php check if uploaded file already exists or has the same name

//Check whether an uploaded file with the same name already exists in the directory of the uploaded file

function searchFile($path,$file){
$file_array=array(); //存放文件名数组
$folder_array=array(); //存放目录名数组
$all_array=array(); //存放全部路径的数组
if(is_dir($path)){  //检查文件目录是否存在
$H = @ opendir($path);
while(false !== ($_file=readdir($H))){
//检索目录
if(is_dir($path."/".$_file) && $_file != "." && $_file!=".." && $_file!=="Thumbs.db"){
if(eregi('/'.$file,'/'.$_file)){
array_push($folder_array,$path."/".$_file);
}
searchFile($path."/".$_file,$file);
//检索文件
}elseif(is_file($path."/".$_file) && $_file!="." && $_file!=".." && $_file!=="Thumbs.db"){
echo $_file;
echo &#39;<br>&#39;;
//$_file = auto_charset($_file,&#39;utf-8&#39;,&#39;gbk&#39;);
if(eregi(&#39;/&#39;.$file,&#39;/&#39;.$_file)){
array_push($file_array,$path."/".$_file);
return &#39;yes&#39;; //文件存在
}
}
}
//$this->all_array["folder"]=$this->folder_array;
//$this->all_array["file"]=$this->file_array;
closedir($H);
return &#39;no&#39;; //不存在
}elseif(is_file($path)){
if(eregi($file,$path)){
//$this->all_array["file"]=$path;
return &#39;yes&#39;; //文件存在
} else {
return &#39;no&#39;; //文件不存在
}
}else{
return &#39;no&#39;; //文件不存在
}
}