Dynamically set maximum allowed rows on a repeater field on form render

If you need to dynamically control the max number of rows a user can add to a repeater, you may use the af/field/before_render filter to modify the field's settings before it is rendered as per the below example.

Note: this example uses the `/name=FIELD_NAME` variant of the filter so be sure to replace FIELD_NAME with the name of the ACF field being targeted.

add_filter( 'af/field/before_render/name=FIELD_NAME', function ( $field, $form, $args ) {
  // Set the condition here to determine whether to limit the repeater rows.
  $condition = true;

  // If condition is true, limit the repeater rows to desired number. 
  if ( $condition ) {
    $field['max'] = 2;
  }

  return $field;
}, 10, 3 );