Question

How to print numbers in left right right left pattern with PHP

Answer 1

$rows = 13;
$line_number = 1;
      
for ($i = 1; $i <= $rows * 2; $i += 2) {
    if ($line_number % 2 == 1) {
        echo $i . " " . ($i + 1);
    } else {
        echo ($i + 1) . " " . $i;
    }
    $line_number++;
    echo "\n";
}
 
 
 
 
/*
run:
  
1 2
4 3
5 6
8 7
9 10
12 11
13 14
16 15
17 18
20 19
21 22
24 23
25 26
  
*/

 

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