Simple implementation of PHP object interface

This paper introduces a simple implementation method of PHP object interface. The details are as follows:

Object interface

Using interface, you can specify which methods a class must implement, but you don’t need to define the specific contents of these methods.

The interface is defined by the interface keyword, just like a standard class, but all the methods defined in it are empty.

All methods defined in an interface must be public, which is a feature of the interface.

Implementation

To implement an interface, use the implements operator. Class must implement all the methods defined in the interface, otherwise a fatal error will be reported. Class can implement multiple interfaces, with a comma to separate the names of multiple interfaces.

Note:

When implementing multiple interfaces, methods in an interface cannot have duplicate names.

Note:

Interfaces can also be inherited by using the extensions operator.

Note:

To implement an interface, a class must use exactly the same way as the method defined in the interface. Otherwise, it will lead to fatal error.

Examples

<?php

//Declare an 'ITemplate' interface
interface iTemplate
{
  public function setVariable($name, $var);
  public function getHtml($template);
}

//Implementation interface
//The following is correct
class Template implements iTemplate
{
  private $vars = array();
 
  public function setVariable($name, $var)
  {
    $this->vars[$name] = $var;
  }
 
  public function getHtml($template)
  {
    foreach($this->vars as $name => $value) {
      $template = str_replace('{' . $name . '}', $value, $template);
    }
 
    return $template;
  }
}

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