PHP Riddle. The function of the pyramid [closed]

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I have a riddle for you.

I need a function that displays the number of pyramid structures.

Example: echo getNumber(7)

Output: 12345677654321

In this case, do not use outside functions and operators.

From the mathematical symbols use only addition. Dont use for/while/implode/range/count.

Maximum use of one condition.

Good luck!

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The answer to your assignment IS RECURSION.

Take a look, and good luck.

I do not want to give you the answer as others take shame upon that. But here is an example of how you would get 7654321 with a recursive function.

function getNumbers(int val) {

if val != 0
{
    echo val;
    val = val -1;
    getNumbers(val)
}


}