for example, according to the passed array, if the elements in the array are the same (the order may be different), convert to a string as the key of redis
$a=["a","b","c"];
$b=["b","a","c"];
$c=["c","b","a"];
$d=["c","b","a","d"];
function test($arr){
// do sth
$tmp = doSth($arr);
$redis->set(implode(",",$tmp),time());
}
function doSth($arr){
sort($arr);//
return $arr;
}
//$a,$b,$c a b c key doSth($a) doSth($b) doSth($c) $d
learn about these two methods and make rational use of them.
PHP: array_intersect-Manual- http://php.net/manual/zh/func.
PHP: array_diff-Manual- http://php.net/manual/zh/func.
in fact, someone upstairs has already answered to the point. Using array_intersect to get intersection,
is actually a question of similarity calculation. Yesterday I wrote an article about using article Tag to recommend similar articles , using this method,
jaccard similarity
given that the Jaccard coefficients of two sets A blockquote Bjaccard are defined as the ratio of the size of the intersection of An and B to the size of the union of An and B, it is defined as follows: < / Jaccard >
as long as the similarity is 1, it proves that the elements in the two arrays are exactly the same
.
create a collection set iterate through each array, add to the set collection, and you get the result
if the resources are sufficient, they can be sorted and compared in turn.
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