link-template file and headers not sent error

  • Hi all,
    I am a newbie … please be kind ??

    I am using a script in a template file to redirect a user to a payment page. This goes with a header function: header('location: ' . $url). All of a sudden this does not work any more. The error message points to the fil link-template.php.
    This is the first line of the error message:
    Got error ‘PHP message: PHP Warning: Cannot modify header information – headers already sent by (output started at /home/akkidom1/domains/wcpn.nl/public_html/wp-includes/link-template.php:3283) in /home/akkidom1/domains/wcpn.nl/public_html/wp-content/themes/wcpn/ideal_verwerk.php on line 35

    After a few hours searching I now think it has something to do with empty spaces in the link-template.php wordpress file. Please help, as this is getting beyond me.

    Thank you for your help!

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