https://www.codecademy.com/resources/docs/php/string-functions/strtolower
PHP | String Functions | strtolower() | Codecademy
Converts all characters in a given string to lowercase format.
php stringfunctionsstrtolowercodecademy
https://www.php.net/manual/en/function.strtolower.php
PHP: strtolower - Manual
Make a string lowercase
phpstrtolowermanual
https://question2answer.org/qa/90710/php-strtolower-using
php strtolower using? - Question2Answer Q&A
how can i use strtolower function?
phpstrtolowerusingq
https://www.php.net/mb_strtolower
PHP: mb_strtolower - Manual
Make a string lowercase
phpmbstrtolowermanual