经典难题，请指教

Question

$arr=preg_split("/\s/",$readTxtContent);
$resultTxt=implode("\n\r",array_unique($arr));
然后将$resultTxt覆盖写入文件

Answer 1

<?
$buf = fread(fopen("test.txt","r"),filesize("test.txt"));
$array = explode("\n",$buf);
$temp = array();
for($i=0;$i<count($array);$i++)
   if(!array_search($array[$i],$temp)) array_push($temp,$array[$i]);
$buf = implode("\n",$temp);
$f = fopen("test.txt","w");
fwrite($f,$buf,count($buf));
?>差不多是这样吧，没测试过。祝你好运。呵呵~~~~~~~~~

Answer 2

<?
$fileName="test.txt";
$arr=file($fileName);
$fp=fopen($fileName,"w");
fputs($fp,implode("",array_unique($arr)));
fclose($fp);
?>