Sample code for PHP to collect web page images and save them locally

/**
 * Save web page files locally (for collecting pictures)
 * edit: bbs.it-home.org
 * @param file path $sUrl
 * @param save local path $sSavePath
 * @return boolean
*/
function download_file($sUrl,$sSavePath='')
{
    $sFileName = GetUrlFileExt($sUrl);
    $c = file_get_contents($sUrl);
    return file_put_contents($sSavePath.'/'.$sFileName,$c);
}

/**
 * Get the file name
 *
 * @param web page URL $sUrl
 * @return string
*/
function GetUrlFileExt($sUrl)
{
    $aAry = parse_url($sUrl);
    $sFile = basename($aAry['path']);
    $sExt = explode('.',$sFile);
    return $sExt[0].'.'.$sExt[1];
}

$sPath = "D:/marker_imgs";
for($i=1;$i<100;$i++)
{
    $sUrl = "http://bbs.it-home.org/red/marker$i.png";
    download_file($sUrl,$sPath);
}
?>