PHP支持断点续传实例代码

GET /Path/FileName HTTP/1.0
Host: www.server.com:80

$speed = 512;//此参数为下载最大速度
$pos = strrpos($file_path, "/");
$file_name = substr($file_path, $pos+1);
$file_size = filesize($file_path);
$ranges = getRange($file_size);
$fh =  fopen($file_path, "rb");
header('Cache-control: public');
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename='.$file_name);
if ($ranges != null) {
    header('HTTP/1.1 206 Partial Content');
    header('Accept-Ranges: bytes');
    header(sprintf('Content-Length: %u',$ranges['end'] - $ranges['start']));
    header(sprintf('Content-Range: bytes %s-%s/%s', $ranges['start'], $ranges['end'], $file_size));
    fseek($fh, sprintf('%u',$ranges['start']));
}else{
    header("HTTP/1.1 200 OK");
    header(sprintf('Content-Length: %s', $file_size));
}
while(!feof($fh))
{
    echo  fread($fh, round($speed*1024, 0));
    ob_flush();
    sleep(1);
}
($fh != null) && fclose($fh);

SELECT * FROM article
WHERE article_category IN (2,3)
ORDER BY article_id DESC
LIMIT 5

(
    SELECT * FROM article
    WHERE article_category=2
    ORDER BY article_id DESC
    LIMIT 5
) UNION ALL (
    SELECT * FROM article
    WHERE article_category=3
    ORDER BY article_id DESC
    LIMIT 5
)
ORDER BY article_id DESC
LIMIT 5
// 执行时间：0.0261

<?php
// 比较global、GLOBALS、static
$k = 0;
function test1() {
 global $k;
 static $i = 0;
 echo 'i:', ++$i, '<br/>';
 echo 'k:', ++$k, '<br/>';
}
test1();
test1();
echo 'i:', $i, '<br/>';
echo 'k:', $k, '<br/>';

echo '------------------<br/>';

function test2() {
 global $k;
 static $i = 0;
 echo 'i:', ++$i, '<br/>';
 echo 'k:', ++$k, '<br/>';
}
test2();
test2();
echo 'i:', $i, '<br/>';
echo 'k:', $k, '<br/>';

$m = 0;
$n = 0;
function test3() {
 global $m;
 echo 'm:', $m++ , '<br/>';
 echo 'n:', $GLOBALS['n']++ , '<br/>';
 unset($m, $GLOBALS['n']);
}
echo '------------------<br/>';
test3();

echo 'm:', $m, '<br/>';
echo 'n:', $n, '<br/>';

echo '------------------<br/>';

static $x = 0;
function test4() {
 echo 'x:', $x++ , '<br/>';
}

test4();

结果如下：

i:1
k:1
i:2
k:2
i:
k:2
------------------
i:1
k:3
i:2
k:4
i:
k:4
------------------
m:0
n:0
m:1
n:
------------------
x:

<?php
$ch = curl_init();
  
$url = "http://localhost/target_ip.php";
  
$header = array(
  'CLIENT-IP:58.68.44.61',
  'X-FORWARDED-FOR:58.68.44.61',
);
  
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
  
curl_setopt($ch, CURLOPT_RETURNTRANSFER,true);
  
$page_content = curl_exec($ch);
  
curl_close($ch);
  
echo $page_content;
  
?>

请求的目标文件target_ip.php:

代码
<?php
echo getenv('HTTP_CLIENT_IP');
echo getenv('HTTP_X_FORWARDED_FOR');
echo getenv('REMOTE_ADDR');
?>

1.php代码：

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "http://localhost/2.php");
curl_setopt($ch, CURLOPT_HTTPHEADER, array('X-FORWARDED-FOR:8.8.8.8', 'CLIENT-IP:8.8.8.8'));  //构造IP
curl_setopt($ch, CURLOPT_REFERER, "http://www.111cn.net/ ");   //构造来路
curl_setopt($ch, CURLOPT_HEADER, 1);
$out = curl_exec($ch);
curl_close($ch);

2.php代码如下：

function getClientIp() {
    if (!empty($_SERVER["HTTP_CLIENT_IP"]))
        $ip = $_SERVER["HTTP_CLIENT_IP"];
    else if (!empty($_SERVER["HTTP_X_FORWARDED_FOR"]))
        $ip = $_SERVER["HTTP_X_FORWARDED_FOR"];
    else if (!empty($_SERVER["REMOTE_ADDR"]))
        $ip = $_SERVER["REMOTE_ADDR"];
    else
        $ip = "err";
    return $ip;
}

echo "IP: " . getClientIp() . "";
echo "referer: " . $_SERVER["HTTP_REFERER"];