$text='111"№дэ
111"№дэ
111"№дэ
131"№дэ
111"№дэ
161"№дэ';

$array=explode("\r\n",$text);

$array_nodubl=array_unique($array);

$finish_text= implode("\r\n", $array_nodubl);

echo $finish_text;