wordpress - Getting ACF field value in functions.php -

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i try add link file (uploaded in acf field) in gravity form notification, in wordpress.

so, given in gravity form , acf documentation, tried in functions.php add hook gravity form notification mail function : 

add_filter( 'gform_notification_1', 'my_gform_add_link', 10, 3 ); function my_gform_add_link( $notification, $form, $entry ) {     $postid = intval($entry[2]); //return id of post int     $notification['message'] .= '\n <a href="'.get_field('spec-file', $postid).'">see furniture specs</a>';      return $notification; }

in code above : $postid works expected (it returns expected post id). thing : get_field('spec-file', $postid) (which recommended method field value outside loop - http://www.advancedcustomfields.com/resources/how-to-get-values-from-another-post/) returns empty.

why ? idea ?

edit : the post id wasn't correct, fixed , code above works expected.


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