随缘

<?php
class MyCacheDB extends PDO {
	private $_cache = array("cacheDir" => "cache", "cacheExpire" => 7200);
 
	// 缓存读取
	public function cquery($sql) {
		if ($this->_cache['cacheDir'] == null
			|| !is_dir($this->_cache['cacheDir']))
			exit('缓存目录不存在');
		else {
			$this->_cache['cacheDir'] = str_replace("\\", "/", $this->_cache['cacheDir']);
			$fileName = trim($this->_cache['cacheDir'], "/").'/'.urlencode(trim($sql)).'.sql';
		}
 
		// 判断缓存
		if (!file_exists($fileName) 
			|| time() - filemtime($fileName) > $this->_cache['cacheExpire']) {
			if ($tmpRS = parent::query($sql)) {
				$data = serialize($tmpRS->fetchAll());
				$this->createFile($fileName, $data);
			}
			else {
				exit('SQL错误');
			}
		}
		return $this->readCache($fileName);
	}
 
	// 读取缓存文件
	private function readCache($fileName) {
		if (is_file($fileName) && $data = file_get_contents($fileName)) {
			return new CachedStatement(unserialize($data));
		}
		return false;
	}
 
	// 生成文件
	private function createFile($fileName, $data = '') {
		if (file_put_contents($fileName, $data))
			return true;
		return false;
	}
 
	public function __set($k, $v) {
		if (array_key_exists($k, $this->_cache))
			$this->_cache[$k] = $v;
		else
			throw new Exception('属性不存在');
	}
 
	public function __get($k) {
		return isset($this->_cache[$k]) ? $this->_cache[$k] : null;
	}
}
 
 
// 缓存
class CachedStatement {
	private $_record = array();
	private $_cursorId = 0;
	private $_recordCnt = 0;
 
	public function __construct($record) {
		$this->_record = $record;
		$this->_recordCnt = count($record);
	}
 
	public function fetch() {
		if ($this->cursorId == $this->_recordCnt)
			return false;
		else if ($this->_cursorId == 0) {
			$this->_cursorId++;
			return current($this->_record);
		}
		else {
			$this->_cursorId++;
			return next($this->_record);
		}
	}
 
	public function fetchAll() {
		return $this->_record;
	}
 
	public function fetchColumn() {
		$tmp = current($this->_record);
		return $tmp[0];
	}
}
 
 
header('content-type:text/html; charset=utf-8');
 
$db = new MyCacheDB('mysql:host=localhost;dbname=test','root','xxx', array(PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES 'utf8'")); 
 
$db->cacheDir = "cache"; //设置缓存目录
$db->cacheExpire = 7200; //设置缓存时间
 
$rs = $db->cquery("select * from news limit 0,10"); //用缓存查询方法cquery代替query
while ($row = $rs->fetch()) {
 echo $row["title"] . "<br />";
}
 
$rs = null;
$db = null;
 
?>

<?php
class Test {
	public function __call($fun, $args) {
		if (method_exists($this, $fun.count($args))) {
			return call_user_func_array(array(&$this, $fun.count($args)), $args);
		}
		else {
			throw new Exception('调用了未知方法:'.get_class($this).'->'.$fun);
		}
	}
 
    //一个参数的方法
	public function foo1($a) {
			echo "你在调用一个参数的方法，参数为：".$a;
	}
    //两个参数的方法
	public function foo2($a, $b) {
			echo "你在调用两个参数的方法，参数为：".$a."和".$b;
	}
}
 
$test = new Test();
$test->foo("a");
$test->foo("a", "b");
$test->foo("a", "b", "c");
?>

<?php
class Test {
	private $_vars = array();
 
	public function __set($k, $v) {
		$this->_vars[$k] = $this->validate($v);
	}
 
	public function __get($k) {
		return isset($this->_vars[$k]) ? $this->_vars[$k] : null;	
	}
 
	private function validate($v) {
		return htmlspecialchars(addslashes($v));
	}
}
 
$test = new Test();
$test->foo = "哈哈";
$test->bar = "嘿嘿";
echo $test->foo;
echo $test->bar;
?>

function check_html($html) {
preg_match_all("/<([a-zA-Z0-9]+)\\s*[^\\/>]*>/",$html,$start_tags);
preg_match_all("/<\\/([a-zA-Z0-9]+)>/", $html, $end_tags);
if(count($start_tags[1]) != count($end_tags[1])) return false;
for($i = 0; $i < count($start_tags[1]); $i++) {
if(!in_array($start_tags[1][$i], $end_tags[1])) return false;
}
return true;
}

function check_email($email) {
if(preg_match("/^[\w\d!#$%&'*+-\/=?^`{|}~]+(\.[\w\d!#$%&'*+-\/=?^`{|}~]+)*@([a-z\d][-a-z\
d]*[a-z\d]\.)+[a-z][-a-z\d]*[a-z]$/", $eamil)) return true;
return false;
}

function is_good_pw($pw) {
if(preg_match('/(?=.*[0-9])(?=.*[a-z])(?=.*[A-Z]).{8,16}/', $pw)) {
return true;
}
return false;
}

function get_links($link) {
$html = file_get_contents($link);
$html = str_replace("\n", "", $html);
$html = preg_replace('/<a/i', "\n<a", $html);
$html = preg_replace('/<\/a>/', "</a>\n", $html);
preg_match_all('/<a\s*.*>.*?<\/a>/', $html, $matches);
return($matches);
}