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Introduction to the syntax of PHP5 interface and PHP5 abstract class_PHP tutorial
Introduction to the syntax of PHP5 interface and PHP5 abstract class_PHP tutorial
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>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>The introduction of abstract classes and PHP5 interfaces makes PHP a completely object-oriented language
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