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  1. <?php
  2.  
  3. $fruits = array(
  4.     'mango',
  5.     'mango red',
  6.     'mango yellow',
  7.     'orange',
  8.     'banana',
  9.     'apple',
  10.     'apple red',
  11.     'apple green',
  12. );
  13.  
  14. $result = array();
  15. foreach ($fruits as $f) {
  16.     $f_array = explode(' ', $f);
  17.     $start = &$result;
  18.     foreach ($f_array as $word) {
  19.         if (!isset($start[$word])) {
  20.             $start[$word] = array();
  21.         }
  22.         $start = &$start[$word];
  23.     }
  24. }
  25. var_dump($result);
Success #stdin #stdout 0.01s 82880KB
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array(4) {
  ["mango"]=>
  array(2) {
    ["red"]=>
    array(0) {
    }
    ["yellow"]=>
    array(0) {
    }
  }
  ["orange"]=>
  array(0) {
  }
  ["banana"]=>
  array(0) {
  }
  ["apple"]=>
  array(2) {
    ["red"]=>
    array(0) {
    }
    ["green"]=>
    &array(0) {
    }
  }
}
https://ideone.com/vwY5Lf
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
public

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