_wp_specialchars() │ WP 1.2.2

Converts a number of special characters into their HTML entities.

Specifically deals with: &, <, >, ", and '.

$quote_style can be set to ENT_COMPAT to encode " to ", or ENT_QUOTES to do both. Default is ENT_NOQUOTES where no quotes are encoded.

No Hooks.

Return

String. The encoded text with HTML entities.

Usage

_wp_specialchars( $text, $quote_style, $charset, $double_encode );

$text(string) (required)

The text which is to be encoded.

$quote_style(int|string)

Converts double quotes if set to ENT_COMPAT, both single and double if set to ENT_QUOTES or none if set to ENT_NOQUOTES. Converts single and double quotes, as well as converting HTML named entities (that are not also XML named entities) to their code points if set to ENT_XML1. Also compatible with old values; converting single quotes if set to 'single', double if set to 'double' or both if otherwise set.
Default: ENT_NOQUOTES

$charset(false|string)

The character encoding of the string.
Default: false

$double_encode(true|false)

Whether to encode existing HTML entities.
Default: false

Changelog

_wp_specialchars() wp specialchars code ^{WP 6.5.2}

function _wp_specialchars( $text, $quote_style = ENT_NOQUOTES, $charset = false, $double_encode = false ) {
	$text = (string) $text;

	if ( 0 === strlen( $text ) ) {
		return '';
	}

	// Don't bother if there are no specialchars - saves some processing.
	if ( ! preg_match( '/[&<>"\']/', $text ) ) {
		return $text;
	}

	// Account for the previous behavior of the function when the $quote_style is not an accepted value.
	if ( empty( $quote_style ) ) {
		$quote_style = ENT_NOQUOTES;
	} elseif ( ENT_XML1 === $quote_style ) {
		$quote_style = ENT_QUOTES | ENT_XML1;
	} elseif ( ! in_array( $quote_style, array( ENT_NOQUOTES, ENT_COMPAT, ENT_QUOTES, 'single', 'double' ), true ) ) {
		$quote_style = ENT_QUOTES;
	}

	// Store the site charset as a static to avoid multiple calls to wp_load_alloptions().
	if ( ! $charset ) {
		static $_charset = null;
		if ( ! isset( $_charset ) ) {
			$alloptions = wp_load_alloptions();
			$_charset   = isset( $alloptions['blog_charset'] ) ? $alloptions['blog_charset'] : '';
		}
		$charset = $_charset;
	}

	if ( in_array( $charset, array( 'utf8', 'utf-8', 'UTF8' ), true ) ) {
		$charset = 'UTF-8';
	}

	$_quote_style = $quote_style;

	if ( 'double' === $quote_style ) {
		$quote_style  = ENT_COMPAT;
		$_quote_style = ENT_COMPAT;
	} elseif ( 'single' === $quote_style ) {
		$quote_style = ENT_NOQUOTES;
	}

	if ( ! $double_encode ) {
		/*
		 * Guarantee every &entity; is valid, convert &garbage; into &amp;garbage;
		 * This is required for PHP < 5.4.0 because ENT_HTML401 flag is unavailable.
		 */
		$text = wp_kses_normalize_entities( $text, ( $quote_style & ENT_XML1 ) ? 'xml' : 'html' );
	}

	$text = htmlspecialchars( $text, $quote_style, $charset, $double_encode );

	// Back-compat.
	if ( 'single' === $_quote_style ) {
		$text = str_replace( "'", '&#039;', $text );
	}

	return $text;
}