Question

Alert: This function’s access is marked private. This means it is not intended for use by plugin or theme developers, only in other core functions. It is listed here for completeness.

_wp_specialchars( string $string,  int|string $quote_style = ENT_NOQUOTES,  string $charset = false,  bool $double_encode = false )

Converts a number of special characters into their HTML entities.

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description

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.

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参数

$string

(string) (Required) The text which is to be encoded.

$quote_style

(int|string) (Optional) Converts double quotes if set to ENT_COMPAT, both single and double if set to ENT_QUOTES or none if set to ENT_NOQUOTES. Also compatible with old values; converting single quotes if set to 'single', double if set to 'double' or both if otherwise set. Default is ENT_NOQUOTES.

Default value: ENT_NOQUOTES

$charset

(string) (Optional) The character encoding of the string. Default is false.

Default value: false

$double_encode

(bool) (Optional) Whether to encode existing html entities. Default is false.

Default value: false

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返回值

(string) The encoded text with HTML entities.

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源代码

File: wp-includes/formatting.php

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

	if ( 0 === strlen( $string ) )
		return '';

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

	// Account for the previous behaviour of the function when the $quote_style is not an accepted value
	if ( empty( $quote_style ) )
		$quote_style = ENT_NOQUOTES;
	elseif ( ! in_array( $quote_style, array( 0, 2, 3, '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' ) ) )
		$charset = 'UTF-8';

	$_quote_style = $quote_style;

	if ( $quote_style === 'double' ) {
		$quote_style = ENT_COMPAT;
		$_quote_style = ENT_COMPAT;
	} elseif ( $quote_style === 'single' ) {
		$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.
		$string = wp_kses_normalize_entities( $string );
	}

	$string = @htmlspecialchars( $string, $quote_style, $charset, $double_encode );

	// Back-compat.
	if ( 'single' === $_quote_style )
		$string = str_replace( "'", ''', $string );

	return $string;
}

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更新日志

Version	description
1.2.2	Introduced.

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相关函数

Uses

• wp-includes/kses.php: wp_kses_normalize_entities()
• wp-includes/option.php: wp_load_alloptions()

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Used By

• wp-includes/formatting.php: esc_js()
• wp-includes/formatting.php: esc_html()
• wp-includes/formatting.php: esc_attr()

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User Contributed Notes