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Disable field if field is not empty

  • If the user is not an administrator, I would like to disable a specific field.
    I tried that:

    function disable_acf_load_field( $field ) {
    	if( !current_user_can( 'administrator' ) ) {
    		if (get_field($field['name'], $my_post_id)!="") {
             	      $field['disabled'] = true;
    	return $field;
    add_filter('acf/load_field/name=my_field', 'disable_acf_load_field');

    But I get a 500 internal server error!
    It looks like I can’t use get_field() inside this load_field filter.

    Do you have an idea on how I can get a readonly field if this field has a value already set?

    Many thanks!

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