You first have to initialize your string :
$stringd = "xxx";
Then, loop, concatenating at the end of that variable :
for($i=1;$i<=$_POST['cc'];$i++) {
$stringd .= $_POST[$i]." ";
}
And, finally, end with the last part :
$stringd .= "hello";
But you cannot do all (especially, the loop) that in a single operation.
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