Reverse string without strrev

Question

Some time ago during a job interview I got the task to reverse a string in PHP without using strrev.

My first solution was something like this:

Answer 1

This is my solution to solve this.

$in = 'This is a test text';
$out = '';
// find string length
$len = strlen($in);

// loop through it and print  it reverse
for ( $i = $len - 1; $i >=0;$i-- )
{
    $out = $out.$in[$i];
 }

echo $out;