PHP call method from class in other class - php

Question

Code example:
<?php // class_database.php
class database
{
include("class_validation.php"); //this does not work
$val = new validation() //this does not work
public function login($value)
{
if($val->validate($value))
{
//do something
}
}
}
<?php // class_validation.php
class validation
{
public function validate($value)
{
if($value > 50) return true;
return false;
}
}
How do I delegate the class validation in class database?
I do not wish to inherit (implement or extends) the class validation -> behavior in validation is not to be changed.
I just want to use the methods from validation class. Any OOP solutions?
Thanks in advance

Answer 1

You cant use include inside a class like that! Either include it at the beginning of the file ( my suggestion ) or use it one line before $val = new validation(); call.
class_database.php:
<?php
include("class_validation.php");
class database
{
public function login($value)
{
$val = new validation();
if($val->validate($value))
{
//do something
}
}
}
?>
 
class_validation.php:
<?php
class validation
{
public function validate($value)
{
if($value > 50)
return true;
return false;
}
}
?>

Answer 2

You need to move the include outside the class. PHP does not allow classes within classes.
Try something like this :
Code example:
<?php
include("class_validation.php"); // include outside the class declaration
// class_database.php
class database
{
$val = new validation()
public function login($value)
{
if($val->validate($value))
{
//do something
}
}
}

Answer 3

You can either put the include() outside your class (at the top of your page, class_database.php), or if your using a framework/autoloader you can call it by namespace:
Option 1
<?php
include('class_validation.php');
class database {
}
Option 2
namespace ThisCoolThing;
use \OtherCoolThing\validation;
class database { ... }