Why doesn't this join logic works?

Hello;

I using the following sql to get information from two tables –through join;

/

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/ this join works in sql, but can
$res = "select ad.firstname, ad.lastname, ad.address, ad.city, ad.state, ad.zipcode, ad.dhtmlgoodies_category, ad.dhtmlgoodies_subcategory, ad.caryear, ad.customerid, ad.servicedesc, aj.email,  aj.areacode, aj.phoneprefix, ad.clientID,
aj.phonesufix, aj.cellareacode, aj.cellprefix, aj.cellsufix, aj.commentonclient from additional_cars as ad, ajax_client as aj where ad.clientID='$clientId' group by ad.clientID";

/ this join works in sql, but can<br /><br />$res = “select ad.firstname, ad.lastname, ad.address, ad.city, ad.state, ad.zipcode, ad.dhtmlgoodies_category, ad.dhtmlgoodies_subcategory, ad.caryear, ad.customerid, ad.servicedesc, aj.email, aj.areacode, aj.phoneprefix, ad.clientID,<br /><br />aj.phonesufix, aj.cellareacode, aj.cellprefix, aj.cellsufix, aj.commentonclient from additional_cars as ad, ajax_client as aj where ad.clientID=’$clientId’ group by ad.clientID”;

it works fine when tested in phpmyadmin, but fail we incorporated with the following which passes the value to another form using “formObj”. here is the entire code:

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function toSafeString($string) {
  $string = str_replace('
', "n", $string);
   $string = preg_replace('/[rn]/s', 'n', $string);
  $string = str_replace(array('','
'),"n",$string);
     return $string;
   }

if(isset($_GET['getClientId'])){
  $clientId = preg_replace("/[