javascript - array merging problem

Question

These are the two arrays before merging

This is the merged array

How to write this foreach?

Answer 1

Let me talk about my understanding of the purpose of the question first. These two arrays should be taken from two different tables. Date and a_id should be the same fields. Merging is also based on these two. If the date and a_id are the same, then To merge the data into an array, the following is the code:

$array1 = array(..); // The first array merged
$array2 = array(..); // The second array merged
$array = array_merge($array1 , $array2); / / Combine two arrays
$new_array = array();
foreach($array as $v){

foreach($v as $key => $val){
    if(array_key_exists($val['date'].'-'.$val['a_id'] , $new_array)){
        // 存在相同的数组下标说明两个数组有相同的date,a_id，那么直接合并
        $new_array[$val['date'].'-'.$val['a_id']] = array_merge($new_array[$val['date'].'-'.$val['a_id']],$val);
    }else{
        $new_array[$val['date'].'-'.$val['a_id']] = $val;
    }
}

}

Explanation: The subscript of the processed array new_array is date-a_id, which is used as the only subscript

Answer 2

I don’t know what to press