PHP ctype functions to check input string or data

The ctype extension in PHP provides a set of functions for character type checking. It allow to determine the type of characters in a string, such as whether they are alphanumeric, alphabetic, numeric, or part of a specific character class.

Function	Details
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

Checking User input through web Form

Subhendu Mohapatra

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I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.

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ctype() : Checking type of string

Subhendu Mohapatra