PHP单例模式模拟Java Bean实现方法示例_php技巧_

 /** * author Winter * 2016-11-22 * PHP的单例模式 * 模拟Java Bean * Class Php_bean */ class Php_bean{ private static $_instance = null; private function __construct(){} private $hit = 0;//命中次数 private $array = array();//缓存 private $itratorCount = 0;//迭代次数 public function add_itratorCount(){ $this->itratorCount ++; } public function get_itratorCount(){ return $this->itratorCount; } public function set_cache($row,$col,$value){ $this->array[$row."_".$col] = $value; } public function get_cache($row,$col){ if(isset($this->array[$row."_".$col])){ return $this->array[$row."_".$col]; }else{ return false; } } public function add_hit(){ $this->hit ++; } public function get_hit(){ return $this->hit; } public static function instance(){ if(self::$_instance instanceof self) return self::$_instance; self::$_instance = new self; return self::$_instance; } } /** * @param $row 行 * @param $col 列 * @return int */ function get_value($row,$col){ $php_bean = Php_bean::instance(); $php_bean->add_itratorCount(); if($col > $row) return 0; if($row <=0) return 0; if($col == $row) return 1; if($row == 1) return 1; if($col == 1) return 1; $pre = $php_bean->get_cache($row-1,$col-1); $next = $php_bean->get_cache($row-1,$col-0); if($pre === false){ $pre = get_value($row-1,$col-1); $php_bean->set_cache($row-1,$col-1,$pre); }else{ $php_bean->add_hit(); } if($next === false){ $next = get_value($row-1,$col-0); $php_bean->set_cache($row-1,$col-0,$next); }else{ $php_bean->add_hit(); } $value = $pre + $next; return $value; } $v = get_value(6,6); var_dump($v); $php_bean_obj = Php_bean::instance(); echo "hit:".$php_bean_obj->get_hit()."
"; echo "itratorCount:".$php_bean_obj->get_itratorCount()."
";