<?php
$arr = array(
array("userId"=>1,"name"=>"A","content" => "I'm A"),
array("userId"=>2,"name"=>"Jasonote","content" => "I'm Jasonote"),
array("userId"=>3,"name"=>"B","content" => "I'm B"),
array("userId"=>1,"name"=>"A","content" => "I'm A"),
array("userId"=>2,"name"=>"Jasonote","content" => "I'm Jasonote"),
array("userId"=>2,"name"=>"Jasonote","content" => "I'm Jasonote"),
array("userId"=>2,"name"=>"Jasonote","content" => "I'm Jasonote"),
array("userId"=>4,"name"=>"C","content" => "I'm C"),
);
$result = [];
$up = '';
$i = 0;
foreach ($arr as $k => $v) {
$t = $v['userId'];
if ($k < 1) {
$result[$i][] = $v;
$up = $t;
$i++;
}else{
if ($t == $up) {
$result[$i][] = $v;
}else{
$i++;
$result[$i][] = $v;
}
$up = $t;
}
}
echo json_encode(array_values($result));
[
[
{
"userId":1,
"name":"A",
"content":"I'm A"
}
],
[
{
"userId":2,
"name":"Jasonote",
"content":"I'm Jasonote"
}
],
[
{
"userId":3,
"name":"B",
"content":"I'm B"
}
],
[
{
"userId":1,
"name":"A",
"content":"I'm A"
}
],
[
{
"userId":2,
"name":"Jasonote",
"content":"I'm Jasonote"
},
{
"userId":2,
"name":"Jasonote",
"content":"I'm Jasonote"
},
{
"userId":2,
"name":"Jasonote",
"content":"I'm Jasonote"
}
],
[
{
"userId":4,
"name":"C",
"content":"I'm C"
}
]
]