IntlChar::iscntrl

(PHP 7)

Check if code point is a control character

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}")

Returns:

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

Examples:

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)