I’m working on a PHP function called cascade that accepts a string and an integer representing the gap between words. The function should return the text arranged in a cascading representation.

For example, if the function is called like this:

cascade("The codings bug", 2);

t should return:

T__c__b___
_h__o__u__
__e__d__g_
______i___
_______n__
________g_
_________s

Another example:

cascade("The coding bug", 3);

Should return:

T___c___b__
_h___o___u_
__e___d___g
_______i___
________n__
_________g_

Here is the current code I have written

function cascade(string $s, int $gap): string {
    $lines = [];
    $words = explode(' ', $s);
    
    foreach ($words as $word) {
        $line = "";
        for ($i = 0; $i < strlen($word); $i++) {
            $line .= str_repeat('_', $gap * $i) . $word[$i] . PHP_EOL;
        }
        $lines[] = trim($line); // Remove the trailing newline character
    }
    
    return implode(PHP_EOL, $lines);
}

When I ran cascade(‘The codings bug’, 2), I got the following result:

T __h ____e c __o ____d ______i ________n __________g ____________s b __u ____g