function getId() {
return $this->$id;
}
public function setLevel($level) {
$this->level = $level;
}
public function getLevel() {
return $this->level;
}
public function setForename($forename) {
$this->foreName = $forename;
}
public function getForename() {
return $this->forename;
}
public function setSurname($surname) {
$this->surName = $surname;
}
public function getSurname() {
return $this->surname;
}
public function setEmail($email) {
$this->email = $email;
}
public function getEmail() {
return $this->email;
}
public function setDob($dob) {
$this->dob = $dob;
}
public function getDob() {
return $this->dob;
}
};
?>
Hello there
After a few years of spending less and less time coding, I've got a lot of catching up to do. Back when I left I usually would run without classes. Now this is a big deal for me today.
I do understand the concept of classes and already did some working models, mostly from my learning process.
Now here is what is bothering me:
<?PHP
class database {
// Variables
public $test;
// Constructor
public function __construct()
{
$test = "4";
}
// Functions
//
public function test()
{
var_dump($this->test);
}
}
$test = new database;
$test->test();
?>
Wether I run this script on itself, nor through another file, this does work.
What i get is:
NULL
The constructor does run, I did an echo inside it. Also it does not matter if the variable is public, private or protected - it will be always NULL.
Error_reporting is on E_ALL, does not show any errors.
What have I overlooked?
Hi guys, I am trying something fairly simple but I'm not sure if this would be a good practice. Basically I am using a big class called CommonLibrary that holds common functions as methods and common variables as static variables. But I have some variables here and there like $allAlphabet = range ('a' , 'z'), that cannot be declared as a property because it gives me a parse error. I don't want to call an object for this class because instancing it is of no use. Values will never change with regards to instances. So the next best thing that I tried was declaring all static variables first, and then changing thei property values inside the class __construct with self::$variable = 'somevalue', and then using this code below to assign values to the empty static variables. $dummyObject = new CommonLibrary; unset($dummyObject); echo CommonLibrary::$staticVariable; // This property is NULL before the constructer is triggered. Anyone recommend any better ways of doing this? Thanks in advance! Hello,
I've noticed that there are services that I can pay to have my code
checked for possibly unsafe / insecure code.
But I'd rather audit the code myself, as my code is not meant to make money.
Is there a list of safe ways to use PHP?
Also is there any automatic way to do this that is free?
For instance is there a code checker?
I've noticed there are a number of ways to do PHP wrongly
that can be easy to overlook. Is there a list of common PHP pitfalls?
Thanks.
I would realy like to study php, other than taking other codes and editing them i havnt got a clue. Is there a shorter way to achieve this in a single foreach()? foreach ($_SESSION['cart']['content']['sizes'] as $content); foreach ($_SESSION['cart']['content']['sizem'] as $content); foreach ($_SESSION['cart']['content']['sizel'] as $content); I am thinking something like: foreach ($_SESSION['cart']['content']['sizes'] && $_SESSION['cart']['content']['sizem'] && $_SESSION['cart']['content']['sizel'] as $content); or foreach ($_SESSION['cart']['content'] = ['sizes'] || ['sizem'] || ['sizel'] as $content); Hi all If there a better way of setting variables within classes than taking it through the __construct and setting via $this ?? e.g. class SectionsConnect { protected $var; public function __construct($var){ $this->var= $var; } } Can you not set the variable automatically as it comes in through the __construct? Thanks Magnetica Hello, mates! I am new to PHP. I want to store some data shared between requests. I know that it is possible with memcached and shared memory in Unix. What ways to do it could you advice? How could I realize background service in PHP? Thank you.
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