I have a Model.class.php and a Bag.class.php, the Bag class extends the Model class.
But when i try to call a function defined in Bag.class.php, it show a fatal error " Call to undefined function fill_entity() in"
bag.class.php :
class Bag extends Model{
public function __construct($table_name){
$this->table_name = $table_name;
}
public function fill_entity($row){
$this->id = $row['bagID'];
$this->name = $row['bagName'];
$this->price = $row['bagPrice'];
$this->url = $row['bagURL'];
$this->img_url = $row['bagImgURL'];
$this->mall_id = $row['mallID'];
$this->brand_id = $row['brandID'];
}
here's my php page where i call this function :
$bag = new Bag($bagtype);
$bag.fill_entity($row); <---- error on this line.
You're using the wrong syntax. PHP doesn't use dot notation, but rather -> (arrow/pointer notation)
Try using this:
$bag->fill_entity($row);
(The . is still used in PHP, but is used for string concatenation.)
Don't feel bad about missing this, I did it plenty of times when I first tackled PHP.
In PHP, it would be $bag->fill_entity($row); rather than $bag.fill_entity($row);.
Related
I'm new to PHP and I am trying to follow a course.
<?php
class myCar {
function myCar() {
$this->model = "Sports";
}
}
$Range_Rover = new myCar();
echo $Range_Rover->model;
?>
According to the tutorial I should get the output "Sports" What is causing the code to result in an error of undefined property?
Warning: Undefined property: myCar::$model in
C:\xampp\htdocs\Test\index.php on line 16
Screenshot of tutorial results
Many thanks,
Stuart
Correct way to do it:
<?php
class myCar {
public $model;
function __construct() {
$this->model = "Sports";
}
}
$Range_Rover = new myCar();
echo $Range_Rover->model;
Output: https://3v4l.org/bnNrm
Note: Why above is needed
a) Defining constructor name as class name is an older practice, and it will give you deprecation message for some php version (php 7 versions).
b) Also from php8 it will be treated like a normal function, not as a constructor, so your purpose will not solve.
You need to declare the class variable before using it.
Just add "public $model;" before function mycar().
You should declare model like this
public $model;
Also as some answers told before, the constructor needs to be defined as __constructor now. this would look like
<?php
class myCar {
public $model;
function __constructor() {
$this->model = "Sports";
}
}
$Range_Rover = new myCar();
echo $Range_Rover->model;
?>
I have a called class called ClientPolicy which is like this
class ClientPolicy {
var $serverHost="www.example.com";
var $httpPort = 80;
var $httpsPort = 443;
var $appKey;
var $secKey;
var $defaultContentCharset = "UTF-8";
}
and another class file name SyncAPIClient which looks like this
class SyncAPIClient{
function SyncAPIClient(ClientPolicy $clientPolicy) {
$this->clientPolicy = $clientPolicy;
}
function SyncAPIClient($appKey, $appSecret) {
$this->clientPolicy = new ClientPolicy();
$this->clientPolicy->appKey=$appKey;
$this->clientPolicy->secKey=$appSecret;
}
}
My questions are
1.) If you check the function in SyncAPIClient, you will notice that the ClientPolicy class was passed as a parameter before a variable, what does it really mean? What is the essence of passing a class in function parameter?
2.) I am getting an error "Cannot redeclare SyncAPIClient::SyncAPIClient()" in my script log and the reason is that SyncAPIClient function was called twice in SyncAPIClient class. How can I solve this issue? Is there any better way to write this SyncAPIClient function instead of passing it twice?
The author of this script is nowhere to be found and I am left to fix it.
1) Here the $clientPolicy variable that is passed to this function, needs be a ClientPolicy instance.
In this way, if the argument that is passed is different from an instance of ClientPolice class, an error is generated.
function SyncAPIClient(ClientPolicy $clientPolicy) {
$this->clientPolicy = $clientPolicy;
}
https://wiki.php.net/rfc/typed_properties_v2
https://laravel-news.com/php7-typed-properties
2) The error Cannot redeclare SyncAPIClient::SyncAPIClient() is caused because you are trying to declare two functions called SyncAPIClient ().
If in first SyncAPIClient() method you just want save the $clientPolicy in $this->clientPolicy, you can use the magic method __construct. Or just try changing the name of one of the functions, and the problem should be a problem.
class SyncAPIClient{
__construct(ClientPolicy $clientPolicy) {
$this->clientPolicy = $clientPolicy;
}
function SyncAPIClient($appKey, $appSecret) {
$this->clientPolicy = new ClientPolicy();
$this->clientPolicy->appKey=$appKey;
$this->clientPolicy->secKey=$appSecret;
}
}
https://www.php.net/manual/en/language.oop5.decon.php
http://www.zentut.com/php-tutorial/php-constructor-and-destructor/
Hope this helps!
I would've fix the code you have like this:
class SyncAPIClient
{
private $clientPolicy = null;
function SyncAPIClient(ClientPolicy $clientPolicy = null)
{
if($clientPolicy instanceof ClientPolicy){
$this->clientPolicy = $clientPolicy;
}else{
$this->clientPolicy = new ClientPolicy();
}
}
public function setAuthParams($appKey, $appSecret) {
$this->clientPolicy->appKey=$appKey;
$this->clientPolicy->secKey=$appSecret;
}
}
This way you can instantiate a SyncAPIClient with or without a ClientPolicy.
