https://www.php.net/manual/uk/function.ctype-digit.php
Check for numeric character(s)
phpctypedigitmanual
https://www.php.net/manual/tr/ffi-ctype.getfuncparametercount.php
Retrieve the count of parameters of a function type
phpffictypemanual
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https://www.php.net/manual/it/function.ctype-digit.php
Controlla i caratteri numerici
phpctypedigitmanual
https://www.php.net/manual/pt_BR/ffi-ctype.getstructfieldoffset.php
phpffictypemanual
https://www.php.net/manual/en/function.ctype-lower.php
Check for lowercase character(s)
phpctypelowermanual
https://www.php.net/manual/uk/function.ctype-xdigit.php
Check for character(s) representing a hexadecimal digit
phpctypemanual