php文件上传时文件名怎么转义

php文件上传时文件名如何转义？
php文件上传时文件名包含%和英文单引号和英文逗号会上传失败，怎么进行转义？急！

<br />
//循环排除替换文件名中的非法字符<br />
$errorchar=array ("-"," ","~","!","@","#","$","%","^","&","(",")","+",","," （","）","？","！","《","》","：","；","——");<br />
foreach($errorchar as $char)<br />
{<br />
    if(strpos($upload_file,$char)){<br />
        $upload_file=str_replace($char,"_",$upload_file);<br />
    }<br />
}