二进制交叉权限微型php类

<?php

class s_allow{

//声明使用场景，任务清单
public $scene,$case_list=array();

//声明指定用户角色、允许值、允许清单
public $allow_value=0,$allow_list=array();


//初始化场景、角色
function __construct($scene,$allow_value=0){
$this->scene=$scene;
$this->case_list=$this->case_list(true);

if ($allow_value) {
$this->allow_value=$allow_value;
$this->allow_list=$this->allow_list($allow_value,true);
}
}


//取得全部任务清单
function case_list($mode=false){
$case_list=config($this->scene,'allow');
return $mode ? $case_list : array_keys($case_list);
}


//取得用户任务清单
function allow_list($allow_value=0,$mode=false){
$buffer=array();
foreach ($this->case_list as $key=>$value) {
if ($allow_value & pow(2,$key-1)) {
$buffer[$key]=$value;
}
}
return $mode ? $buffer : array_keys($buffer);
}


//计算允许值
function allow_value($allow_list=null){
if ($allow_list==null) $allow_list=$this->allow_list;
array_walk($allow_list, function($value,$key) use(&$allow_list){
$allow_list[$key]=pow(2,$value-1);
});
return array_sum($allow_list);
}


//判断是否允许
function is_allow($case){
$case_list=array_flip($this->case_list);
return (bool)($this->allow_value & pow(2,$case_list[$case]-1));
}


}