wordpress - foogallery php shortcode with ID taken from AFC custom field variable does no display

Solution:

Try this:

$gallery_id = get_field('gallery', $post->ID );
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the_field() (docs) is for directly outputting a value, whileget_field() (docs) is for getting the value and for example setting a variable with it.

Edit: I misread your question and saw you already tried this. In that case, tryvar_dump($gallery_id), look for the returned values, and use the correct array key in returning the gallery ID.

So if the array key iskey, you'd use$gallery_id['key'] to output this key.

Solution:

Based on your other comments, it looks likethe_field() (docs) is returning an array, so if you are always expecting an array, you can usereset() (docs) to return the first value in that array.

You can also use the built-in functionfoogallery_render_gallery rather thando_shortcode.

And it is always good practice to check if the functions exist before you call them. This will help when those plugins are temporarily deactivated, then you will avoid fatal errors.

Try something like this:

//get the current post
$post = get_post();

//check to make sure ACF plugin is activated
if ( function_exists( 'the_field' ) ) {

  //get the field value from ACF
  $gallery_id = the_field( 'gallery', $post->ID );

  //we are expecting an array, so use reset to rewind the pointer to the first value
  reset( $gallery_id );

  //check to make sure FooGallery is activated
  if ( function_exists( 'foogallery_render_gallery') ) {

    //finally, render the gallery
    foogallery_render_gallery( $gallery_id );
  }
}
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