数组对比效率问题-PHP Tutorial-php.cn

数组对比效率问题

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Release： 2016-06-06 20:51:09

Original

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两个数组，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,
  ),
);

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$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',
  ),
);

Copy after login

希望得到结果

$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',
  ),
);

Copy after login

我现在的做法是做两层循环

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

Copy after login

有没有什么效率更高的方式呢？

回复内容：

两个数组，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,
  ),
);

Copy after login

$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',
  ),
);

Copy after login

希望得到结果

$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',
  ),
);

Copy after login

我现在的做法是做两层循环

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

Copy after login

有没有什么效率更高的方式呢？

使用 PHP 的内置函数 array_intersect 即可

参考