fork download
copy 
  1. <?php
  2.  
  3. $filename = [
  4.     2 => '1_1_page2-img1.jpg',
  5.     3 => '1_2_page2-img1-big.jpg',
  6.     4 => '2_1_page2-img1.jpg',
  7.     5 => '2_2_page2-img1-big.jpg',
  8.     6 => '3_1_page2-img1.jpg',
  9.     7 => '4_1_page2-img1.jpg',
  10.     8 => '4_2_page2-img1.jpg',
  11.     9 => '5_2_page2-img1.jpg'
  12. ];
  13.  
  14. $array = [];
  15.  
  16. foreach ($filename as $file) {
  17.     $fields = explode('_', $file);
  18.     $array[$fields[0]][$fields[1]] = $file;
  19. }
  20.  
  21. var_dump($array);
Success #stdin #stdout 0.02s 24400KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
array(5) {
  [1]=>
  array(2) {
    [1]=>
    string(18) "1_1_page2-img1.jpg"
    [2]=>
    string(22) "1_2_page2-img1-big.jpg"
  }
  [2]=>
  array(2) {
    [1]=>
    string(18) "2_1_page2-img1.jpg"
    [2]=>
    string(22) "2_2_page2-img1-big.jpg"
  }
  [3]=>
  array(1) {
    [1]=>
    string(18) "3_1_page2-img1.jpg"
  }
  [4]=>
  array(2) {
    [1]=>
    string(18) "4_1_page2-img1.jpg"
    [2]=>
    string(18) "4_2_page2-img1.jpg"
  }
  [5]=>
  array(1) {
    [2]=>
    string(18) "5_2_page2-img1.jpg"
  }
}
https://ideone.com/fEHGEi
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
secret

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!