How to turn one-dimensional data into multidimensional in PHP

Today in the forum to see a friend's needs, witness CSDN moderators are worthy of Daniel's role exists AH!!! Save it for later use when needed.

String is:

1 = Photoelectric mouse  
2 = mechanical mouse  
3 = no mouse  
1.1 = Black Photoelectric mouse  
1.2 = Red Photoelectric mouse  
1.2.1 = bluetooth Red optical Mouse

Moderator answers for:

<?php
$s =<<< TXT  
1 = Optical Mouse  
2 = mechanical mouse  
3 = no mouse  
1.1 = Black Photoelectric mouse  
1.2 = Red Photoelectric mouse  
1.2.1 = Bluetooth Red optical mouse  
TXT;  
       
$res = Array ();  
foreach (Preg_split ("/[\r\n]+/", $s) as $r) {  
  list ($k, $txt) = explode (' = ', $r);  
  $p =& $res;  
  foreach (Explode ('. ', $k) as $v) {  
    if (! isset ($p [$v])) $p [$v] = array (' txt ' => $txt, ' child ' => Array ());  
    $p =& $p [$v] [' child ']  
  ;  
}  
       
Print_r ($res);  
? >

The printed array is:

Array ([1] => array ([txt] => optical mouse [child] => array   
                            ([1] => Array ([txt] => black Optical Mouse   
       
                        [Child] => Array ()  
                            ) [2] => Array (  
                                [TXT] => red optical Mouse [child] => Array  
                                            ([1] => Array (  
                                                [txt] => bluetooth red Optical Mouse [child] => Array  
       
                                        (  
                                                )  )
       
                                )  
       
                        )  
       
                )  
                ) [2] => array ([TXT] => mechanical mouse [child] => array   
            ()) [3] => Array ([txt] => no mouse [Child] => Array ())

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