如何比较php的可调用类型？

发布时间：2020-12-13 17:47:18 所属栏目：PHP教程来源：网络整理

导读：如何比较两种可调用类型以检查它们是相同还是相同？ function addCallable(callable $cb){ if(/*already exists*/) throw new Exception("Callable was already added to the collection"); else $this-collection[] = $cb;}function removeCallable(callabl

如何比较两种可调用类型以检查它们是相同还是相同？

function addCallable(callable $cb)
{
    if(/*already exists*/)
        throw new Exception("Callable was already added to the collection");
    else
        $this->collection[] = $cb;
}

function removeCallable(callable $cb)
{
    $key = array_search(/* ??? */);
    unset($this->collection[$key]);
}

$this->addCallable(array('MyClass','myCallbackMethod'));
try{ $this->addCallable('MyClass::myCallbackMethod'); }catch(Exception $e){}
$this->removeCallable('MyClass::myCallbackMethod');

非常感谢你

解决方法

您可以使用 is_callable函数的第三个参数来获取可调用名称,即字符串.

如果callable是array(‘MyClass’,’myCallbackMethod’),那么可调用的名称将是’MyClass :: myCallbackMethod’.

function addCallable(callable $cb)
{
    is_callable($cb,true,$callable_name);

    if(isset($this->collection[$callable_name])) {
        throw new Exception("Callable was already added to the collection");
    } else {
        $this->collection[$callable_name] = $cb;
    }          
}

function removeCallable(callable $cb)
{
    is_callable($cb,$callable_name);
    unset($this->collection[$callable_nam]); 
}

（编辑：李大同）

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