```
    $a="abc";
    $b=123;
    $c=1;

    for ($i=0;$i<3;$i++) {
        $str="'" . $a . "' , '" . $b . "', '" . $c . "', '1'";
        $sum .= "(" . $str . "),";
    }
    //output ('abc' , '123', '1', '1'),('abc' , '123', '1', '1'),('abc' , '123', '1', '1'),
    echo $sum;

```

Can anyone help me with the above codes?
I want the `$sum` to output `('abc' , '123', '1', '1'),` one time only.
That I have to check the `$str` is repeated.

Can anyone help me or give me some hits?
Thanks.