<?php
/*
Singleton && Registry Design Pattern Implementation
*/
class Registry {
private $_store = array();
public function getInstance() {
static $instance = array();
if (!$instance) {
$instance[0] = new Registry;
}
return $instance[0];
}
public function &get($key){
if($this->isValid($key)){
return $this->_store[$key];
}
}
public function set($key, $object){
$this->_store[$key] = &$object;
}
public function isValid($key){
return array_key_exists($key,$this->_store);
}
}
?>
Test Case:
<?php
require_once 'simpletest/unit_tester.php';
require_once 'simpletest/reporter.php';
require_once 'Registry.php';
class RegistryTestCase extends UnitTestCase{
function testRegistryIsSingleton(){
$this->assertIsA($reg = Registry::getInstance(), 'Registry');
$this->assertReference($reg, Registry::getInstance());
}
function testEmptyRegistryKeyIsReturnNull(){
$reg = Registry::getInstance();
$this->assertNull($reg->get('key'));
}
function testEmptyRegistryKeyIsInvalid(){
$reg = Registry::getInstance();
$this->assertFalse($reg->get('key'));
}
function testSetRegistryKeyBecomesValid(){
$reg = Registry::getInstance();
$test_value = 'something';
settype($test_value, 'Object');
$reg->set('key', $test_value);
$this->assertTrue($reg->isValid('key'));
}
function testRegistryValueIsReference(){
$reg = Registry::getInstance();
$test_value = 'something';
$reg->set('key', $test_value);
PHP程序员应该都知道连接MySQL数据库可以使用mysql_pconnect（永久连接）函数，使用数据库永久连接可以提高效率，但是实际应用中数据库永久连接往往会导致出现一些问题，通常的表现就是在大访问量的网站上时常发生断断续续的无法连接数据库的情况，出现类似＂Too many connections in ...＂的错误提示信息，重新启动服务器� ......
<html>
<head>
<title>计算本周开始结束日期</title>
</head>
<body>
<form method="post" action="./index.html" enctype="utf-8">
<table>
<tr><td>输入年份</td><td><input name="year" type="text" maxlength="4" /></td> ......
