remove dublicate lines form
1111
11
222
222
33333
4444
1111
22
1 2 <textarea name="lines" cols="70" rows="30"> 3 <?php 4 $a=array_unique(explode("\n", $_POST['lines'])); 5 #natsort($a); 6 echo implode("\n",$a); 7 ?> 8 </textarea>
result:
111111
1111
11
222
33333
4444
22