php fopen 有关问题

php fopen 问题求助
templetest.php

PHP code

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<?php $title     = "tst";
   $file        = "hehe";
   $fp       = fopen ("temp.html","r");
   $content  = fread ($fp,filesize ("temp.html"));
  // echo "读取的信息".$content."<br>";
   $content .= str_replace ("{file}",$file,$content);
   // echo $content;
   $content .= str_replace ("{title}",$title,$content);   
   $filename = "test.html";
   $handle    = fopen ($filename,"w"); //打开文件指针，创建文件
   /*
　检查文件是否被创建且可写
   */
   if (!is_writable ($filename)){
      die ("文件：".$filename."不可写，请检查其属性后重试！");
   }
   if (!fwrite ($handle,$content)){  //将信息写入文件
      die ("生成文件".$filename."失败！");
   } 
   fclose ($handle); //关闭指针   
   die ("创建文件".$filename."成功！");
?>

temp.html

PHP code

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  <title>{title}</title>
  
     {file}
  

生成之后的界面
test.html

HTML code

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  <title>{title}</title>
  
     {file}
  


  
  
     hehe
  


  
  
     {file}
  


  
  
     hehe
  

尝试做文章静态化
问：为什么会出现这么多次、我只需要最后一次。。

------解决方案--------------------
$content = str_replace ("{file}",$file,$content);
// echo $content;
$content = str_replace ("{title}",$title,$content);

没有 . ，不然的话会把处理前后结果相连