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/**
 * Send XML response back to Ajax request.
 *
 * @package WordPress
 * @since 2.1.0
 */
#[AllowDynamicProperties]
class WP_Ajax_Response {
	/**
	 * Store XML responses to send.
	 *
	 * @since 2.1.0
	 * @var array
	 */
	public $responses = array();

	/**
	 * Constructor - Passes args to WP_Ajax_Response::add().
	 *
	 * @since 2.1.0
	 *
	 * @see WP_Ajax_Response::add()
	 *
	 * @param string|array $args Optional. Will be passed to add() method.
	 */
	public function __construct( $args = &#039;&#039; ) {
		if ( ! empty( $args ) ) {
			$this-&gt;add( $args );
		}
	}

	/**
	 * Appends data to an XML response based on given arguments.
	 *
	 * With `$args` defaults, extra data output would be:
	 *
	 *     &lt;response action=&#039;{$action}_$id&#039;&gt;
	 *      &lt;$what id=&#039;$id&#039; position=&#039;$position&#039;&gt;
	 *          &lt;response_data&gt;&lt;![CDATA[$data]]&gt;&lt;/response_data&gt;
	 *      &lt;/$what&gt;
	 *     &lt;/response&gt;
	 *
	 * @since 2.1.0
	 *
	 * @param string|array $args {
	 *     Optional. An array or string of XML response arguments.
	 *
	 *     @type string          $what         XML-RPC response type. Used as a child element of `&lt;response&gt;`.
	 *                                         Default &#039;object&#039; (`&lt;object&gt;`).
	 *     @type string|false    $action       Value to use for the `action` attribute in `&lt;response&gt;`. Will be
	 *                                         appended with `_$id` on output. If false, `$action` will default to
	 *                                         the value of `$_POST[&#039;action&#039;]`. Default false.
	 *     @type int|WP_Error    $id           The response ID, used as the response type `id` attribute. Also
	 *                                         accepts a `WP_Error` object if the ID does not exist. Default 0.
	 *     @type int|false       $old_id       The previous response ID. Used as the value for the response type
	 *                                         `old_id` attribute. False hides the attribute. Default false.
	 *     @type string          $position     Value of the response type `position` attribute. Accepts 1 (bottom),
	 *                                         -1 (top), HTML ID (after), or -HTML ID (before). Default 1 (bottom).
	 *     @type string|WP_Error $data         The response content/message. Also accepts a WP_Error object if the
	 *                                         ID does not exist. Default empty.
	 *     @type array           $supplemental An array of extra strings that will be output within a `&lt;supplemental&gt;`
	 *                                         element as CDATA. Default empty array.
	 * }
	 * @return string XML response.
	 */
	public function add( $args = &#039;&#039; ) {
		$defaults = array(
			&#039;what&#039;         =&gt; &#039;object&#039;,
			&#039;action&#039;       =&gt; false,
			&#039;id&#039;           =&gt; &#039;0&#039;,
			&#039;old_id&#039;       =&gt; false,
			&#039;position&#039;     =&gt; 1,
			&#039;data&#039;         =&gt; &#039;&#039;,
			&#039;supplemental&#039; =&gt; array(),
		);

		$parsed_args = wp_parse_args( $args, $defaults );

		$position = preg_replace( &#039;/[^a-z0-9:_-]/i&#039;, &#039;&#039;, $parsed_args[&#039;position&#039;] );
		$id       = $parsed_args[&#039;id&#039;];
		$what     = $parsed_args[&#039;what&#039;];
		$action   = $parsed_args[&#039;action&#039;];
		$old_id   = $parsed_args[&#039;old_id&#039;];
		$data     = $parsed_args[&#039;data&#039;];

		if ( is_wp_error( $id ) ) {
			$data = $id;
			$id   = 0;
		}

		$response = &#039;&#039;;
		if ( is_wp_error( $data ) ) {
			foreach ( (array) $data-&gt;get_error_codes() as $code ) {
				$response  .= &quot;&lt;wp_error code=&#039;$code&#039;&gt;&lt;![CDATA[&quot; . $data-&gt;get_error_message( $code ) . &#039;]]&gt;&lt;/wp_error&gt;&#039;;
				$error_data = $data-&gt;get_error_data( $code );
				if ( ! $error_data ) {
					continue;
				}
				$class = &#039;&#039;;
				if ( is_object( $error_data ) ) {
					$class      = &#039; class=&quot;&#039; . get_class( $error_data ) . &#039;&quot;&#039;;
					$error_data = get_object_vars( $error_data );
				}

				$response .= &quot;&lt;wp_error_data code=&#039;$code&#039;$class&gt;&quot;;

				if ( is_scalar( $error_data ) ) {
					$response .= &quot;&lt;![CDATA[$error_data]]&gt;&quot;;
				} elseif ( is_array( $error_data ) ) {
					foreach ( $error_data as $k =&gt; $v ) {
						$response .= &quot;&lt;$k&gt;&lt;![CDATA[$v]]&gt;&lt;/$k&gt;&quot;;
					}
				}

				$response .= &#039;&lt;/wp_error_data&gt;&#039;;
			}
		} else {
			$response = &quot;&lt;response_data&gt;&lt;![CDATA[$data]]&gt;&lt;/response_data&gt;&quot;;
		}

		$s = &#039;&#039;;
		if ( is_array( $parsed_args[&#039;supplemental&#039;] ) ) {
			foreach ( $parsed_args[&#039;supplemental&#039;] as $k =&gt; $v ) {
				$s .= &quot;&lt;$k&gt;&lt;![CDATA[$v]]&gt;&lt;/$k&gt;&quot;;
			}
			$s = &quot;&lt;supplemental&gt;$s&lt;/supplemental&gt;&quot;;
		}

		if ( false === $action ) {
			$action = $_POST[&#039;action&#039;];
		}
		$x  = &#039;&#039;;
		$x .= &quot;&lt;response action=&#039;{$action}_$id&#039;&gt;&quot;; // The action attribute in the xml output is formatted like a nonce action.
		$x .= &quot;&lt;$what id=&#039;$id&#039; &quot; . ( false === $old_id ? &#039;&#039; : &quot;old_id=&#039;$old_id&#039; &quot; ) . &quot;position=&#039;$position&#039;&gt;&quot;;
		$x .= $response;
		$x .= $s;
		$x .= &quot;&lt;/$what&gt;&quot;;
		$x .= &#039;&lt;/response&gt;&#039;;

		$this-&gt;responses[] = $x;
		return $x;
	}

	/**
	 * Display XML formatted responses.
	 *
	 * Sets the content type header to text/xml.
	 *
	 * @since 2.1.0
	 */
	public function send() {
		header( &#039;Content-Type: text/xml; charset=&#039; . get_option( &#039;blog_charset&#039; ) );
		echo &quot;&lt;?xml version=&#039;1.0&#039; encoding=&#039;&quot; . get_option( &#039;blog_charset&#039; ) . &quot;&#039; standalone=&#039;yes&#039;?&gt;&lt;wp_ajax&gt;&quot;;
		foreach ( (array) $this-&gt;responses as $response ) {
			echo $response;
		}
		echo &#039;&lt;/wp_ajax&gt;&#039;;
		if ( wp_doing_ajax() ) {
			wp_die();
		} else {
			die();
		}
	}
}
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