PHP 5 + standard function library observer implementation _ PHP Tutorial

PHP 5 + standard function library observer implementation. PHP 5 + standard function library observer implementation PHP Observer design mode implementation is relatively simple, but PHP5 version already supports standard library Library, we only need to simply inherit and implement the PHP 5 + standard function library observer implementation.

The Observer design mode of PHP is relatively simple to implement, but the PHP5 + version already has support for standard library libraries. we only need to simply inherit and implement it.

Observer: implements the standard interface class library SplSubject. One registration method is attach and the other is detach. One notification method: nofity.

 observers =array(); } public function attach(SplObserver $observer){$this->observers[] = $observer; } public function detach(SplObserver $observer){if($idx = array_search($observer, $this->observers,true)) {unset($this->observers[$idx]);} }     /** * * Notify observers one by one (main entry) * * @param none * @return none */ public function notify(){foreach($this->observers as $observer){$observer->update($this);} } public function setValue($value){$this->value = $value;//$this->notify(); } public function getValue(){ return $this->value; }}

Observer: implements the standard interface class library SplObserver. An update method.

 getValue(); }}

 getValue(); }}

Test call (in the same directory ):

 attach(new TSPLObserver());$observer1 = new TSPLObserver1();$subject->attach($observer1);//$subject->attach(new TSPLObserver2());//$subject->detach($observer1);$subject->notify();exit();

Output:

> Php basic. php
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The Observer design mode of ghost PHP is relatively simple to implement, but the PHP 5 version already has support for standard library libraries. we only need to simply inherit and implement it...