php - for loop inside a while loop, correct syntax?

Question

I have this loop

while (count($arr) < 7)
        {

            $string = 'xx';
            for ($i=0; strlen($string) < 4; $i++)
            {
                $string = $string.'1';
            }
            echo "<br>array length is less than 7, word $string is created.";
            $arr[] = $string;
        }

Every time I run this part of the code, my xampp local server would time out and gives the server not found error.

I have found that if I delete the inner for loop, it would run fine. Is there anything wrong with putting the for loop inside the while loop?

Also, my conditional statement strlen($string) < 4 in the for loop does not have any reference to the $i variable, but I don't see any thing not logical of having a conditional statement not related to the counter. Am I wrong, does it require some sort of comparison against the counter?

TIA

Answer 1

Nothing wrong with having a for inside a while.

Your "for" would be better a bit clearer as

while(strlen($string) < 4) {
    $string = $string.'1';
}

Answer 2

I don't see any issues whatsoever with your php.

I copied your code exactly and there was no infinite loop at all.

The result I got was as follows:

<br>array length is less than 7, word xx11 is created.
<br>array length is less than 7, word xx11 is created.
<br>array length is less than 7, word xx11 is created.
<br>array length is less than 7, word xx11 is created.
<br>array length is less than 7, word xx11 is created.
<br>array length is less than 7, word xx11 is created.
<br>array length is less than 7, word xx11 is created.

My only suggestion would be to change:

$string = $string.'1';

to

$string .= '1';