Displaying error messages for invalid input

  • I am searching for any info/tutorial etc on how to display errors.

    For instance, when I save a custom metabox – I would like to validate the data and send a message back to the user if the input was invalid.

    I have found plenty of instructions on how to save a post – but NONE of them describe how to report invalid data to the user.

    It also seems that the WP_ERROR construct is not what I am looking for. All I would like to do is when invalid data or some other error is found is to include a notice on the page that indicates what is not correct.

    Any resources that someone could point me to would be most appreciated.

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