转置和展平多行数组数据 [英] Transpose and flatten multiple rows of array data
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问题描述
是否有原生 PHP 函数来压缩合并两个数组?
Is there a native PHP function to zip merge two arrays?
看下面的例子:
$a = array("a","b","c");
$b = array("d","e","f");
$c = array("g","h","i");
var_dump(array_merge($a,$b,$c));
这会产生:
array(9) {
[0]=>
string(1) "a"
[1]=>
string(1) "b"
[2]=>
string(1) "c"
[3]=>
string(1) "d"
[4]=>
string(1) "e"
[5]=>
string(1) "f"
[6]=>
string(1) "g"
[7]=>
string(1) "h"
[8]=>
string(1) "i"
}
但是我想要:
array(9) {
[0]=>
string(1) "a"
[1]=>
string(1) "d"
[2]=>
string(1) "g"
[3]=>
string(1) "b"
[4]=>
string(1) "e"
[5]=>
string(1) "h"
[6]=>
string(1) "c"
[7]=>
string(1) "f"
[8]=>
string(1) "i"
}
因此我编写了自己的 - 测试了一个工作 - 功能:
Therfore I wrote my own - tested an working - function:
function array_zip(...$arrays) {
$res = array();
while(true) {
$check_finish = true;
foreach($arrays as $array) {
if(!empty($array)) {
$check_finish = false;
}
}
if($check_finish) {
break;
} else {
foreach($arrays as $key => $array) {
if(!empty($array)) {
array_push($res,array_shift($array));
$arrays[$key] = $array;
}
}
}
}
return $res;
}
但是,是否有本机 PHP 函数来合并这样的数组(可能性能更高)?是否有用于此目的的本机 PHP 函数可以保留键但保留顺序?没有找到…… :-/
However is there a native PHP function to merge arrays like this (maybe more performant)? And is there a native PHP function for this purpose which preserves keys but keeps the order? Did not find sth :-/
推荐答案
没有为此目的的 PHP 原生函数.然而,根据@Mark Baker 的评论,实现这一点的可能性很小:
There is no PHP native function for this purpose. However according to the comment of @Mark Baker there is a short possibility to implement this:
$a = array("a","b","c");
$b = array("d","e","f");
$c = array("g","h","i");
function array_zip(...$arrays) {
return array_merge(...array_map(null, ...$arrays));
}
var_dump(array_zip($a,$b,$c));
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