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php基础：PHP中解压RAR文件

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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><title>PHP解压RAR文件</title><link rel="stylesheet" type="text/css" href="style.css"><style type="text/css"><!--.STYLE1 {color: #FF0000}--></style></head><script language="javascript">function chkinput(form){   if(form.sourcefile.value==""){      alert("请选择要解压的文件地址!");      form.sourcefile.select();	  return(false);    }	 if(form.objfile.value==""){      alert("请输入解压文件存储地址!");      form.objfile.select();	  return(false);    }	return(true);}</script><body><table width="300" height="166" border="0" align="center" cellpadding="0" cellspacing="0">  <tr>    <td background="images/back.gif"><table width="300" border="0" cellpadding="0" cellspacing="0">      <form name="form1" method="post" action="index.php" onsubmit="return chkinput(this)">	  <tr>        <td height="50" colspan="2"> </td>      </tr>      <tr>        <td width="100" height="25"><div align="right">RAR文件地址：</div></td>        <td width="200"> <input type="file" name="sourcefile" size="18" class="inputcss"> </td>      </tr>      <tr>        <td height="25"><div align="right">解压后存储目录：</div></td>        <td height="25"> <input type="text" name="objfile" size="18" class="inputcss">        (c:/目录名)</td>      </tr>      <tr>        <td height="20" colspan="2"><div align="center" class="STYLE1">注意：解压文件的路径不应有空格</div></td>      </tr>      <tr>        <td colspan="2"><div align="center">          <input type="submit" name="submit" value="解压" class="buttoncss" />        </div></td>      </tr>	 </form>     </table></td>  </tr></table><?phpif($_POST[submit]!=""){ $sourcefile=$_POST[sourcefile];$objfile=$_POST[objfile]; $sourcefile=str_replace(chr(32)," ",$sourcefile);$obj=new com("wscript.shell");$obj->run("WinRAR x-r-o ".$sourcefile." ".$objfile."",1,true);echo "<script>alert('文件解压完成!');</script>";}?></body></html>

function.php:

<?phpfunction unhtml($content) {    $content=htmlspecialchars($content);    $content=str_replace(chr(13),"<br>",$content);    $content=str_replace(chr(32)," ",$content);    $content=str_replace("【","<",$content);    $content=str_replace("】",">",$content);    $content=str_replace("_"," ",$content);   return trim($content); }?>