Home › Forums › Backend Issues (wp-admin) › Check number when saving › Reply To: Check number when saving
https://www.advancedcustomfields.com/resources/acf-validate_value/ In your case the value passed will be an array of post IDs and you need to check that it contains at least 2
if (count($value) < 2) {
$valid = 'Select at least 2';
}
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