ctype_punct - PHP code example

PHP Function Ctype Punct

If you are a developer then you might have heard of the ctype functions. These are functions that check whether the characters in a string fall into particular classes. Unlike their C counterparts (don't be confused, these have nothing to do with Python's ctypes library) they are a part of the PHP standard.

For example the ctype_alpha() function returns true only if the given string only contains small or capital letters from A to Z. The ctype_digit() function only returns true if the string consists of digits 0 to 9. If you use ctype_punct() then it will only return true if all the characters in the given string are punctuation symbols (dot, comma, question mark, asterisk, exclamation mark and so on).

In this article we'll see some examples of ctype_punct() in action and how we can use this function in our code. The ctype_punct() function is an inbuilt function and is available for all PHP versions.

The function is very easy to use and works well in most cases, however, some hosting providers might disable this function as they don't want you to know that they are using an older version of php. In that case you will receive a fatal error notification such as "Uncaught Error: Call to undefined function ctype_punct()". You should then contact your host and ask them to enable this function for you. They should be able to do that pretty quickly.

ctype_punct example

if (!function_exists('ctype_graph')) {
    function ctype_graph(mixed $text): bool { return p\Ctype::ctype_graph($text); }
}
if (!function_exists('ctype_lower')) {
    function ctype_lower(mixed $text): bool { return p\Ctype::ctype_lower($text); }
}
if (!function_exists('ctype_print')) {
    function ctype_print(mixed $text): bool { return p\Ctype::ctype_print($text); }
}
if (!function_exists('ctype_punct')) {
    function ctype_punct(mixed $text): bool { return p\Ctype::ctype_punct($text); }
}
if (!function_exists('ctype_space')) {
    function ctype_space(mixed $text): bool { return p\Ctype::ctype_space($text); }
}
if (!function_exists('ctype_upper')) {
    function ctype_upper(mixed $text): bool { return p\Ctype::ctype_upper($text); }
}
if (!function_exists('ctype_xdigit')) {
    function ctype_xdigit(mixed $text): bool { return p\Ctype::ctype_xdigit($text); }
}

if (!function_exists('ctype_graph')) {
    function ctype_graph($text) { return p\Ctype::ctype_graph($text); }
}
if (!function_exists('ctype_lower')) {
    function ctype_lower($text) { return p\Ctype::ctype_lower($text); }
}
if (!function_exists('ctype_print')) {
    function ctype_print($text) { return p\Ctype::ctype_print($text); }
}
if (!function_exists('ctype_punct')) {
    function ctype_punct($text) { return p\Ctype::ctype_punct($text); }
}
if (!function_exists('ctype_space')) {
    function ctype_space($text) { return p\Ctype::ctype_space($text); }
}
if (!function_exists('ctype_upper')) {
    function ctype_upper($text) { return p\Ctype::ctype_upper($text); }
}
if (!function_exists('ctype_xdigit')) {
    function ctype_xdigit($text) { return p\Ctype::ctype_xdigit($text); }
}