[Solved] What can I do to get this function to output?

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What do I need to do to get output from this function?

Just call the function:

function recursion($a)
{
    if ($a < 20) {
        echo "$a";
        recursion($a + 1);
    }
}

recursion(1); // <--- here

Defining a function only defines it, not execute it. To execute a function you have to call it.

solved What can I do to get this function to output?