Recursive infinite Classification in PHP-Find the parent column by sub-column

<?phpheader ("Content-type:text/html;charset=utf8");/* Through the sub-column to find the parent column, the range is small to large range */$area  = array (Array (' Cat _id ' =>1, ' province ' = ' Fujian ', ' parent_id ' =>0 ', Array (' cat_id ' =>2, ' province ' = ' Longyan ', ' parent_id ' =>1 ), Array (' cat_id ' =>3, ' province ' = ' Guangdong province ', ' parent_id ' =>0), array (' cat_id ' =>4, ' province ' = ' Foshan ', ' parent_id ' =>3), array (' cat_id ' =>5, ' province ' = ' Jiangxi province ', ' parent_id ' =>0), array (' cat_id ' =>6, ' province ' = ' Nanchang ', ' parent_id ' =>5), array (' cat_id ' =>7, ' province ' = ' Ganzhou ', ' parent_id ' =>5), array (' cat_id ' = = 8, ' province ' = ' Ningdou County ', ' parent_id ' =>7), Function son ($arr, $cat _id) {static  $list; foreach ($arr  as  $v) {if ($v [' cat_id '] ==  $cat _id) {print_r ($v); $list [] = $v; son ($arr, $v [' parent_id ']) ;}} return  $list;} $list  = son ($area, 8), foreach ($list  as  $v) {echo  '---> ', $v [' Province '];} /** Execution Result source code     Array     (         [cat_id] => 8        [province] =>  Ningdou County          [parent_id] => 7    )      Array     (        [cat_id] => 7         [province] =>  Ganzhou          [parent_id] => 5    )     Array      (        [cat_id] => 5         [province] =>  Jiangxi Province          [parent_id] => 0    )     ---> Ningdou County---> Ganzhou--- > **/?>, Jiangxi Province

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Recursive infinite Classification in PHP-Find the parent column by sub-column