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  1. <?php
  2.    $len = 5;
  3.    $output = array();
  4.    for( $i = 1; $i < pow( 2, $len ); $i++ ) {
  5.       $line = array();
  6.       for( $j = 0; $j < $len; $j++ ) {
  7.          if( ( 1 << $j ) & $i ) $line[] = $j + 1;
  8.       }
  9.       $output[count($line)][] = $line;
  10.    }
  11.  
  12.    foreach( $output as $group ) {
  13.       foreach( $group as $line ) {
  14.          foreach( $line as $item ) echo "$item ";
  15.          echo "\n";
  16.       }
  17.    }
  18. ?>
Success #stdin #stdout 0.02s 20568KB
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stdin
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Standard input is empty
stdout
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1 
2 
3 
4 
5 
1 2 
1 3 
2 3 
1 4 
2 4 
3 4 
1 5 
2 5 
3 5 
4 5 
1 2 3 
1 2 4 
1 3 4 
2 3 4 
1 2 5 
1 3 5 
2 3 5 
1 4 5 
2 4 5 
3 4 5 
1 2 3 4 
1 2 3 5 
1 2 4 5 
1 3 4 5 
2 3 4 5 
1 2 3 4 5
https://ideone.com/iaguiz
http://pt.stackoverflow.com/a/34704/70
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
secret

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