如何在PHP中翻转90度(转置)多维数组?例如:
// Start with this array
$foo = array(
'a' => array(
1 => 'a1',
2 => 'a2',
3 => 'a3'
),
'b' => array(
1 => 'b1',
2 => 'b2',
3 => 'b3'
),
'c' => array(
1 => 'c1',
2 => 'c2',
3 => 'c3'
)
);
$bar = flipDiagonally($foo); // Mystery function
var_dump($bar[2]);
// Desired output:
array(3) {
["a"]=>
string(2) "a2"
["b"]=>
string(2) "b2"
["c"]=>
string(2) "c2"
}
你会如何实施flipDiagonally()
?
发布于 2018-01-24 14:48:44
function transpose($array) {
array_unshift($array, null);
return call_user_func_array('array_map', $array);
}
或者如果你使用的是PHP 5.6或更高版本:
function transpose($array) {
return array_map(null, ...$array);
}
发布于 2018-01-24 15:34:59
有两个循环。
function flipDiagonally($arr) {
$out = array();
foreach ($arr as $key => $subarr) {
foreach ($subarr as $subkey => $subvalue) {
$out[$subkey][$key] = $subvalue;
}
}
return $out;
}
https://stackoverflow.com/questions/-100007232
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