PHP memcache实现消息队列实例

<?php
/**
* Memcache 消息队列类
*/

class QMC {
const PREFIX = 'ASDFASDFFWQKE';

/**
* 初始化mc
* @staticvar string $mc
* @return Memcache
*/
static private function mc_init() {
static $mc = null;
if (is_null($mc)) {
$mc = new Memcache;
$mc->connect('127.0.0.1', 11211);
}
return $mc;
}
/**
* mc 计数器,增加计数并返回新的计数
* @param string $key   计数器
* @param int $offset   计数增量,可为负数.0为不改变计数
* @param int $time     时间
* @return int/false    失败是返回false,成功时返回更新计数器后的计数
*/
static public function set_counter( $key, $offset, $time=0 ){
$mc = self::mc_init();
$val = $mc->get($key);
if( !is_numeric($val) || $val < 0 ){
$ret = $mc->set( $key, 0, $time );
if( !$ret ) return false;
$val = 0;
}
$offset = intval( $offset );
if( $offset > 0 ){
return $mc->increment( $key, $offset );
}elseif( $offset < 0 ){
return $mc->decrement( $key, -$offset );
}
return $val;
}

/**
* 写入队列
* @param string $key
* @param mixed $value
* @return bool
*/
static public function input( $key, $value ){
$mc = self::mc_init();
$w_key = self::PREFIX.$key.'W';
$v_key = self::PREFIX.$key.self::set_counter($w_key, 1);
return $mc->set( $v_key, $value );
}
/**
* 读取队列里的数据
* @param string $key
* @param int $max  最多读取条数
* @return array
*/
static public function output( $key, $max=100 ){
$out = array();
$mc = self::mc_init();
$r_key = self::PREFIX.$key.'R';
$w_key = self::PREFIX.$key.'W';
$r_p   = self::set_counter( $r_key, 0 );//读指针
$w_p   = self::set_counter( $w_key, 0 );//写指针
if( $r_p == 0 ) $r_p = 1;
while( $w_p >= $r_p ){
if( --$max < 0 ) break;
$v_key = self::PREFIX.$key.$r_p;
$r_p = self::set_counter( $r_key, 1 );
$out[] = $mc->get( $v_key );
$mc->delete($v_key);
}
return $out;
}
}
/**
使用方法:
QMC::input($key, $value );//写入队列
$list = QMC::output($key);//读取队列
*/
?>

<?php
/**
* 使用共享内存的PHP循环内存队列实现
* 支持多进程, 支持各种数据类型的存储
* 注: 完成入队或出队操作,尽快使用unset(), 以释放临界区
*
* @author wangbinandi@gmail.com
* @created 2009-12-23
*/
class ShmQueue
{
private $maxQSize = 0; // 队列最大长度

private $front = 0; // 队头指针
private $rear = 0;  // 队尾指针

private $blockSize = 256;  // 块的大小(byte)
private $memSize = 25600;  // 最大共享内存(byte)
private $shmId = 0;

private $filePtr = './shmq.ptr';

private $semId = 0;
public function __construct()
{
$shmkey = ftok(__FILE__, 't');

$this->shmId = shmop_open($shmkey, "c", 0644, $this->memSize );
$this->maxQSize = $this->memSize / $this->blockSize;

// 申?一个信号量
$this->semId = sem_get($shmkey, 1);
sem_acquire($this->semId); // 申请进入临界区

$this->init();
}

private function init()
{
if ( file_exists($this->filePtr) ){
$contents = file_get_contents($this->filePtr);
$data = explode( '|', $contents );
if ( isset($data[0]) && isset($data[1])){
$this->front = (int)$data[0];
$this->rear  = (int)$data[1];
}
}
}

public function getLength()
{
return (($this->rear - $this->front + $this->memSize) % ($this->memSize) )/$this->blockSize;
}

public function enQueue( $value )
{
if ( $this->ptrInc($this->rear) == $this->front ){ // 队满
return false;
}

$data = $this->encode($value);
shmop_write($this->shmId, $data, $this->rear );
$this->rear = $this->ptrInc($this->rear);
return true;
}

public function deQueue()
{
if ( $this->front == $this->rear ){ // 队空
return false;
}
$value = shmop_read($this->shmId, $this->front, $this->blockSize-1);
$this->front = $this->ptrInc($this->front);
return $this->decode($value);
}

private function ptrInc( $ptr )
{
return ($ptr + $this->blockSize) % ($this->memSize);
}

private function encode( $value )
{
$data = serialize($value) . "__eof";
echo '';

echo strlen($data);
echo '';

echo $this->blockSize -1;
echo '';

if ( strlen($data) > $this->blockSize -1 ){
throw new Exception(strlen($data)." is overload block size!");
}
return $data;
}

private function decode( $value )
{
$data = explode("__eof", $value);
return unserialize($data[0]);
}

public function __destruct()
{
$data = $this->front . '|' . $this->rear;
file_put_contents($this->filePtr, $data);

sem_release($this->semId); // 出临界区, 释放信号量
}
}

/*
// 进队操作
$shmq = new ShmQueue();
$data = 'test data';
$shmq->enQueue($data);
unset($shmq);
// 出队操作
$shmq = new ShmQueue();
$data = $shmq->deQueue();
unset($shmq);
*/
?>

<?php
error_reporting(E_ALL);
$a = 'I am test.';
$b = & $a;

echo $b ."n";
?>

不用说 % php -f gc.php 输出结果非常明了:
hy0kl% php -f gc.php
I am test.

