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<?php function replaceParent(&$array, $parent = null) { foreach ($array as &$item) { if ($item['id'] == $parent) { if ($item['parent']) { return replaceParent($array, $item['parent']); } else { return $item['id']; } } elseif ($item['parent']) { $item['parent'] = replaceParent($array, $item['parent']); } } } $array = [ '0' => [ 'id' => 1, 'parent' => 0, 'name' => 'root 0' ], '1' => [ 'id' => 2, 'parent' => 1, 'name' => 'root 1' ], '2' => [ 'id' => 3, 'parent' => 2, 'name' => 'root 2' ], '3' => [ 'id' => 4, 'parent' => 3, 'name' => 'root 3' ], '4' => [ 'id' => 5, 'parent' => 3, 'name' => 'root 4' ], '5' => [ 'id' => 6, 'parent' => 2, 'name' => 'root 2' ] ]; replaceParent($array); var_export($array);
Output for 7.1.25 - 7.1.32, 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 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.4, 8.3.6 - 8.3.7
array ( 0 => array ( 'id' => 1, 'parent' => 0, 'name' => 'root 0', ), 1 => array ( 'id' => 2, 'parent' => 1, 'name' => 'root 1', ), 2 => array ( 'id' => 3, 'parent' => 1, 'name' => 'root 2', ), 3 => array ( 'id' => 4, 'parent' => 1, 'name' => 'root 3', ), 4 => array ( 'id' => 5, 'parent' => 1, 'name' => 'root 4', ), 5 => array ( 'id' => 6, 'parent' => 1, 'name' => 'root 2', ), )
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 array ( 0 => array ( 'id' => 1, 'parent' => 0, 'name' => 'root 0', ), 1 => array ( 'id' => 2, 'parent' => 1, 'name' => 'root 1', ), 2 => array ( 'id' => 3, 'parent' => 1, 'name' => 'root 2', ), 3 => array ( 'id' => 4, 'parent' => 1, 'name' => 'root 3', ), 4 => array ( 'id' => 5, 'parent' => 1, 'name' => 'root 4', ), 5 => array ( 'id' => 6, 'parent' => 1, 'name' => 'root 2', ), )

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