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    ▪php简单的会话类代码       代码如下: <?php class session { static $sessionObject; /* $_SESSION['user'] == 0 , don't work . * == 1 , he is really user . */ private function __construct() { if(! ( isset($_SESSION['user']) && $_SESSION['user']==0 )) session_set_co.........

    ▪php中将时间差转换为字符串提示的实现代码       如微博 这看起来更加人性化，好吧，上代码 代码如下: <?php class timeAgo { static $timeagoObject; private $rustle; private $unit; private function __construct() { } private function __clone(){ } public static function getObje.........

    ▪兼容firefox，chrome的网页灰度效果       只是在技术上来看，要实现网页灰度，最稳妥的办法莫过于直接处理所有图像，不用考虑兼容，不用考虑效率。但是，工作量比较大，切换回来也费力。 ie系列支持css滤镜，一句 filter:gray; .........

代码如下:

<?php
class session
{
static $sessionObject;
/* $_SESSION['user'] == 0 , don't work .
* == 1 , he is really user .
*/
private function __construct()
{
if(! ( isset($_SESSION['user']) && $_SESSION['user']==0 ))
session_set_cookie_params(3600);

session_start(); //Initialize14 }15 private function __clone()
{
}
public static function getObject()
{
if(! self::$sessionObject instanceof self)
$sessionObject = new session() ;

return $sessionObject;
}

public function set_false()
{
$_SESSION['user'] = 0 ; // for PHP>=5
}
public function set_true()
{
if( isset($_SESSION['user']) )
$_SESSION['user'] = 1 ;
else
$this->error();
}
public function get_status()
{
return $_SESSION['user'];
}
public function end_session()
{
session_destroy();
}
public function error()
{

}
}
?>

代码如下:

$session = session::getObject();
if($session->get_status())
// .... the user is really
else
// ....

代码如下:

<?php
class timeAgo
{
static $timeagoObject;
private $rustle;
private $unit;

private function __construct()
{

}
private function __clone(){ }
public static function getObject()
{
if(! (self::$timeagoObject instanceof self) )
self::$timeagoObject = new timeAgo();

return self::$timeagoObject;
}
private function count_int($unix_C) // main function
{
if(! (isset($unix_C) || is_numeric($unix_C)) )
return 'don\'t find parameter';

$d = time()-$unix_C ; // $d - unix time difference value
$d_int =(int)floor($d/60) ; // minimum unit -- minutes unix/60

$this->unit = 0 ; // is minutes,hour or day?

if($d_int < 60){ // minutes in one hour 3600
$this->rustle = $d_int;
$this->unit = 1;
}
else if($d_int < 720){ //hour in one day 3600*12
$this->rustle = floor($d_int/60);
$this->unit = 2 ;
}
else if($d_int < 7200){ //day in ten days 3600*12*10
$this->rustle = floor($d_int/720);
$this->unit = 3 ;
}
else{
$this->rustle = $d ;
$this->unit = 4 ;
}
}
public function piece_str($C)
{
$this->count_int($C);

$u = '';
switch( $this->unit )
{
case 1:
$u = 'minute';
break;
case 2:
$u = 'hour';
break;
case 3:
$u = 'day';
break;
case 4:
$u = '';
break;
case 0:
return 'sorry , get time is fail';
}
if($this->unit < 4)
{
if($this->rustle > 1)
return (string)$this->rustle.$u.'s ago';
else if($this->rustle == 1)
return (string)$this->rustle.$u.'ago';
else
return 'Just now';
}
}
/* example: $ago = timeAgo::getObject();
* echo $ago->piece_str($unix);
* // 2 days ago
*/
}
?>