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@ 2018-12-17T07:17:41Z

<?php
$list = [
0 =>[
    'nickname' => 'Bob',
    'phone' => 15295892895,
    'is_group' => 1,
    'created_at' => 1544944181,
    'assemble_id' => 'c1d0zUbmP',
    'status' => 1
],
1 =>[
    'nickname' => 'Jack',
    'phone' => 15295892895,
    'is_group' => 1,
    'created_at' => 1544944181,
    'assemble_id' => 'ED6OJX4VV',
    'status' => 1
],
2 =>[
    'nickname' => 'Grace',
    'phone' => 15295892895,
    'is_group' => 0,
    'created_at' => 1544944181,
    'assemble_id' => 'c1d0zUbmP',
    'status' => 1
],
3 =>[
    'nickname' => 'Jelly',
    'phone' => 15295892895,
    'is_group' => 0,
    'created_at' => 1544944181,
    'assemble_id' => 'ED6OJX4VV',
    'status' => 1
]
];

foreach ($list as $row) {
        $result[$row['assemble_id']]['assemble_id'] = $row['assemble_id'];
        $result[$row['assemble_id']]['assemble_group'][] = [
            'nickname' => $row['nickname'],
            'phone' => $row['phone'],
            'is_group' => $row['is_group'],
            'created_at' => $row['created_at'],
            'assemble_id' => $row['assemble_id'],
            'status' => $row['status']
        ];
}
var_export(array_values($result));

Output for 5.6.38, 7.0.33, 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.31, 8.2.0 - 8.2.27, 8.3.0 - 8.3.15, 8.4.1 - 8.4.2: array ( 0 => array ( 'assemble_id' => 'c1d0zUbmP', 'assemble_group' => array ( 0 => array ( 'nickname' => 'Bob', 'phone' => 15295892895, 'is_group' => 1, 'created_at' => 1544944181, 'assemble_id' => 'c1d0zUbmP', 'status' => 1, ), 1 => array ( 'nickname' => 'Grace', 'phone' => 15295892895, 'is_group' => 0, 'created_at' => 1544944181, 'assemble_id' => 'c1d0zUbmP', 'status' => 1, ), ), ), 1 => array ( 'assemble_id' => 'ED6OJX4VV', 'assemble_group' => array ( 0 => array ( 'nickname' => 'Jack', 'phone' => 15295892895, 'is_group' => 1, 'created_at' => 1544944181, 'assemble_id' => 'ED6OJX4VV', 'status' => 1, ), 1 => array ( 'nickname' => 'Jelly', 'phone' => 15295892895, 'is_group' => 0, 'created_at' => 1544944181, 'assemble_id' => 'ED6OJX4VV', 'status' => 1, ), ), ), )

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