Example: Print Star Pattern without using loop in PHP

C
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Java
Python
PHP

<?php
// Print Star Pattern without using loop in PHP

// It's the number of rows
$x = 10;

// This will print the pattern
starPattern($x);

// It's the recursive function
// to print the star pattern
function starPattern($n, $i = 1, $r = 1) {
    if ((int)sqrt(pow(($i - (2 * $n - 1) * ($r - 1) - $n) , 2)) < $r)
    	echo "*";
    else
    	echo " ";

    if (($i - (2 * $n - 1) * ($r - 1)) % (2 * $n - 1) == 0) {
        echo "\n";
        $r++;
    }

    if ($i++ < $n * (2 * $n - 1)) starPattern($n, $i, $r);
}

?>