數組對比效率問題

兩個數組，ArrayA和ArrayB

$arrayA = array (  0 => array (    0 => 1,    4 => 1,    6 => 1,  ),  1 => array (    1 => 1,    3 => 1,    5 => 1,  ),  2 => array (    7 => 1,    8 => 1,    9 => 1,  ),);

$arrayB = array (  0 => array (    0 => 'a',    1 => 'b',    2 => 'c',    3 => 'd',    4 => 'e',    5 => 'f',    6 => 'g',    7 => 'h',    8 => 'i',    9 => 'j',  ),  1 => array (    0 => 'a',    1 => 'b',    2 => 'c',    3 => 'd',    4 => 'e',    5 => 'f',    6 => 'g',    7 => 'h',    8 => 'i',    9 => 'j',  ),  2 => array (    0 => 'a',    1 => 'b',    2 => 'c',    3 => 'd',    4 => 'e',    5 => 'f',    6 => 'g',    7 => 'h',    8 => 'i',    9 => 'j',  ),);

希望得到結果

$result = array (  0 => array (    0 => 'a',    4 => 'e',    6 => 'g',  ),  1 => array (    1 => 'b',    3 => 'd',    5 => 'f',  ),  2 => array (    7 => 'h',    8 => 'i',    9 => 'j',  ),);

我現在的做法是做兩層迴圈

$result = array ();foreach ($arrayA as $k => $v) {  foreach ($v as $kk => $vv) {    $result[$k][$kk] = $arrayB[$k][$kk];  }}

有沒有什麼效率更高的方式呢？

回複內容：

兩個數組，ArrayA和ArrayB

$arrayA = array (  0 => array (    0 => 1,    4 => 1,    6 => 1,  ),  1 => array (    1 => 1,    3 => 1,    5 => 1,  ),  2 => array (    7 => 1,    8 => 1,    9 => 1,  ),);

$arrayB = array (  0 => array (    0 => 'a',    1 => 'b',    2 => 'c',    3 => 'd',    4 => 'e',    5 => 'f',    6 => 'g',    7 => 'h',    8 => 'i',    9 => 'j',  ),  1 => array (    0 => 'a',    1 => 'b',    2 => 'c',    3 => 'd',    4 => 'e',    5 => 'f',    6 => 'g',    7 => 'h',    8 => 'i',    9 => 'j',  ),  2 => array (    0 => 'a',    1 => 'b',    2 => 'c',    3 => 'd',    4 => 'e',    5 => 'f',    6 => 'g',    7 => 'h',    8 => 'i',    9 => 'j',  ),);

希望得到結果

$result = array (  0 => array (    0 => 'a',    4 => 'e',    6 => 'g',  ),  1 => array (    1 => 'b',    3 => 'd',    5 => 'f',  ),  2 => array (    7 => 'h',    8 => 'i',    9 => 'j',  ),);

我現在的做法是做兩層迴圈

$result = array ();foreach ($arrayA as $k => $v) {  foreach ($v as $kk => $vv) {    $result[$k][$kk] = $arrayB[$k][$kk];  }}

有沒有什麼效率更高的方式呢？

使用 PHP 的內建函數 array_intersect 即可

參考

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