https://perldoc.perl.org/5.22.3/functions/lcfirst
lcfirst - Perldoc Browser
browser
https://perldoc.perl.org/5.16.0/functions/lcfirst
lcfirst - Perldoc Browser
browser
https://perldoc.perl.org/5.41.8/functions/lcfirst
lcfirst - Perldoc Browser
browser
https://perldoc.perl.org/5.43.9/functions/lcfirst
lcfirst - Perldoc Browser
browser
https://www.php.net/manual/ja/function.lcfirst.php
PHP: lcfirst - Manual
phpmanual
https://www.php.net/manual/ja/function.mb-lcfirst.php
PHP: mb_lcfirst - Manual
phpmbmanual