它是可能的,在PHP中,在不使用递归或引用的情况下扁平化(bi/multi)维数组?
我只对值感兴趣,所以键可以忽略,我认为在array_map()和array_values()的行。
它是可能的,在PHP中,在不使用递归或引用的情况下扁平化(bi/multi)维数组?
我只对值感兴趣,所以键可以忽略,我认为在array_map()和array_values()的行。
当前回答
你可以用茴香酒来做:
$result = Arrays::flatten($multidimensional);
看到:
其他回答
如果你想保留中间键:
function flattenArray(array &$result, $value, string $key = "")
{
if (!is_array($value)) {
$result[$key] = $value;
return $result;
}
foreach ($value as $subKey => $subArray) {
$newKey = $key !== "" ? $key . "_" . $subKey : $subKey;
flattenArray($result, $subArray, $newKey);
}
return $result;
}
$nestedArray = [
"name" => "John",
"pets" => [
["id" => 1, "name" => "snooop"],
["id" => 2, "name" => "medor"],
],
"job" => ["title" => "developper"],
];
$intermediateResult = [];
$flattened = flattenArray($intermediateResult, $nestedArray);
var_dump($flattened);
这将输出:
array(6) {
["name"]=>
string(4) "John"
["pets_0_id"]=>
int(1)
["pets_0_name"]=>
string(6) "snooop"
["pets_1_id"]=>
int(2)
["pets_1_name"]=>
string(5) "medor"
["job_title"]=>
string(10) "developper"
}
看到https://ideone.com/KXLtzZ stdout
从PHP v7.4开始,可以使用展开操作符并合并数组。简单有效。
$flatArr = array_merge(...$originalArray);
对于php 5.2
function flatten(array $array) {
$result = array();
if (is_array($array)) {
foreach ($array as $k => $v) {
if (is_array($v)) {
$result = array_merge($result, flatten($v));
} else {
$result[] = $v;
}
}
}
return $result;
}
扁平化数组的Laravel助手是Arr::flatten()
非递归,非基于引用的实现,这可能比基于递归的实现更容易理解。 可以管理任意深度多维数组,不能平化关联数组。 它的工作原理是每个周期将数组压平一层,直到它完全有效。
function array_flatten(): array{
$result = func_get_args();
// check all elements of $list are not arrays
$_is_flat = function (array $list): bool {
foreach ($list as $val) {
if (is_array($val)) {
return false;
}
}
return true;
};
do {
$tmp = [];
foreach ($result as $val) {
if (is_array($val)) {
if (!array_is_list($val)) {
throw new \Exception(sprintf("array_flatten can't handle associative arrays: %s", json_encode($val)));
}
$tmp = array_merge($tmp, $val);
} else {
$tmp[] = $val;
}
}
$result = $tmp;
} while (!$_is_flat($result));
return $result;
}
以下是它处理的情况:
assertEquals(array_flatten(1, 2), $expected = [1, 2], 'array_flatten 1a');
assertEquals(array_flatten([1], [2]), $expected = [1, 2], 'array_flatten 1b');
assertEquals(array_flatten([1], [[2], 3]), $expected = [1, 2, 3], 'array_flatten 1c');
assertEquals(array_flatten(1, [2, 3], [4, 5]), $expected = [1, 2, 3, 4, 5], 'array_flatten 2');
assertEquals(array_flatten(2, 3, [4, 5], [6, 7], 8), $expected = [2, 3, 4, 5, 6, 7, 8], 'array_flatten 3');
assertEquals(array_flatten([2, 3, [4, 5], [6, 7], 8]), $expected = [2, 3, 4, 5, 6, 7, 8], 'array_flatten 4');
assertEquals(array_flatten([2, [3, [4, [5]], [6, [7]], 8]]), $expected = [2, 3, 4, 5, 6, 7, 8], 'array_flatten complex');