Online PHP editor | output for uEfh6

@ 2017-12-03T12:12:13Z

<?php

    $in = array('e1','e2','e3','e4');
    
    //$new =[];
    $count = count($in);
    Foreach($in as $key => $val){
        $new[] = $val; // add first value
        
        // loop through in to greate the long incrementing string
        For($i=$key; $i<=$count-$key;$i++){
            if($key != 0){
                 $new[] = implode("-",array_slice($in,$key,$i));
            }else{
                if($i - $key>1) $new[] = implode("-",array_slice($in,$key,$i));
            }
        }
        
        // all but second to last except if iteration has come to far
        if($count-2-$key >1) $new[] = Implode("-",Array_slice($in,$key,$count-2)). "-". $in[$count-1];
    
        // $key (skip one) next one. except if iteration has come to far
        If($count-2-$key >1) $new[] = $in[$key] . "-" . $in[$key+2];
    
        // $key (skip one) rest of array except if iteration has come to far
        if($count-2-$key > 1) $new[] = $in[$key] ."-". Implode("-",Array_slice($in,$key+2));
    
        // $key and last item, except if iteration has come to far
        if($count-1 - $key >1) $new[] = $in[$key] ."-". $in[$count-1];
    
    }
    
    
    $new = array_unique($new); // remove any duplicates that may have been created
$result = array(
    0 => 'e1',
    1 => 'e1-e2',
    2 => 'e1-e2-e3',
    3 => 'e1-e2-e3-e4',
    4 => 'e1-e2-e4',
    5 => 'e1-e3',
    6 => 'e1-e3-e4',
    7 => 'e1-e4',
    8 => 'e2',
    9 => 'e2-e3',
   10 => 'e2-e3-e4',
   11 => 'e2-e4',
   12 => 'e3',
   13 => 'e3-e4',
   14 => 'e4'
);
var_dump(array_diff($new,$result)); // compare arrays if there is any difference
Var_dump($new, $result); // output them

Output for 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: array(0) { } array(15) { [0]=> string(2) "e1" [1]=> string(5) "e1-e2" [2]=> string(8) "e1-e2-e3" [3]=> string(11) "e1-e2-e3-e4" [4]=> string(8) "e1-e2-e4" [5]=> string(5) "e1-e3" [6]=> string(8) "e1-e3-e4" [7]=> string(5) "e1-e4" [8]=> string(2) "e2" [10]=> string(5) "e2-e3" [11]=> string(8) "e2-e3-e4" [12]=> string(5) "e2-e4" [13]=> string(2) "e3" [14]=> string(5) "e3-e4" [15]=> string(2) "e4" } array(15) { [0]=> string(2) "e1" [1]=> string(5) "e1-e2" [2]=> string(8) "e1-e2-e3" [3]=> string(11) "e1-e2-e3-e4" [4]=> string(8) "e1-e2-e4" [5]=> string(5) "e1-e3" [6]=> string(8) "e1-e3-e4" [7]=> string(5) "e1-e4" [8]=> string(2) "e2" [9]=> string(5) "e2-e3" [10]=> string(8) "e2-e3-e4" [11]=> string(5) "e2-e4" [12]=> string(2) "e3" [13]=> string(5) "e3-e4" [14]=> string(2) "e4" }
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(15) { [0]=> string(2) "e1" [1]=> string(5) "e1-e2" [2]=> string(8) "e1-e2-e3" [3]=> string(11) "e1-e2-e3-e4" [4]=> string(8) "e1-e2-e4" [5]=> string(5) "e1-e3" [6]=> string(8) "e1-e3-e4" [7]=> string(5) "e1-e4" [8]=> string(2) "e2" [10]=> string(5) "e2-e3" [11]=> string(8) "e2-e3-e4" [12]=> string(5) "e2-e4" [13]=> string(2) "e3" [14]=> string(5) "e3-e4" [15]=> string(2) "e4" } array(15) { [0]=> string(2) "e1" [1]=> string(5) "e1-e2" [2]=> string(8) "e1-e2-e3" [3]=> string(11) "e1-e2-e3-e4" [4]=> string(8) "e1-e2-e4" [5]=> string(5) "e1-e3" [6]=> string(8) "e1-e3-e4" [7]=> string(5) "e1-e4" [8]=> string(2) "e2" [9]=> string(5) "e2-e3" [10]=> string(8) "e2-e3-e4" [11]=> string(5) "e2-e4" [12]=> string(2) "e3" [13]=> string(5) "e3-e4" [14]=> string(2) "e4" }

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