Question

Just learning php and looking into someone else’s code. I’m not sure what is happening in this function with the word ‘and’ on the left side of the = operator. It seems like it is a ‘silent’ if is being used eg.
if $arry =true and $array2 = true then $array2 += ‘somthing’;

I cant seem to find any reference to this anywhere online.

  function get_list_filter($filter = array()) {
     global $current_user;
    $sql = array();
    $filter["clientID"]         and $sql[] = sprintf("(WD_domain.clientID = %d)",$filter["clientID"]);
    $filter["showDomainName"]   and $sql[] = sprintf("(WD_domain.domain LIKE '%%%s%%')",$filter["showDomainName"]);
    $filter["showManaged"]      and $sql[] = sprintf("(WD_domain.managed = %d)",$filter["showManaged"]);
    return $sql;
  }

Answer 1

It means that if the left side of the and evaluates to true, the right side will be executed also. In essence, if clientID evaluates to true (is non-false), then sprintf("(WD_domain.clientID = %d)",$filter["clientID"]) will be added to the $sql array.

It’s a lazy way of doing this:

if($filter["clientID"]) {
    $sql[] = sprintf("(WD_domain.clientID = %d)",$filter["clientID"]);
}