Loop with - and number in PHP

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PHP

Hi guys , i have this code .

<?php
echo "<br>";
$start = 1;
$angka = $_POST[angka];
$a = $angka;
for($i=$start; $i<=$angka; $i++) {
for($j=$start;$j<=$angka;$j=$j+2){
echo $i;
if($j < $angka) echo $a;
}
$a--;
echo '<br>';
}
?>

This is not my expecting result .
First i want the result like this .

-2-4-
1-3-5
-2-4-
1-3-5
-2-4-

The rule is Number of rows and columns follow the number of numbers declared.If the declaration of the number 5, then the results will be displayed are 5 rows and 5 columns like the example above.

What I have tried:

I tried to googling , and ask other forum.