gistfile1.php

<?php


// function to show errors
function rcp_show_error_messages( $error_id = '' ) {
  if( $codes = rcp_errors()->get_error_codes() ) {
		do_action( 'rcp_errors_before' );
		echo '<div class="rcp_message error">';
		    // Loop error codes and display errors
		   foreach( $codes as $code ) {
		   		if( rcp_errors()->get_error_data( $code ) == $error_id ) {

			        $message = rcp_errors()->get_error_message($code);
			        
			        do_action( 'rcp_error_before' );
			        echo '<p class="rcp_error"><span><strong>' . __( 'Error', 'rcp' ) . '</strong>: ' . esc_html( $message ) . '</span></p>';
			        do_action( 'rcp_error_after' );
		    	}
		    }
		echo '</div>';
		do_action( 'rcp_errors_after' );
	}	
}


// illustration of recording an error
rcp_errors()->add( 'username_unavailable', __( 'Username already taken', 'rcp' ), 'register' );

// illustration of showing just the "register" error messages:
rcp_show_error_messages( 'register' );