https://www.php.net/manual/en/ref.strings.php
PHP: String Functions - Manual
php string functionsmanual
https://www.codecademy.com/resources/docs/php/string-functions/str-repeat
PHP | String Functions | str_repeat() | Codecademy
Returns a string that repeats a substring a specified number of times.
php string functionsrepeatcodecademy
https://www.tpointtech.com/php-string-functions
PHP String Functions - Tpoint Tech
PHP string functions allow text manipulation, which is generally referred to as "strings".
php string functionstpointtech