<?php
error_reporting(E_ALL);
$a = 'I am test.';
$b = & $a;

$b = 'I will change?';                                                         

echo $a ."n";
echo $b ."n";
?>
执行结果依然很明显:
hy0kl% php -f gc.php
I will change?
I will change?

<?php
error_reporting(E_ALL);
$a = 'I am test.';
$b = & $a; 

unset($a);

echo $a ."n";
echo $b ."n";
?>
是不是得想一下下呢?
hy0kl% php -f gc.php
Notice: Undefined variable: a in /usr/local/www/apache22/data/test/gc.php on line 8
I am test.

<?php
error_reporting(E_ALL);
$a = 'I am test.';
$b = & $a;

unset($b);                                                                     

echo $a ."n";
echo $b ."n";
?>

<?php
error_reporting(E_ALL);
$a = 'I am test.';
$b = & $a;

$a = null;

echo '$a = '. $a ."n";
echo

<?php                                                                        
error_reporting(E_ALL);
$a = 'I am test.';
$b = & $a;

$b = null;

echo '$a = '. $a ."n";
echo '$b = '. $b ."n";
?>

  
$paramArr = array(   
    ’method’    => ’taobao.taobaoke.items.get’,  //API名称   
    ’fields’    =>’num_iid,title,nick,pic_url,price,click_url,seller_credit_score,   
commission,commission_rate,volume’,   
    ’pid’       =>YOUR PID,   
    ’page_size’ =>YOUR PAGE_SIZE,   
    ’sort’      =>YOUR SORT,   
    ’keyword’   =>your keyword,   
);   
$this->load->helper(‘taoapi’);   
$result['item_list'] = send($paramArr);  

<?php

/**

* QQ开发平台 SDK

* 作者：偶尔陶醉

* blog: www.stutostu.com

*/ 

class Qq_sdk{ 

//配置APP参数

private $app_id = 你的APP ID; 

private $app_secret = ‘你的APP_secret’; 

private $redirect = 你的回调地址;

function __construct() 

{ 

} 

/**

* [get_access_token 获取access_token]

* @param [string] $code [登陆后返回的$_GET['code']]

* @return [array] [expires_in 为有效时间 , access_token 为授权码 ; 失败返回 error , error_description ]

*/ 

function get_access_token($code) 

{ 

//获取access_token

$token_url = ‘https://graph.qq.com/oauth2.0/token?grant_type=authorization_code&’

. ‘client_id=’ . $this->app_id . ‘&redirect_uri=’ . urlencode($this->redirect)//回调地址

. ‘&client_secret=’ . $this->app_secret . ‘&code=’ . $code; 

$token = array(); 

//expires_in 为access_token 有效时间增量 

parse_str($this->_curl_get_content($token_url), $token); 

return $token; 

} 

/**

* [get_open_id 获取用户唯一ID，openid]

* @param [string] $token [授权码]

* @return [array] [成功返回client_id 和 openid ;失败返回error 和 error_msg]

*/ 

function get_open_id($token) 

{ 

$str = $this->_curl_get_content(‘https://graph.qq.com/oauth2.0/me?access_token=’ . $token);

if (strpos($str, “callback”) !== false) 

{ 

$lpos = strpos($str, “(“); 

$rpos = strrpos($str, “)”); 

$str = substr($str, $lpos + 1, $rpos – $lpos -1); 

} 

$user = json_decode($str, TRUE); 

return $user; 

} 

/**

* [get_user_info 获取用户信息]

* @param [string] $token [授权码]

* @param [string] $open_id [用户唯一ID]

* @return [array] [ret：返回码，为0时成功。msg为错误信息,正确返回时为空。...params]

*/ 

function get_user_info($token, $open_id) 

{ 

//组装URL

$user_info_url = ‘https://graph.qq.com/user/get_use
r_info?’

. ‘access_token=’ . $token 

. ‘&oauth_consumer_key=’ . $this->app_id 

. ‘&openid=’ . $open_id 

. ‘&format=json’; 

$info = json_decode($this->_curl_get_content($user_info_url), TRUE); 

return $info; 

} 

private function _curl_get_content($url) 

{ 

$ch = curl_init(); 

curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE); 

curl_setopt($ch, CURLOPT_URL, $url); 

//设置超时时间为3s

curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, 3); 

$result = curl_exec($ch); 

curl_close($ch); 

return $result; 

} 

} 

/* end of Qq_sdk.php */ 

if(empty($_GET['code'])) 

{ 

exit(‘参数非法’); 

} 

include(‘qq_sdk’); 

$qq_sdk = new Qq_sdk(); 

$token = $qq_sdk->get_access_token($_GET['code']); 

print_r($token); 

$open_id = $qq_sdk->get_open_id($token['access_token']); 

print_r($open_id); 

