<?
Error_Reporting(E_ALL & ~E_NOTICE);
$file = file("base.txt");
foreach ($file as $key=>$curent_element) {
foreach ($file as $key+1=>$val) {
if (similar_text($curent_element, $val) > 30) {
unset($file[$key]); } }
....
while(!feof($base)) {
$pr = fgets($base);
fputs($file_r,$zap); }
?>