Introduction to the syntax of PHP5 interface and PHP5 abstract class

Introduction to the syntax of PHP5 interface and PHP5 abstract class_PHP tutorial

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Release： 2016-07-15 13:28:56

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Everyone’s code for the specific PHP5 abstract class is as follows:

<ol class="dp-xml">
<li class="alt"><span><span>abstract class AbstractClass {     </span></span></li>
<li class=""><span>   abstract public function test();     </span></li>
<li class="alt"><span>}     </span></li>
<li class=""><span>    </span></li>
<li class="alt"><span>class ImplementedClass extends AbstractClass {     </span></li>
<li class=""><span>   public function test() {     </span></li>
<li class="alt"><span>       echo "ImplementedClass::test() called. ";     </span></li>
<li class=""><span>   }     </span></li>
<li class="alt"><span>}     </span></li>
<li class=""><span>    </span></li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">o</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">new</font></span><span> ImplementedClass;     </span>
</li>
<li class="">
<span>$o-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>test();    </span>
</li>
</ol>

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PHP 5 also supports the concept of interfaces , and introduced the interface and implements keywords. Like Java, PHP 5 uses interfaces to achieve an effect similar to "multiple inheritance". The PHP5 interface syntax is as follows:

<ol class="dp-xml">
<li class="alt"><span><span>interface displayable {     </span></span></li>
<li class=""><span>  function display();     </span></li>
<li class="alt"><span>}     </span></li>
<li class=""><span>interface printable {     </span></li>
<li class="alt"><span>  function doprint();     </span></li>
<li class=""><span>}     </span></li>
<li class="alt"><span>    </span></li>
<li class=""><span>class foo implements displayable,printable {     </span></li>
<li class="alt"><span>  function display() {     </span></li>
<li class=""><span>    // code     </span></li>
<li class="alt"><span>  }   function doprint() {     </span></li>
<li class=""><span>    // code     </span></li>
<li class="alt"><span>  }     </span></li>
<li class=""><span>}    </span></li>
</ol>

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The introduction of abstract classes and PHP5 interfaces makes PHP a completely object-oriented language