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Manual do PHP
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Verificação de tipo de caractere
Introdução
Instalação/Configuração
Dependências
Instalação
Configurações em Execução
Tipos de Recurso
Constantes pré-definidas
Funções da Ctype
ctype_alnum
— Verifica se os caracteres são alfanuméricos
ctype_alpha
— Verifica se os caracteres são alfabéticos
ctype_cntrl
— Verifica se os caracteres são de controle
ctype_digit
— Verifica se os caracteres são numéricos
ctype_graph
— Verifica se os caracteres são imprimíveis exceto espaço
ctype_lower
— Verifica se os caracteres estão minúsculos
ctype_print
— Verifica se os caracteres são imprimíveis
ctype_punct
— Verifica se é um caractere imprimível que não é whitespace ou alfanumério
ctype_space
— Verifica se os caracteres são whitespace
ctype_upper
— Verifica se os caracteres são maiúsculos
ctype_xdigit
— Verifica se os caracteres representam um dígito hexadecimal
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