php 远程下载文件

HttpDownload :: save2dir ($url, $ localname, $ forcibly );

$forcibly (逼迫模式)

<?php

final class HttpDownload {

    public static $filesize;
    public static $Downloadstatus = FALSE;

    private static function getfilesize($url) {
        $headers = get_headers($url, 1);
        if($headers[0] == 'HTTP/1.1 200 OK') {
            if(isset($headers['Content-Length'])) {
                return self::$filesize = (int)$headers['Content-Length'];
            }
        }
        return self::$filesize = (int)0;
    }

    public static function save2dir($url, $localname, $forcibly = TRUE) {
        $filesize = self::getfilesize($url);
        if(is_resource(@fopen($url, 'r'))) {
            set_time_limit(0);
            if($forcibly) {
                if(file_exists($localname)) unlink($localname);
            }
            copy($url, $localname);
            return self::$Downloadstatus = (bool)true;
        }
        return self::$Downloadstatus = (bool)false;
    }

}

HttpDownload::save2dir('http://www.baidu.com/index.html', 'baidu.html');
if(HttpDownload::$Downloadstatus) {
    echo 'success';
}else{
    echo 'failed';
}
//该片段来自于http://outofmemory.cn