wp_kses_attr( string $element, string $attr, array $allowed_html, string[] $allowed_protocols )

如果此元素不允许任何属性，则移除所有属性。
Removes all attributes, if none are allowed for this element.

目录锚点：#说明#参数#源码

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说明（Description）

如果允许某些代码，则调用wp_kses_hair（）进一步拆分它们，然后根据kses_hair（）返回的数据构建新的HTML代码。如果还有的字符，也会删除。它要做的另一件事是检查标记是否有结束的XHTML斜杠，如果有，它也会在返回的代码中放入一个。

参数（Parameters）

源码（Source）

/**
 * Removes all attributes, if none are allowed for this element.
 *
 * If some are allowed it calls wp_kses_hair() to split them further, and then
 * it builds up new HTML code from the data that kses_hair() returns. It also
 * removes "<" and="" "="">" characters, if there are any left. One more thing it does
 * is to check if the tag has a closing XHTML slash, and if it does, it puts one
 * in the returned code as well.
 *
 * @since 1.0.0
 *
 * @param string $element           HTML element/tag
 * @param string $attr              HTML attributes from HTML element to closing HTML element tag
 * @param array  $allowed_html      Allowed HTML elements
 * @param array  $allowed_protocols Allowed protocols to keep
 * @return string Sanitized HTML element
 */
function wp_kses_attr($element, $attr, $allowed_html, $allowed_protocols) {
	if ( ! is_array( $allowed_html ) )
		$allowed_html = wp_kses_allowed_html( $allowed_html );

	// Is there a closing XHTML slash at the end of the attributes?
	$xhtml_slash = '';
	if (preg_match('%s*/s*$%', $attr))
		$xhtml_slash = ' /';

	// Are any attributes allowed at all for this element?
	if ( ! isset($allowed_html[strtolower($element)]) || count($allowed_html[strtolower($element)]) == 0 )
		return "<$element$xhtml_slash>";

	// Split it
	$attrarr = wp_kses_hair($attr, $allowed_protocols);

	// Go through $attrarr, and save the allowed attributes for this element
	// in $attr2
	$attr2 = '';
	foreach ( $attrarr as $arreach ) {
		if ( wp_kses_attr_check( $arreach['name'], $arreach['value'], $arreach['whole'], $arreach['vless'], $element, $allowed_html ) ) {
			$attr2 .= ' '.$arreach['whole'];
		}
	}

	// Remove any "<" or="" "="">" characters
	$attr2 = preg_replace('/[<>]/', '', $attr2);

	return "<$element$attr2$xhtml_slash>";
}