dragon071111 2017-03-09 20:10
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基于2个值从多维数组中删除重复项

I have an array that looks like this

$array = array(
  array("John","Smith","1"),
  array("Bob","Barker","2"),
  array("Will","Smith","2"),
  array("Will","Smith","4")
);

In the end I want the array to look like this

$array = array(
  array("John","Smith","1"),
  array("Bob","Barker","2"),
  array("Will","Smith","2")
);

The array_unique with the SORT_REGULAR flag checks for all three value. I've seen some solutions on how to remove duplicates based on one value, but I need to compare the first two values for uniqueness.

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  • doumen9709 2017-03-09 20:18
    关注

    Simple solution using foreach loop and array_values function:

    $arr = array(
              array("John","Smith","1"), array("Bob","Barker","2"), 
              array("Will","Smith","2"), array("Will","Smith","4")
    );
    
    $result = [];
    foreach ($arr as $v) {
        $k = $v[0] . $v[1];  // considering first 2 values as a unique key
        if (!isset($result[$k])) $result[$k] = $v;
    }
    
    $result = array_values($result);
    print_r($result);
    

    The output:

    Array
    (
        [0] => Array
            (
                [0] => John
                [1] => Smith
                [2] => 1
            )
    
        [1] => Array
            (
                [0] => Bob
                [1] => Barker
                [2] => 2
            )
    
        [2] => Array
            (
                [0] => Will
                [1] => Smith
                [2] => 2
            )
    )
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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