【PHP】合并二维数组内指定的相同键并计算另一键的和后组成新的二位数组

问题描述：


array(4) {
  [0] => array(5) {
    ["id"] => int(1)
    ["order_num"] => string(11) "20170823-01"
    ["name"] => string(4) "4015"
    ["num"] => int(2000)
    ["time"] => int(1503590400)
  }
  [1] => array(5) {
    ["id"] => int(2)
    ["order_num"] => string(11) "20170823-02"
    ["name"] => string(4) "4015"
    ["num"] => int(3000)
    ["time"] => int(1503590400)
  }
  [2] => array(5) {
    ["id"] => int(3)
    ["order_num"] => string(11) "20170823-03"
    ["name"] => string(4) "4123"
    ["num"] => int(1000)
    ["time"] => int(1503590400)
  }
  [3] => array(5) {
    ["id"] => int(4)
    ["order_num"] => string(11) "20170823-04"
    ["name"] => string(4) "4123"
    ["num"] => int(1000)
    ["time"] => int(1503590400)
  }
}

原始数组如上
需要将 ["name"] 相同的合并到一起，且所对应的 ["num"]的值为原始数据中两个值的和
可能有多个相同["name"]
因为是新手，试了很多方法都没实现，想请教大牛们，应该怎么实现？
其他的键可以忽略

最终的结果是这种


array(4) {
  [0] => array(5) {
    ["name"] => string(4) "4015"
    ["num"] => int(5000)
        ["time"] => int(1503590400)
  }
  [1] => array(5) {
    ["name"] => string(4) "4123"
    ["num"] => int(2000)
    ["time"] => int(1503590400)
  }

}

答

拿好不谢

$arr = [
    [
        'name'=>111,
        'sum'=>2
    ],
    [
        'name'=>111,
        'sum'=>3
    ],
    [
        'name'=>222,
        'sum'=>5
    ],
];
$tmp = [];
foreach ($arr as $v) {
    if(!isset($tmp[$v['name']])){
        $tmp[$v['name']]['name'] = $v['name'];
        $tmp[$v['name']]['sum'] = $v['sum'];
    }else{
        $tmp[$v['name']]['name'] = $v['name'];
        $tmp[$v['name']]['sum'] += $v['sum'];
    }
}
$out = array_values($tmp);
var_dump($out);

答

创建一个map 遍历二维数组拿到name值(作为map的key) 和num值(value) 每遍历拿到一组值的时候判断map中是否存在以这个name作为key的value值如果不存在放入map 如果存在num相加后覆盖原有value

【PHP】合并二维数组内指定的相同键并计算另一键的和后组成新的二位数组

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