dongshi8038 2013-11-27 17:49
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如何计算可调用的唯一哈希值

I'm trying to write a memoization function, and I just realized this solution does not work when the callback is not a simple string. For example, PHP can accept a callback in the form array($this,'memberFunc'), which is not amenable to serialization.

Then I realized that we don't really want to hash/serialize the whole callback function/object anyway, we just need a unique ID for it so we can check for reference equality. I thought spl_object_hash would do the trick, but it doesn't work on arrays.

Is there another way to generate a unique reference ID for a callable?

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  • dra8603 2013-11-27 17:54
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    You can always cast to object for hashing purposes:

    <?php
    
    class Foo{
        public function __construct(){
            $foo = array($this,'memberFunc');
    
            var_dump( spl_object_hash((object)$foo) );
            var_dump( spl_object_hash((object)$foo) );
        }
    }
    
    new Foo;
    
    string(32) "00000000532ba9fd000000000cc9b0a5"
    string(32) "00000000532ba9fd000000000cc9b0a5"
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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