PHP ctype functions to check input string or data

PHP ctype character checks

The ctype extension provides focused checks for strings made entirely of digits, letters, hexadecimal characters, whitespace, punctuation, printable characters, and related character classes. Pass strings explicitly in modern PHP.

$value = 'AB12';
var_dump(ctype_alnum($value));
var_dump(ctype_alpha($value));
var_dump(ctype_digit($value));

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

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Subhendu Mohapatra

Author & Instructor at plus2net

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

PHP ctype character checks

Subhendu Mohapatra