 2018-01-02 09:12

# 从多维数组中求和并合并重复值

I would like to sum the value of `movements` while keeping an unique value for `day` on the same array.

The base array:

``````array (607)
0 => array (2)
day => "11" (2)
movements => 1
1 => array (2)
day => "11" (2)
movements => 1
2 => array (2)
day => "11" (2)
movements => 1
3 => array (2)
day => "12" (2)
movements => 1
4 => array (2)
day => "12" (2)
movements => 1
5 => array (2)
day => "12" (2)
movements => 1

[...]
``````

The result I am expecting (for each `day` sum `movements`):

``````array (607)
0 => array (2)
day => "11" (2)
movements => 3
1 => array (2)
day => "12" (2)
movements => 3
[...]
``````

Any help would be greatly appreciated.

Edit: What I have tried so far :

• sum-array-values-of-the-same-key: it also sum `day`which is not what I am expecting.
• my own code:

``````\$arr1 = \$stats['data']['vhc']; // contain ['day'] and ['movements']
\$arr2 = \$data['vhc']; // contain ['day'] and ['movements']
\$sum = [];

if (!empty(\$arr1)) {
\$result = [];
foreach (\$arr1 as \$key => \$value) {
if (isset(\$arr2[\$key]['day']) && \$arr2[\$key]['day'] == \$value['day']) {
\$result['day'] = \$value['day'];
\$result['movements'] = \$value['movements'] + \$arr2[\$key]['movements'];
}
array_push(\$sum, \$result);
}
}
``````
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#### 2条回答默认 最新

• douji5397 2018-01-02 09:32
已采纳

You can easily do with `foreach()` and array_values()

``````\$final_array = [];

foreach(\$array as \$arr){
\$final_array[\$arr['day']]['day'] = \$arr['day'];
\$final_array[\$arr['day']]['movements'] = (isset(\$final_array[\$arr['day']]['movements']))? \$final_array[\$arr['day']]['movements']+\$arr['movements'] : \$arr['movements'];
}
\$final_array = array_values(\$final_array);

print_r(\$final_array);
``````

Output:-https://eval.in/957326

已采纳该答案
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• dthp96899 2018-02-16 17:47

This method will not bother overwriting result array data with the same value.

Code: (Demo)

``````\$array=[
['day'=>'11','movements'=>'1'],
['day'=>'11','movements'=>'1'],
['day'=>'11','movements'=>'1'],
['day'=>'12','movements'=>'1'],
['day'=>'12','movements'=>'1'],
['day'=>'12','movements'=>'1']
];
foreach(\$array as \$row){  // iterate all rows
if(!isset(\$result[\$row['day']])){  // if first occurrence of day...
\$result[\$row['day']]=\$row;     // save the full row with day as the temporary key
}else{                                    // if not the first occurrence of day...
}
}
var_export(array_values(\$result));
``````

Output:

``````array (
0 =>
array (
'day' => '11',
'movements' => 3,
),
1 =>
array (
'day' => '12',
'movements' => 3,
),
)
``````
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