Without ClientPolicy:
$syncAPI = new SyncAPIClient();
$syncAPI->setAuthParams($apiKey, $apiSecret);
With ClientPolicy:
$clientPolicy = new ClientPolicy();
$clientPolicy->appKey=$appKey;
$clientPolicy->secKey=$appSecret;
$syncAPI = new SyncAPIClient($clientPolicy);
When using class and functions in combination like
Rtin::
Functions nested inside that class Rtin should have different names than that class name
So you shouldn't have function called rtin
However you can call function from outside the class with it's name
From the error you have may be due to:
function you nested in the class or the function outside the class has a duplicate outside the script itself. Like having function mentioned in included function.php file and also mentioned in the script itself so php get confused because function name is written in two php files at the same time
Example of class
class Rtin{
private $data;
private $results;
public function getResultsType(){
return ........
}
}
To call class use
$q = Rtin::getResultsType($data['name']);
In your example. Adapt it to the example I have provide and review the included files for duplicate function .
I need to use method from Nette library, that I'm including by use command. But it doesn't work as I want to, throws fatal error, that I am calling undefined method.
How should I approach that method to make it work? Stupid question, but I am kinda new to OOP...
Method from class PresenterComponent.php
public function getPresenter($need = TRUE)
{
return $this->lookup('Nette\Application\UI\Presenter', $need);
}
And my code, where I need to use that method:
use Nette\Application\UI\PresenterComponent;
class DatabaseCollectionAdapter extends ArrayDataAdapter
{
// ..... some code......
$this->user = $this->getPresenter()->getUser();
Error:
Fatal Error
Call to undefined method Ctech\Gridator\DataAdapter\DatabaseCollectionAdapter::getPresenter()
change this
$this->user = $this->getPresenter()->getUser();
to this:
$object = new yourObject(); // yourObject extends PresenterComponent
$this->user = $object->getPresenter()->getUser();
use Nette\Application\UI\PresenterComponent; does not include or do any kind of magic to make it's functions available on the fly.
https://secure.php.net/manual/de/language.namespaces.importing.php
It's just a shorthand that helps you to use PresenterComponent directly without specifying the whole namespace.
Your DatabaseCollectionAdapter or ArrayDataAdapter has to have a function that looks like this:
class AdapterClass
public function getPresenter() {
return new Nette\Application\UI\PresenterComponent;
}
}
or something like this
use Nette\Application\UI\PresenterComponent;
class AdapterClass
public function getPresenter() {
return new PresenterComponent;
}
}
I started using classes in PHP, and I have the following code:
class webConfig
{
public $SALT1 = "3525";
public $SALT2 = "2341";
public $SALT3 = $SALT1.$SALT2;
}
But this gives me 500 Internal Server Error, which means that I am doing something wrong.
Is there any way of doing this without using any function, including construct?
This does not work aswell:
class webConfig
{
public $SALT1 = "3525";
public $SALT2 = "2341";
public $SALT3 = $this->SALT1.$this->SALT2;
}
In PHP; Expressions are not allowed as Default Values of any Property. For this reason, PHP is simply saying that you should not even imagine doing that in the first place. But, fortunately then; this is why you have the Constructor Method — to help you initialize some class Properties, assign Default values to Member Properties using Expression (like in your case), etc.... Using a Constructor, your class could look like the Snippet below and it is expected to work as well:
<?php
class webConfig {
public $SALT1 = "3525";
public $SALT2 = "2341";
public $SALT3;
public function __construct(){
// SET THE VALUE $SALT3 HERE INSTEAD
$this->SALT3 = $this->SALT1 . $this->SALT2;
}
}
Alternatively; you may even initialize all the Properties of the Class within the Constructor like so:
<?php
class webConfig {
public $SALT1; //<== NOTICE THAT THIS PROPERTY IS NOT INITIALIZED.
public $SALT2; //<== NOTICE THAT THIS PROPERTY IS NOT INITIALIZED.
public $SALT3; //<== NOTICE THAT THIS PROPERTY IS NOT INITIALIZED.
public function __construct(){
$this->SALT1 = "3525";
$this->SALT2 = "2341";
$this->SALT3 = $this->SALT1 . $this->SALT2; //<== YET AGAIN; SET THE VALUE
//<== OF $SALT3 LIKE BEFORE
}
}
I have following code
class DataMapperFactoryBeta
{
static private $configClassName = 'ConfigBeta';
static private $client;
static private $mapper = [];
static public function initClient()
{
$className = 'Models\\DataMappers\\Clients\\'.self::$configClassName::$db_type;
}
}
The Interpretor throws me a fatal error: 'incorrect access to static class member'. I wish to have the config class name accessed dynamicly, because I will change it in the future and I don't wanna change it in many places in the code, only once, through $configClassName. Is this even possible with statics?
Split your line into two, and it should work for you as you expect:
$className = 'Models\\DataMappers\\Clients\\' . self::$configClassName;
$className = $className::$db_type;
On a side note, I couldn't find in the PHP docs whether the scope resolution operator (::) is left or right associative. It could be it's trying to interpret the line as follows:
('Models\\DataMappers\\Clients\\'.self::($configClassName::$db_type));
Without an update from the docs the code is ambiguous as to what exactly should be happening the way you have it written.