数组根据下标进行归类
$a = [
['id'=>1,'title'=>'星期二的早晨','author'=>'张三','date'=>'2021-6-1'],
['id'=>2,'title'=>'星期三的早晨','author'=>'李四','date'=>'2021-6-1'],
['id'=>3,'title'=>'星期四的早晨','author'=>'王五','date'=>'2021-6-2']
];
$arr = [];
foreach ($a as $v){
$arr[$v['date']] = [
'date'=>$v['date'],
'articles'=>[]
];
}
foreach ($a as $v){
$arr[$v['date']]['articles'][] = $v;
}
return json($arr);
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