php數組整合

 $arr=[     ['id'=>1,'name'=>'php','num'=>3],     ['id'=>2,'name'=>'js','num'=>1],     ['id'=>1,'name'=>'php','num'=>2],     ['id'=>3,'name'=>'python','num'=>2], ];//怎麼對id相同的對num求和並去重，返回的結果為 $arr=[     ['id'=>1,'name'=>'php','num'=>5],     ['id'=>2,'name'=>'js','num'=>1],     ['id'=>3,'name'=>'python','num'=>2], ];

回複內容：

 $arr=[     ['id'=>1,'name'=>'php','num'=>3],     ['id'=>2,'name'=>'js','num'=>1],     ['id'=>1,'name'=>'php','num'=>2],     ['id'=>3,'name'=>'python','num'=>2], ];//怎麼對id相同的對num求和並去重，返回的結果為 $arr=[     ['id'=>1,'name'=>'php','num'=>5],     ['id'=>2,'name'=>'js','num'=>1],     ['id'=>3,'name'=>'python','num'=>2], ];

$result = [];foreach ($arr as $v) {    if (isset($result[$v['id']])) {        $result[$v['id']]['num'] += $v['num'];    }    else {        $result[$v['id']] = $v;    }}print_r($result);

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