策略模式

Author: haobinaa

docs/design_mode/Strategy.php

@@ -0,0 +1,71 @@
+<?php
+/**
+ * Created by PhpStorm.
+ * User: haobin
+ * Date: 2017/10/9
+ * Time: 23:23
+ */
+
+/**
+ *
+ * 策略模式
+ */
+interface IStrategy{
+    function filter($record);
+}
+
+class FindAfterStrategy implements IStrategy{
+    private $_name;
+
+    public function __construct($name)
+    {
+        $this->_name = $name;
+    }
+
+    public function filter($record)
+    {
+        return strcmp($this->_name, $record) <= 0;
+    }
+}
+
+class RandomStrategy implements IStrategy{
+    public function filter($record)
+    {
+        return rand(0, 1) < 0.5;
+    }
+}
+
+class UserList{
+    private $_list = array();
+
+    public function __construct($names)
+    {
+        if($names != null){
+            foreach($names as $name){
+                $this->_list [] = $name;
+            }
+        }
+    }
+
+    public function add($name)
+    {
+        $this->_list [] = $name;
+    }
+
+    public function find($filter)
+    {
+        $recs = array();
+        foreach($this->_list as $user){
+            if($filter->filter($user))
+                $recs [] = $user;
+        }
+        return $recs;
+    }
+}
+
+$ul = new UserList(array("Andy", "Jack", "Lori", "Megan"));
+$f1 = $ul->find(new FindAfterStrategy("J"));
+print_r($f1);
+
+$f2 = $ul->find(new RandomStrategy());
+print_r($f2);