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update multiple fields at once through functions.php

  • Hi.
    I need to update multiple fields at once (or as quick as possible) because I created a custom field after many posts had been made

    I know that values are not shown until I hit save in post edit page(just returns null).

    Some posts were updated manually, but there are so many to go…
    I want to update only those have not been saved yet.

    How can I do it in functions.php (by post type if possible)?
    Any help or helpful link would be appreciated.


  • There isn’t an easy way to do this. You will need to

    1) Get all the posts of the post type
    2) Check to see if the field already has a value
    3) update if it doesn’t

    Depending on the number of posts involved, this process could very well time out before completion.

    The better alternative is to set a default value if the field does not contain a value.

    $value = get_field('field_name');
    if (!$value) {
      $value = 'set some default value';

    The checking of this may need to be more complex, but that’s the idea.

    Alternately you could add an acf/load_value filter to the field and return a default value from this and this would not require altering templates where it’s used

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