ctype() functions to check data

ctype_alnum()Checking alphanumeric characters
ctype_alpha()Checking for alphabetic characters
ctype_xdigit()Checking for hexadecimal characters and digits
ctype_cntrl()Checking for control characters
ctype_digit()Checking for numeric characters
ctype_graph()Checking for any printable characters except space
ctype_lower()Checking for all lower case characters
ctype_print()Checking for all printable characters
ctype_punct()Checking for all punctuation characters
ctype_space()Checking for all whitespace character(s)
ctype_upper()Checking for all upper case characters

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