Example code sharing of PHP template method pattern

Template Method Pattern:

The Template Method pattern defines the steps of an algorithm and allows subclasses to provide implementations for one or more steps. Template method pattern: Define the skeleton of an

algorithm in a method, and defer some steps to subclasses. The template method allows subclasses to Redefine certain steps in the algorithm.

##

<?php
// 模板方法模式

function echoLine($msg) {
	echo $msg, &#39;<br/>&#39;;
}

abstract class TemplateBase
{
	abstract function step1();
	abstract function step2();
	abstract function step3();
	
	public function doAction() {
		$this->step1();
		if(!$this->skipStep2()) {
			$this->step2();
		}
		$this->step3();
	}
	
	/**
	 * 钩子方法
	 */
	public function skipStep2() {
		return false;
	}
}

class ConcreteTemplate extends TemplateBase
{
	public function step1() {
		echoLine(&#39;This is step 1&#39;);
	}
	
	public function step2() {
		echoLine(&#39;This is step 2&#39;);
	}
	
	public function step3() {
		echoLine(&#39;This is step 3&#39;);
	}
	
	// 用来控制是否跳过某些步骤
	public function skipStep2() {
		return false;
	}
}

// test code
$ct = new ConcreteTemplate();
$ct->doAction();

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