Laravel系列定制

Question

Given array like this, I want to arrange data in a custom way.

array:5 [
      0 => array:4 [
        "message" => "Message number 1 for first conversation"
        "is_seen" => 0
        "user_id" => 2
        "sent_time" => "2017-08-30 23:28:50"
      ]
      1 => array:4 [
        "message" => "Message number 2 for first conversation"
        "is_seen" => 1
        "user_id" => 1
        "sent_time" => "2017-08-29 23:36:27"
      ]
      2 => array:4 [
        "message" => "Message number 3 for first conversation"
        "is_seen" => 1
        "user_id" => 1
        "sent_time" => "2017-08-29 23:36:27"
      ]
      3 => array:4 [
        "message" => "Message number 4 for first conversation by second user"
        "is_seen" => 1
        "user_id" => 2
        "sent_time" => "2017-08-29 23:36:27"
      ]
      4 => array:4 [
        "message" => "Message number 5 for first conversation by second user"
        "is_seen" => 1
        "user_id" => 2
        "sent_time" => "2017-08-29 23:36:27"
      ]
    ]

What I want to do is to group messages that are sent by the same user so I get an array like this :

$data = [
    "block" => [
        [
            "message" => "Message number 1 for first conversation",
            "is_seen" => 0,
            "user_id" => 2,
            "sent_time" => "2017-08-30 23:28:50"
        ]
    ],
    "block" => [
        [
            "message" => "Message number 2 for first conversation",
            "is_seen" => 1,
            "user_id" => 1,
            "sent_time" => "2017-08-29 23:36:27"
        ],
        [
            "message" => "Message number 3 for first conversation",
            "is_seen" => 1,
            "user_id" => 1,
            "sent_time" => "2017-08-29 23:36:27"
        ]
    ],
   "block" => [
        [
            "message" => "Message number 4 for first conversation by second user",
            "is_seen" => 1,
            "user_id" => 2,
            "sent_time" => "2017-08-29 23:36:27"
        ],
        [
            "message" => "Message number 5 for first conversation by second user",
            "is_seen" => 1,
            "user_id" => 2,
            "sent_time" => "2017-08-29 23:36:27"
        ]
    ]
];

So basically, If next message user_id is same as previous message user_id add it to group array. If it is not, create new group array and so on. I do not want to group all user messages together since this structure is required for pagination in front-end.

Answer 1

You can do it like this

 $new = array();
 $prev = "";
 $count =0;
 foreach($arr as $key=> $value){
    if($prev == $value["user_id"]){
      $new[$count-1][] = $value;
    }else {
      $new[$count][] = $value;
      $count++;
    }$prev = $value["user_id"];
}
print_r($new);

Live demo : https://eval.in/854288