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add action and add filter question (1 post)

  1. Travel_Tech
    Member
    Posted 2 years ago #

    Howdy! I've searched high and low for an answer to this. If someone could point me in the right direction, I would be grateful.
    What to the number 10 and 3 do in these two functions?

    add_action('register_post','check_fields',10,3);
    add_filter( 'authenticate', 'persona_login_custom_function', 10, 3 );

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