Check if code point is a control character

IntlChar::isblank
IntlChar::isdefined
IntlChar
PHP Manual

# IntlChar::iscntrl

(PHP 7)

IntlChar::iscntrl — Check if code point is a control character

### Description

public static bool IntlChar::iscntrl ( mixed `$codepoint` )

Determines whether the specified code point is a control character.

A control character is one of the following:

- ISO 8-bit control character (U+0000..U+001f and U+007f..U+009f)
- `IntlChar::CHAR_CATEGORY_CONTROL_CHAR` (Cc)
- `IntlChar::CHAR_CATEGORY_FORMAT_CHAR` (Cf)
- `IntlChar::CHAR_CATEGORY_LINE_SEPARATOR` (Zl)
- `IntlChar::CHAR_CATEGORY_PARAGRAPH_SEPARATOR` (Zp)

### Parameters

`codepoint`

  The integer codepoint value (e.g. 0x2603 for U+2603 SNOWMAN), or the character encoded as a UTF-8 string (e.g. "\u{2603}")

### Return Values

Returns `TRUE` if `codepoint` is a control character, `FALSE` if not.

### Examples

Example #1 Testing different code points

`<?php
var_dump(IntlChar::iscntrl("A"));
var_dump(IntlChar::iscntrl(" "));
var_dump(IntlChar::iscntrl("\n"));
var_dump(IntlChar::iscntrl("\u{200e}"));
?>`

The above example will output:

    bool(false)
    bool(false)
    bool(true)
    bool(true)

### See Also

- IntlChar::isprint() - Check if code point is a printable character
- `IntlChar::PROPERTY_DEFAULT_IGNORABLE_CODE_POINT`

IntlChar::isblank
IntlChar::isdefined
IntlChar
PHP Manual