Question

我有一个基本函数，它接受两个数组并根据键合并它们。它适用于具有不同键但最终具有相同数量项的数组。功能很好。但是，它一次只能输入两个数组进行合并。

如何进行修改，以便合并n个数组？

PHP

protected function arrayMergeKeys( $a, $b )
{
    $retArr = array();
    // I used min(countA, countB) so there will be no errors on
    // unbalanced array item counts.
    for ( $i = 0; $i < min( count( $a ), count( $b ) ); $i++ ) {
        $retArr[ $i ] = array_merge( $a[ $i ], $b[ $i ] );
    } // for end
    return $retArr;
}

期望的结果是使用三个数组调用该函数：$merged_arrays = arrayMergeKeys($a, $b, $c);

输入

//$a
Array
(
    [a] => 'new value'
    [b] => 2
    [c] => 3
)
//$b
Array
(
    [1] => 'blah'
    [2] => 'dud'
    [3] => 697
)
//$c
Array
(
    [pet] => 'dog'
    [breed] => 'german shepher'
    [age] => 100
)

输出

Array
{
    [a] => 'new value'
    [1] => 'blah'
    [pet] => 'dog'
}
Array
{
    [b] => 2
    [2] => 'dud'
    [breed] => 'german shepher'
}
Array
{
    [c] => 3
    [3] => 697
    [age] => 100
}

Answer 1

可以进一步优化，请再次重新检查

function arrayMergeKeys()
{
    $retArr = array();

    $arrayArgs = func_get_args();

    //print_r($arrayArgs);

    $minCount = count($arrayArgs[0]);

    foreach($arrayArgs as $array){      
        if($minCount > count($array)){
            $minCount = count($array);
        }
    }

    // I used min(countA, countB) so there will be no errors on
    // unbalanced array item counts.
    for ( $i = 0; $i < $minCount; $i++ ) {

        foreach($arrayArgs as $array){    

            $iCount = count($array);

            for($j=0; $j<=$iCount; $j++)
            {
                if($i==$j){
                    $arrayKeys = array_keys($array);
                    if(isset($arrayKeys[$i])){
                        $retArr[ $i ][$arrayKeys[$i]] = $array[$arrayKeys[$i]];
                        break;
                    }                   
                }
            }

        }

    } // for end

    return $retArr;
}

$a = Array
(
        'a' => 'new value',
        'b' => 2,
        'c' => 3
);

$b = array
(
        '1' => 'blah',
        '2' => 'dud',
        '3' => 697
);
$c = array
(
        'pet' => 'dog',
        'breed' => 'german shepher',
        'age' => 100
);


print_r(arrayMergeKeys($a, $b, $c));

Answer 2

保持原来的功能不受影响，你可以这样做：

function arrayMulitMergeKeys() {
    $arrayArgs = func_get_args();
    $c = count($arrayArgs);
    $result = arrayArgs[0];
    for($i = 1; $i < $c; $i++) {
       $result = arrayMergeKeys($result, $arrayArgs[$i]);
    }
    return $result;
}

Answer 3

这里有一些伪代码可以指向正确的方向。

function mergeArrays(a, b, c)

    arrays = []
    shortestLength = min(a.len, b.len, c.len)

    for i in [0 .. shortestLength - 1]
        arrays[i] = [ a[i], b[i], c[i] ];

    return arrays

如果您将此作为练习，我建议您也执行以下操作： mergeArrays(arr)其中arr是需要合并的数组数组。

Answer 4

Haven未经过测试，但这应该可行

protected function arrayMergeKeys(...$arrs) {
    $retArr = array();

    // I used min(countA, countB) so there will be no errors on
    // unbalanced array item counts.

    $countArr = array();

    foreach ($arrs as $arr) {
        $countArr[] = count($arr);
    }

    $min = min($countArr);

    for ( $i = 0; $i < $min; $i++ ) {
        $mergeArr = array();

        foreach ($arrs as $arr) {
            $mergeArr[] = $arr[$i];
        }

        $retArr[ $i ] = array_merge( $mergeArr );
    } // for end

    return $retArr;
}

Answer 5

您可以简单地添加＆＃39;数组：

$a = array
(
'a' => 'new value',
'b' => '2',
'c' => '3'
);
//$b
$b = array
(
'1' => 'blah',
'2' => 'dud',
'3' => '697'
);
//$c
$c = array
(
'pet' => 'dog',
'breed' => 'german shepher',
'age' => 100
);

$result=  $a+$b+$c;
print_r($result);

<强>输出

Array ( [a] => new value [b] => 2 [c] => 3 [1] => blah [2] => dud [3] => 697 [pet] => dog [breed] => german shepher [age] => 100 )

使用共享相同数量项的键合并数组

5 个答案: