ctype_graph - PHP code example

The PHP Function Ctype_Graph

PHP is a language with a lot of functionality. It comes with built-in functions that are useful for many purposes, and it supports a wide variety of extensions compiled to add even more functionality. These functions may come from the standard distribution or from an extension, and they can also be created by individual developers for use in their own projects. Functions are used to perform actions against more than one item or location in a program, and they can help developers to write modular code.

The ctype_graph extension provides a number of functions for verifying the character type of strings. These are useful for ensuring that a string contains only characters that are visually printable (that is, those that cause an output such as letters, numbers, visible dots and exclamation points) or that it does not contain control characters and other non-printable characters. Among the ctype_graph functions available are ctype_graph(), ctype_punct() and ctype_space().

Another useful feature of the ctype_graph extension is its ability to check for characters that are not printable, including those such as tabs and line breaks. This can be done with ctype_punct(), which returns false for a string that contains only tabs and other non-printable characters or ctype_space(), which checks for a string that only consists of spaces and characters that are not a space.

The ctype_graph extension also includes functions for checking for certain classes of objects. Unlike other languages such as Java, PHP does not support object-oriented programming in the same way, so any metaprogramming has to be carried out by using string names rather than class methods. For example, a class in PHP cannot have an __construct method like Python's __init__, so it can't reimplement private methods.

ctype_graph example

if (!function_exists('ctype_alpha')) {
    function ctype_alpha($text) { return p\Ctype::ctype_alpha($text); }
}
if (!function_exists('ctype_cntrl')) {
    function ctype_cntrl($text) { return p\Ctype::ctype_cntrl($text); }
}
if (!function_exists('ctype_digit')) {
    function ctype_digit($text) { return p\Ctype::ctype_digit($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')) {

if (!function_exists('ctype_alpha')) {
    function ctype_alpha(mixed $text): bool { return p\Ctype::ctype_alpha($text); }
}
if (!function_exists('ctype_cntrl')) {
    function ctype_cntrl(mixed $text): bool { return p\Ctype::ctype_cntrl($text); }
}
if (!function_exists('ctype_digit')) {
    function ctype_digit(mixed $text): bool { return p\Ctype::ctype_digit($text); }
}
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')) {