代码

<?php

public  function  index()
{
    $users =  collect([
        collect(['name' => '张三']),
        collect(['name' => '李四']),
        ['name' => '王五']
    ]);

    $users->map(function  ($item,  $key)  {
        $item['name']  .=  'xxxx';
    });

    dd($users,  $new_users);
 }

运行结果（图片传不上来了。。。）

Illuminate\Support\Collection {#388 ▼
  #items: array:3 [▼
    0 => Illuminate\Support\Collection {#424 ▼
      #items: array:1 [▼
        "name" => "张三xxxx"
      ]
      #escapeWhenCastingToString: false
    }
    1 => Illuminate\Support\Collection {#425 ▼
      #items: array:1 [▼
        "name" => "李四xxxx"
      ]
      #escapeWhenCastingToString: false
    }
    2 => array:1 [▼
      "name" => "王五"
    ]
  ]
  #escapeWhenCastingToString: false
}