I have the following code:
1. $customer = new Customer($apiContext);
2. $customer->setVat('XYZ0123456')
3. ->setName('Filipe')
4. ->setLanguageId(1);
5. (...)
The following error occurs on line 3:
Call to a member function setName () on a non-object
Can not call methods of the same cascading class as shown above?
In order for you to create method chaining , your methods need to return $this , ie
class Customer {
function setVat() {
echo "bubu!";
return $this;
}
function setName() {
echo "Bubu2!";
return $this;
}
}
And then you can:
$Customer = new Customer;
$Customer->setVat()->setName();
To execute the code in this way ( Method Chaining ), your Customer class must implement a pattern called Fluent Interface en .
In order to do this in PHP it is necessary that the methods of its class to be chained return the instance of itself ( $this ).
Your class will look something like this:
<?php
class Customer {
public function setVat($vat){
// ....
return $this;
}
public function setName($name){
// ...
return $this;
}
public function setLanguageId($languageId){
// ...
return $this;
}
// ...
}
Another way to do this with PHP is to use the __call() magic method in conjunction with private setters.
<?php
class Customer {
private function setVat($vat){
// ....
}
private function setName($name){
// ...
}
public function __call($name, $arguments){
if (method_exists($this, $name) && strpos($name, 'set') === 0)
{
$this->$name($arguments[0]); // Tratar o número de argumentos passados é
// uma boa ideia
//$this->$name(...$arguments); // A partir do PHP 5.6
return $this;
}
else
{
throw new Exception('Invalid setter method');
}
}
// ...
}
The public class methods would be accessed perfectly, only the setters that are private and not exposed outside the classes that would enter __call() . Forcing all setters to pass __call() we do not need to set the $this return on all methods.
strpos($name, 'set') === 0 protects private methods in our class that do not start with set , thus preventing undue access of private methods of the class.