php实现事件监听与触发实例程序

class Event
{
    protected static $listens       = array();
     
    public static function listen($event, $callback, $once=false){
        if(!is_callable($callback)) return false;
        self::$listens[$event][]    = array('callback'=>$callback, 'once'=>$once);
        return true;
    }
     
    public static function one($event, $callback){
        return self::listen($event, $callback, true);
    }
     
    public static function remove($event, $index=null){
        if(is_null($index))
            unset(self::$listens[$event]);
        else
            unset(self::$listens[$event][$index]);
    }
     
    public static function trigger(){
        if(!func_num_args()) return;
        $args                       = func_get_args();
        $event                      = array_shift($args);
        if(!isset(self::$listens[$event])) return false;
        foreach((array) self::$listens[$event] as $index=>$listen){
            $callback               = $listen['callback'];
            $listen['once'] && self::remove($event, $index);
            call_user_func_array($callback, $args);
        }
    }
}

// 增加监听walk事件
Event::listen('walk', function(){
    echo "I am walking...n";
});
// 增加监听walk一次性事件
Event::listen('walk', function(){
    echo "I am listening...n";
}, true);
// 触发walk事件
Event::trigger('walk');
/*
I am walking...
I am listening...
*/
Event::trigger('walk');
/*
I am walking...
*/
 
Event::one('say', function($name=''){
    echo "I am {$name}n";
});
 
Event::trigger('say', 'deeka'); // 输出 I am deeka
Event::trigger('say', 'deeka'); // not run
 
class Foo
{
    public function bar(){
        echo "Foo::bar() is calledn";
    }
     
    public function test(){
        echo "Foo::foo() is called, agrs:".json_encode(func_get_args())."n";
    }
}
 
$foo    = new Foo;
 
Event::listen('bar', array($foo, 'bar'));
Event::trigger('bar');
 
Event::listen('test', array($foo, 'test'));
Event::trigger('test', 1, 2, 3);
 
class Bar
{
    public static function foo(){
        echo "Bar::foo() is calledn";
    }
}
 
Event::listen('bar1', array('Bar', 'foo'));
Event::trigger('bar1');
 
Event::listen('bar2', 'Bar::foo');
Event::trigger('bar2');
 
function bar(){
    echo "bar() is calledn";
}
 
Event::listen('bar3', 'bar');
Event::trigger('bar3');

<?php
//填充图表的参数
$ChartDiameter = 60; //图表直径
$ChartData = array(30,70);//用于生成图表的数据，可通过数据库来取得来确定也可以多个不过和颜色数组对应
//把角度转换为弧度
function radians($degrees){return($degrees*(pi()/180.0));}
//取得在圆心为（0，0）圆上 x,y点的值
function circle_point($degrees,$diameter){$x=cos(radians($degrees))*($diameter/2);$y=sin(radians($degrees))*($diameter/2);return (array($x,$y));}
//确定图形的大小
$ChartWidth = $ChartDiameter + 20;
$ChartHeight = $ChartDiameter + 20;
//确定统计的总数
$ChartTotal = “”;
for($index = 0;$index < count($ChartData);$index++){
$ChartTotal += $ChartData[$index];
}
$ChartCenterX = $ChartDiameter/2 + 10;
$ChartCenterY = $ChartDiameter/2 + 10;
//生成空白图形
$image = imagecreate($ChartWidth, $ChartHeight);
//分配颜色
$colorBody = imagecolorallocate($image, 0xFF, 0xFF, 0xFF);
$colorBorder = imagecolorallocate($image, 0×00, 0×00, 0×00);
$colorText = imagecolorallocate($image, 0×00, 0×00, 0×00);
$colorSlice[] = imagecolorallocate($image, 0xFF, 0×00, 0×00);//这里是和你上面写的数组对应的颜色
$colorSlice[] = imagecolorallocate($image, 0×00, 0xFF, 0×00);
//填充背境
imagefill($image, 0, 0, $colorBody);
//画每一个扇形
$Degrees = 0;
for($index = 0; $index < count($ChartData); $index++){
$StartDegrees = round($Degrees);
$Degrees += (($ChartData[$index]/$ChartTotal)*360);
$EndDegrees = round($Degrees);
$CurrentColor = $colorSlice[$index%(count($colorSlice))];
//画图F
imagearc($image,$ChartCenterX,$ChartCenterY,$ChartDiameter,$ChartDiameter,$StartDegrees,$EndDegrees, $CurrentColor);
//画直线
list($ArcX, $ArcY) = circle_point($StartDegrees, $ChartDiameter);
imageline($image,$ChartCenterX,$ChartCenterY,floor($ChartCenterX + $ArcX),
floor($ChartCenterY + $ArcY),$CurrentColor);
//画直线
list($ArcX, $ArcY) = circle_point($EndDegrees, $ChartDiameter);
imageline($image,$ChartCenterX,$ChartCenterY,ceil($ChartCenterX + $ArcX),
ceil($ChartCenterY + $ArcY),$CurrentColor);
//填充扇形
$MidPoint = round((($EndDegrees – $StartDegrees)/2) + $StartDegrees);
list($ArcX, $ArcY) = circle_point($MidPoint, $ChartDiameter/2);
imagefilltoborder($image,floor($ChartCenterX + $ArcX),floor($ChartCenterY + $ArcY),
$CurrentColor,$CurrentColor);
}
//到此脚本 已经生了一幅图像的，现在需要的是把它发到浏览器上，重要的一点是要将标头发给浏览器，让它知道是一个GIF文件。不然的话你只能看到一堆奇怪的乱码
header(“Content-type: image/png”);
imagegif($image);
?>

kill -INT `cat /usr/local/php/var/run/php-fpm.pid`

kill -USR2 `cat /usr/local/php/var/run/php-fpm.pid`

ps aux | grep -c php-fpm

killall php-fpm

/usr/local/php/sbin/php-fpm &

wget http://memcached.googlecode.com/files/memcached-1.4.15.tar.gz
tar -zxvf memcached-1.4.15.tar.gz
cd memcached-1.4.15.tar.gz
./configure
Make && make install