Support » Everything else WordPress » Can’t set cookies in a plugin

  • Hi, recently I made a plugin for wordpress just to try it out. However I can’t set cookies in that plugin not sure why…

    function check()
    setcookie ("Verificar", "activo", time() - 86400);
    add_action('wp_footer', 'check');

    Basically this function sets a cookie and when it does it shows me an error :

    Warning: Cannot modify header information – headers already sent by (output started ……………)

    I would appreciate any help…

    Thank you

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