How to remove last comma (,) from array?

Question

I've gone through this address:

Passing an array to a query using a WHERE clause

and found that if I use a join clause to separate values , is also at the end of the array. How can I remove last?

I am using like this

$ttst=array();
$ttst=array(); 
$tt = "SELECT frd_id FROM network WHERE mem_id='$userId'"; 
$appLdone = execute_query($tt, true, "select"); 
foreach($appLdone as $kk=>$applist){ 
    $ttst[] = $applist['frd_id']; 
} 
$result = implode(',', $ttst); 

then also coming last ,

Thanks.

---

but it doesn't give single quote to each value .

Answer 1

join(',', array_filter($galleries))

array_filter gets rid of empty elements that you seem to have. Of course, you should take care not to have empty elements in there in the first place.

Answer 2

You could use trim() (or rtrim()):

$myStr = 'planes,trains,automobiles,';
$myStr = trim($myStr, ',');