〖PHP中实现ASP中的Application 功能〗

/*

作者: 何志强[hzq@chinaasp.com hhzqq@21cn.com]

主页: http://www.phpchina.com/

ICQ : 50721529

版本: 1.0

未经本人同意,不得以任何方式转载

注意PHP需要有Semaphore and shared memory functions支持:

从源代码安装PHP时,在./configure后面加上--enable-sysvsem和--enable-sysvshm

*/

if(!defined("__Class_Application")){

define("__Class_Application",1,1);

define("Semaphore_Key",1000,1);

define("SharedMem_Key",2000,1);

define("SharedMem_Size",65535,1); //共享内存大小

class Application{

var $SemaphoreID;

var $SharedMemID;

var $VarIndexes;

function Application(){

$this->SemaphoreID = sem_get(Semaphore_Key,1,0600);

$this->SharedMemID = shm_attach(SharedMem_Key,SharedMem_Size,0600);

$this->lock();

$this->VarIndexes = @shm_get_var($this->SharedMemID,0);

if(empty($this->VarIndexes)){

$this->VarIndexes = array();

shm_put_var($this->SharedMemID,0,$this->VarIndexes);

}

$this->unlock();

}

//在对共享内存进行操作前请调用该函数,防止多个进程同时对该共享内存进行操作

function lock(){

sem_acquire($this->SemaphoreID);

}

//在对共享内存操作完后请调用该函数,允许其它进程对该共享内存进行操作

function unlock(){

sem_release($this->SemaphoreID);

}

//取出存在共享内存中的某变量,返回false表示共享内存中无该变量

function read($name){

if(!isset($this->VarIndexes[$name])) return false;

$GLOBALS[$name] = shm_get_var($this->SharedMemID,$this->VarIndexes[$name]);

return true;

}

//读出存在共享内存中的所有变量

function readall(){

reset($this->VarIndexes);

while(list($name,$id)=each($this->VarIndexes))

$GLOBALS[$name] = shm_get_var($this->SharedMemID,$id);

}

//将指定变量存入共享内存

function save($name){

if(!isset($this->VarIndexes[$name])){

$this->VarIndexes[$name] = count($this->VarIndexes)+1;

shm_put_var($this->SharedMemID,0,$this->VarIndexes);

}

shm_put_var($this->SharedMemID,$this->VarIndexes[$name],$GLOBALS[$name]);

}

//保存在共享内存中的所有变量

function saveall(){

reset($this->VarIndexes);

while(list($name,$id)=each($this->VarIndexes)){

if(isset($GLOBALS[$name]))

shm_put_var($this->SharedMemID,$id,$GLOBALS[$name]);

}

}

//清空共享内存中的所有变量

function clear(){

reset($this->VarIndexes);

while(list($name,$id)=each($this->VarIndexes))

shm_remove_var($this->SharedMemID,$id);

$this->VarIndexes = array();

shm_put_var($this->SharedMemID,0,$this->VarIndexes);

}

}

}

?>

/*测试

class ClassTest{

var $name;

function ClassTest($name){

$this->name = $name;

}

}

$App = new Application();

$App->lock();

if($cmd=='clear') $App->clear();

if($App->read('count')) $count++;

else $count = 1;

$App->save('count');

if($App->read('array')){

echo '存放数组测试:
';

for($i=0;$i';

echo '

---

';

}

else{

$array = array('PHP','JSP','ASP');

$App->save('array');

}

if($App->read('MyClass')){

echo '存放Class测试:
';

echo '    '.$MyClass->name.'
';

echo '

---

';

}

else{

$MyClass = new ClassTest('何志强');

$App->save('MyClass');

}

$App->unlock();

echo 'this page has been visited '.$count.'
';

echo 'you can restart from here
';

*/

?>

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