$user_info = $qq_sdk->get_user_info($token['access_token'], $open_id['openid']); 

print_r($user_info); 

<?php 

$start = microtime(TRUE); 

main(); 

function main($img = ‘colors_files/T1OX3eXldXXXcqfYM._111424.jpg’) 

{ 

list($width, $height, $mime_code) = getimagesize($img); 

$im = null; 

$point = array(); 

switch ($mime_code) 

{ 

# jpg 

case 2: 

$im =imagecreatefromjpeg($img); 

break; 

# png 

case 3: 

default: 

exit(‘擦 ，什么图像？解析不了啊’); 

} 

$new_width = 100; 

$new_height = 100; 

$pixel = imagecreatetruecolor($new_width, $new_height); 

imagecopyresampled($pixel, $im, 0, 0, 0, 0, $new_width, $new_height, $width, $height); 

run_time(); 

$i = $new_width; 

while ($i–) 

{ 

# reset高度 

$k = $new_height; 

while ($k–) 

{ 

$rgb = ImageColorAt($im, $i, $k); 

array_push($point, array(‘r’=>($rgb >> 16) & 0xFF, ‘g’=>($rgb >> 8) & 0xFF, ‘b’=>$rgb & 0xFF)); 

} 

} 

imagedestroy($im); 

imagedestroy($pixel); 

run_time(); 

$color = kmeans($point); 

run_time(); 

foreach ($color as $key => $value) 

&nb
sp; { 

echo ‘<br><span style=“background-color:’ . RGBToHex($value[0]) . ‘” >’ . RGBToHex($value[0]) . ‘</span>’; 

} 

} 

function run_time() 

{ 

global $start; 

echo ‘<br/>消耗:’, microtime(TRUE) – $start; 

} 

function kmeans($point=array(), $k=3, $min_diff=1) 

{ 

global $ii; 

$point_len = count($point); 

$clusters = array(); 

$cache = array(); 

for ($i=0; $i < 256; $i++) 

{ 

$cache[$i] = $i*$i; 

} 

# 随机生成k值 

$i = $k; 

$index = 0; 

while ($i–) 

{ 

$index = mt_rand(1,$point_len-100); 

array_push($clusters, array($point[$index], array($point[$index]))); 

} 

run_time(); 

$point_list = array(); 

$run_num = 0; 

while (TRUE) 

{ 

foreach ($point as $value) 

{ 

$smallest_distance = 10000000; 

# 求出距离最小的点 

# index用于保存point最靠近的k值 

$index = 0; 

$i = $k; 

while ($i–) 

{ 

$distance = 0; 

foreach ($value as $key => $p1) 

{ 

&n
bsp; if ($p1 > $clusters[$i][0][$key]) 

{ 

$distance += $cache[$p1 - $clusters[$i][0][$key]]; 

} 

else 

{ 

$distance += $cache[$clusters[$i][0][$key] – $p1]; 

} 

} 

$ii++; 

if ($distance < $smallest_distance) 

{ 

$smallest_distance = $distance; 

$index = $i; 

} 

} 

$point_list[$index][] = $value; 

} 

$diff = 0; 

# 1个1个迭代k值 

$i = $k; 

while ($i–) 

{ 

$old = $clusters[$i]; 

# 移到到队列中心 

$center = calculateCenter($point_list[$i], 3); 

# 形成新的k值集合队列 

$new_cluster = array($center, $point_list[$i]); 

$clusters[$i] = $new_cluster; 

# 计算新的k值与队列所在点的位置 

$diff = euclidean($old[0], $center); 

} 

# 判断是否已足够聚合 

if ($diff < $min_diff) 

{ 

break; 
>

} 

} 

echo ‘—>’.$ii; 

return $clusters; 

} 

# 计算2点距离 

$ii = 0; 

function euclidean($p1, $p2) 

{ 

$s = 0; 

foreach ($p1 as $key => $value) 

{ 

$temp = ($value – $p2[$key]); 

$s += $temp*$temp; 

} 

return sqrt($s); 

} 

# 移动k值到所有点的中心 

function calculateCenter($point_list, $attr_num) { 

$vals = array(); 

$point_num = 0; 

$keys = array_keys($point_list[0]); 

foreach($keys as $value) 

{ 

$vals[$value] = 0; 

} 

foreach ($point_list as $arr) 

{ 

$point_num++; 

foreach ($arr as $key => $value) 

{ 

$vals[$key] += $value; 

} 

} 

foreach ($keys as $index) 

{ 

$vals[$index] = $vals[$index] / $point_num; 

} 

return $vals; 

} 

function RGBToHex($r, $g=”, $b=”) 

{ 

if (is_array($r)) 

{ 

$b = $r['b']; 

$g = $r['g']; 

$r = $r['r']; 

} 

$hex = “#”; 

$hex.= str_pad(dechex($r), 2, ’0′, STR_PAD_LEFT); 

$hex.= str_pad(dechex($g), 2, ’0′, STR_PAD_LEFT); 

$hex.= str_pad(dechex($b), 2, ’0′, STR_PAD_LEFT); 

return $hex; 

} 

?>