+/**
+ * Outputs the html checked attribute.
+ *
+ * Compares the first two arguments and if identical marks as checked
+ *
+ * @since 1.0.0
+ *
+ * @param mixed $checked One of the values to compare
+ * @param mixed $current (true) The other value to compare if not just true
+ * @param bool $echo Whether to echo or just return the string
+ * @return string html attribute or empty string
+ */
+function checked( $checked, $current = true, $echo = true ) {
+ return __checked_selected_helper( $checked, $current, $echo, 'checked' );
+}
+
+/**
+ * Outputs the html selected attribute.
+ *
+ * Compares the first two arguments and if identical marks as selected
+ *
+ * @since 1.0.0
+ *
+ * @param mixed $selected One of the values to compare
+ * @param mixed $current (true) The other value to compare if not just true
+ * @param bool $echo Whether to echo or just return the string
+ * @return string html attribute or empty string
+ */
+function selected( $selected, $current = true, $echo = true ) {
+ return __checked_selected_helper( $selected, $current, $echo, 'selected' );
+}
+
+/**
+ * Outputs the html disabled attribute.
+ *
+ * Compares the first two arguments and if identical marks as disabled
+ *
+ * @since 3.0.0
+ *
+ * @param mixed $disabled One of the values to compare
+ * @param mixed $current (true) The other value to compare if not just true
+ * @param bool $echo Whether to echo or just return the string
+ * @return string html attribute or empty string
+ */
+function disabled( $disabled, $current = true, $echo = true ) {
+ return __checked_selected_helper( $disabled, $current, $echo, 'disabled' );
+}
+
+/**
+ * Private helper function for checked, selected, and disabled.
+ *
+ * Compares the first two arguments and if identical marks as $type
+ *
+ * @since 2.8.0
+ * @access private
+ *
+ * @param mixed $helper One of the values to compare
+ * @param mixed $current (true) The other value to compare if not just true
+ * @param bool $echo Whether to echo or just return the string
+ * @param string $type The type of checked|selected|disabled we are doing
+ * @return string html attribute or empty string
+ */
+function __checked_selected_helper( $helper, $current, $echo, $type ) {
+ if ( (string) $helper === (string) $current )
+ $result = " $type='$type'";
+ else
+ $result = '';
+
+ if ( $echo )
+ echo $result;
+
+ return $result;
+}
+
+/**
+ * Default settings for heartbeat
+ *
+ * Outputs the nonce used in the heartbeat XHR
+ *
+ * @since 3.6.0
+ *
+ * @param array $settings
+ * @return array $settings
+ */
+function wp_heartbeat_settings( $settings ) {
+ if ( ! is_admin() )
+ $settings['ajaxurl'] = admin_url( 'admin-ajax.php', 'relative' );
+
+ if ( is_user_logged_in() )
+ $settings['nonce'] = wp_create_nonce( 'heartbeat-nonce' );
+
+ return $settings;
+}