Add x in between the number

Question

I have list of numbers

1112
1113
1114
1115
1116-1117
1118-1119
1120
1121-1122

Need to show these numbers like following

1x112
1x113
1x114
1x115
1x120

And these number explode with - and show like

1x116
1x117
1x118
1x119
1x121
1x122

Answer 1

Try with convert into array like this.

<?php 
$a = array();
$a[] = 1112;
$a[] = 1113;
$a[] = 1114;
$a[] = 1115;
$a[] = '1116-1117';
$a[] = '1118-1119';
$a[] = 1120;
$a[] = '1121-1122';

$output = array();
foreach($a as $key=>$value){
    if (strpos($value, '-') !== false) {
        $sub_a = explode('-',$value);
        foreach($sub_a as $sub_key=>$sub_value){
            $output[$key][$sub_key] = substr($sub_value, 0, 1).'x'.substr($sub_value, 1);       
        }
    }else{
        $output[$key] = substr($value, 0, 1).'x'.substr($value, 1);
    }
}
print_r($output);

Output

Array
(
    [0] => 1x112
    [1] => 1x113
    [2] => 1x114
    [3] => 1x115
    [4] => Array
        (
            [0] => 1x116
            [1] => 1x117
        )

    [5] => Array
        (
            [0] => 1x118
            [1] => 1x119
        )

    [6] => 1x120
    [7] => Array
        (
            [0] => 1x121
            [1] => 1x122
        )

)