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@ 2019-12-23T13:38:24Z

<?php
$data = [ 
 
    0 => [ 
         "category_id" => 20,
        "category_name" => "Category 1" ,
        "sub_categories" => [
                0 => [
                        "category_id" => 25,
                        "category_name" => "Category 1.1", 
                        "sub_categories" => ''
                    ],
                1=> [
                        "category_id" => 26,
                        "category_name" => "Category 1.2", 
                        "sub_categories" => ''
                    ],
                2 => [
                        "category_id" => 27,
                        "category_name" => "Category 1.3", 
                        "sub_categories" => [
                            0 => [
                                    "category_id" => 31,
                                    "category_name" => "Category 2.1", 
                                    "sub_categories" => ''
                                ],
                            1=> [
                                    "category_id" => 32,
                                    "category_name" => "Category 2.2", 
                                    "sub_categories" => ''
                                ],
                        ]
                    ],
  
        ]
    ],
    
    1=> [
        "category_id" => 21,
        "category_name" => "Category 2", 
        "sub_categories" => ''
    ],
];

function getCats($data, array &$ar, $res = ''){ 
    foreach($data as $arr){ 
        
        $res_new = ''; 
        $res_new .= $arr['category_name'] && $res ? $res.' -> '.$arr['category_name'] : $arr['category_name']; 
        
        $ar[] = ["category_id"=>$arr['category_id'], "category_name"=>$res_new, ];
       // echo $res_new.PHP_EOL; 
       // echo .PHP_EOL; 
         
        if(is_array($arr['sub_categories'])){  
            if (count($arr['sub_categories'])>0){  
                getCats($arr['sub_categories'], $ar, $res_new);
            }   
        }  
    }
}
   $ares = [];
   getCats($data,$ares);
   print_r($ares);

Output for 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 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.4.16, 8.5.0 - 8.5.1: Array ( [0] => Array ( [category_id] => 20 [category_name] => Category 1 ) [1] => Array ( [category_id] => 25 [category_name] => Category 1 -> Category 1.1 ) [2] => Array ( [category_id] => 26 [category_name] => Category 1 -> Category 1.2 ) [3] => Array ( [category_id] => 27 [category_name] => Category 1 -> Category 1.3 ) [4] => Array ( [category_id] => 31 [category_name] => Category 1 -> Category 1.3 -> Category 2.1 ) [5] => Array ( [category_id] => 32 [category_name] => Category 1 -> Category 1.3 -> Category 2.2 ) [6] => Array ( [category_id] => 21 [category_name] => Category 2 ) )
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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