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@ 2024-02-10T07:34:58Z

<?php

$array = [
    [
        'case_code_id' => 1,
        'parent_id' => 0,
        'case_code' => 'Main A',
        'sub_codes' => [
            [
                'case_code_id' => 3,
                'parent_id' => 1,
                'case_code' => 'Sub A',
                'sub_codes' => [
                    [
                        'case_code_id' => 5,
                        'parent_id' => 3,
                        'case_code' => 'Sub Sub A',
                        'sub_codes' => []
                    ]
                ]
            ],
            [
                'case_code_id' => 4,
                'parent_id' => 1,
                'case_code' => 'Sub B',
                'sub_codes' => []
            ]
        ]
    ],
    [
        'case_code_id' => 2,
        'parent_id' => 0,
        'case_code' => 'Main B',
        'sub_codes' => []
    ]
];

function flatten(array $array): array
{
    $result = [];
    foreach ($array as $v) {
        $subCode = $v['sub_codes'];
        unset($v['sub_codes']);
        array_push(
            $result,
            $v,
            ...flatten($subCode)
        );
        
    }
    return $result;
}

var_export(flatten($array));

Output for 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3: array ( 0 => array ( 'case_code_id' => 1, 'parent_id' => 0, 'case_code' => 'Main A', ), 1 => array ( 'case_code_id' => 3, 'parent_id' => 1, 'case_code' => 'Sub A', ), 2 => array ( 'case_code_id' => 5, 'parent_id' => 3, 'case_code' => 'Sub Sub A', ), 3 => array ( 'case_code_id' => 4, 'parent_id' => 1, 'case_code' => 'Sub B', ), 4 => array ( 'case_code_id' => 2, 'parent_id' => 0, 'case_code' => 'Main B', ), )

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