Ctype
Class: Ctype implementation through regex.
Source: vendor/symfony/polyfill-ctype/Ctype.php:21
Ctype::ctype_alnum()
Method: Returns TRUE if every character in text is either a letter or a digit, FALSE otherwise.
Source: vendor/symfony/polyfill-ctype/Ctype.php:32
Ctype::ctype_alpha()
Method: Returns TRUE if every character in text is a letter, FALSE otherwise.
Source: vendor/symfony/polyfill-ctype/Ctype.php:48