PHP如何高效地对根据键值对数组元素进行归类？
- WBOY原創
- 2016-06-06 20:08:381187瀏覽
如以下代码：
<code> $arr = [
0 => [
"category" => "red",
"price" => 95
],
1 => [
"category" => "blue",
"price" => 85
],
2 => [
"category" => "red",
"price" => 75
]
];
//我希望将以上其归类为如下数组
[
"red" => [
0 => [
"category" => "red",
"price" => 95
],
1 => [
"category" => "red",
"price" => 75
]
],
"blue" => [
0 => [
"category" => "blue",
"price" => 85
]
]
]</code>
希望大神能给个思路，谢谢
回复内容：
如以下代码：
<code> $arr = [
0 => [
"category" => "red",
"price" => 95
],
1 => [
"category" => "blue",
"price" => 85
],
2 => [
"category" => "red",
"price" => 75
]
];
//我希望将以上其归类为如下数组
[
"red" => [
0 => [
"category" => "red",
"price" => 95
],
1 => [
"category" => "red",
"price" => 75
]
],
"blue" => [
0 => [
"category" => "blue",
"price" => 85
]
]
]</code>
希望大神能给个思路，谢谢
<code><?php $arr = [
0 => [
"category" => "red",
"price" => 95
],
1 => [
"category" => "blue",
"price" => 85
],
2 => [
"category" => "red",
"price" => 75
]
];
$result = array();
foreach($arr as $k=>$v){
//var_dump($v);
//echo $v['price'];
$key = $v['category'];
if(!array_key_exists($key, $result)) $result[$key] =array();
$result[$key][] = $v;
}
var_dump($result);</code>
<code>function group_same_key($arr,$key){
$new_arr = array();
foreach($arr as $k=>$v ){
$new_arr[$v[$key]][] = $v;
}
return $new_arr;
}</code>
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