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valid_unicode › WordPress Function

Since2.7.0
Deprecatedn/a
› valid_unicode ( $i )
Parameters:
  • (int) $i Unicode codepoint.
    Required: Yes
See:
Returns:
  • (bool) Whether or not the codepoint is a valid Unicode codepoint.
Defined at:
Codex:

Determines if a Unicode codepoint is valid.

The definition of a valid Unicode codepoint is taken from the XML definition: > Characters > > … > Legal characters are tab, carriage return, line feed, and the legal characters of > Unicode and ISO/IEC 10646. > … > Char ::= #x9 | #xA | #xD | [#x20-#xD7FF] | [#xE000-#xFFFD] | [#x10000-#x10FFFF]


Related Functions: wp_validate_auth_cookie, add_shortcode, validate_username, validate_user_form, wp_video_shortcode

Source 

function valid_unicode( $i ) {
	$i = (int) $i;

	return (
		0x9 === $i || // U+0009 HORIZONTAL TABULATION (HT)
		0xA === $i || // U+000A LINE FEED (LF)
		0xD === $i || // U+000D CARRIAGE RETURN (CR)
		/*
		 * The valid Unicode characters according to the XML specification:
		 *
		 * > any Unicode character, excluding the surrogate blocks, FFFE, and FFFF.
		 */
		( 0x20 <= $i && $i <= 0xD7FF ) ||
		( 0xE000 <= $i && $i <= 0xFFFD ) ||
		( 0x10000 <= $i && $i <= 0x10FFFF )
	);
}