php从给定数组生成所有组合 [英] php generate all combinations from given array
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问题描述
转换此PHP
数组的最简单方法是什么
What is the simplest way to convert this PHP
array
$a = array('A' => array(1, 2),
'B' => array(3, 4),
'C' => array(5));
对此:
$result = array(
array('A' => 1, 'B' => 3, 'C' => 5),
array('A' => 1, 'B' => 4, 'C' => 5),
array('A' => 2, 'B' => 3, 'C' => 5),
array('A' => 2, 'B' => 4, 'C' => 5),
);
在开发期间,
$a
可能有许多不同的keys
我不知道.所以我需要
生成给定数组中的所有组合.
$a
may have many different keys
I don't know during development time. So I need to
generate all combinations in given array.
更新:
我必须基于传入数组生成URLs
.所以我不知道在开发期间会得到多少个参数.我只有参数数组,例如.
I have to generate URLs
based in incoming array. So I don't know how many parameters I will get during development time. I have only array of parameters, it can be e.g.
$a = array('A' => array(5,3, 1));
结果将是:
$result = array(
array('A' => 5),
array('A' => 3),
array('A' => 1));
或
$a = array('X' => array(5), 'D' => array(4, 7));
结果将是:
$result = array(
array('X' => 5, 'D' => 4),
array('X' => 5, 'D' => 7));
推荐答案
喜欢这个:
$a = array('A' => array(1, 2),
'B' => array(3, 4),
'C' => array(5));
function get_combinations($arrays) {
$result = array(array());
foreach ($arrays as $property => $property_values) {
$tmp = array();
foreach ($result as $result_item) {
foreach ($property_values as $property_value) {
$tmp[] = array_merge($result_item, array($property => $property_value));
}
}
$result = $tmp;
}
return $result;
}
输出
var_dump(get_combinations($a));
array (size=4)
0 =>
array (size=3)
'A' => int 1
'B' => int 3
'C' => int 5
1 =>
array (size=3)
'A' => int 1
'B' => int 4
'C' => int 5
2 =>
array (size=3)
'A' => int 2
'B' => int 3
'C' => int 5
3 =>
array (size=3)
'A' => int 2
'B' => int 4
'C' => int 5
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