PHP solution for https://www.hackerrank.com/challenges/repeated-string/

repeated-string.php

<?php

$s = 'kmretasscityylpdhuwjirnqimlkcgxubxmsxpypgzxtenweirknjtasxtvxemtwxuarabssvqdnktqadhyktagjxoanknhgilnm';
$n = 736778906400;  

echo repeatedString($s, $n);

function repeatedString($s, $n) {
    Define('CHAR', 'a');
    
    if (!gettype($n) === 'integer' || !gettype($s) === 'string' || !$s || $n <= 0) {
        return 0;
    }
    if (!strcasecmp($s, CHAR)) {
        return $n;
    }
    
    $len = strlen($s);
    
    $occurrences = substr_count($s, CHAR); 
    $occurrences *= floor($n / $len);
    $occurrences += substr_count(substr($s, 0, $n % $len), CHAR);
    
    return $occurrences;
}

?>