Retrieve single variable from a function

[phppup]

how can I retrieve the single variable that I want from the function?

A similar example for what I'm attempting to accomplish

$seq="";
function doThis($num=4){
for($i=0; $i<$num; $i++){
   echo $i."<br>";
    $seq .= $i;
   }
echo $seq;
}
                   
doThis();
                   
echo $seq;  //get variable here

How can I access the variable that is created inside the function, and use it on the outside?

[Barand]

Return the value from the function

 

https://www.php.net/manual/en/functions.returning-values.php

[benanamen]

<?php

function doThis($num = 4)
{
    for ($i = 0; $i < $num; $i++) {
        $seq[] = $i;
    }
    return $seq;
}

$arr = doThis();

echo $arr[1];
echo $arr[2];
echo $arr[3];