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PHP > vérifier des données
ctype_alnum()
check all characters of given string/text are alphanumeric or not. If all characters are alphanumeric then return TRUE, otherwise return FALSE.
bool ctype_alnum ($text)
Geeks // true %%%Contribute_article on GFG!!! // false geek@gmail.com // false 2018 // true GFG2018 // true a b c // false @!$%^&*()|2018' // false