PHP 显示图像（SSL 代理）

Question

我正在尝试制作一个接受 URL 并显示它的 PHP 脚本（尝试在我的项目中保留 SSL）

但是，我的脚本无法输出任何内容。没有显示任何错误，我不知所措。我没看到什么？

<?php

//if parameter is empty
if((!isset($_GET['img'])) or ($_GET['img'] == '') or (!isset($per['scheme'])))
{
    exit;
}

$per = parse_url($_GET['img']);
print_r ($per);
$imgurl = $_GET['img'];
print_r ($imgurl);
$imgurl = str_replace(' ', "%20", $imgurl);

$aFile = getimagesize($imgurl);
print_r ($aFile);

//check file extension
if($aFile == 'jpg' or $aFile == 'jpeg'){
        header('Content-Type: image/jpeg');
        imagejpeg(getimg($file));
} elseif($aFile == 'png') {
        header('Content-Type: image/png');
        imagepng(getimg($file));
} elseif($aFile == 'gif') {
        header('Content-Type: image/gif');
        imagegif(getimg($file));
} else {
        die('not supported');
}

$imgurl = $_GET['img'];
$imgurl = str_replace(' ', "%20", $imgurl);

function getimg($imageurl) {
    $cache_expire = 60*60*24*365;
    $headers[] = 'Accept: image/gif, image/x-bitmap, image/jpeg, image/pjpeg, image/png';
    $headers[] = 'Cache-Control: maxage=. $cache_expire';
    $headers[] = 'Pragma: public';
    $headers[] = 'Accept-Encoding: None';
    $headers[] = 'Content-type: application/x-www-form-urlencoded;charset=UTF-8';
    $user_agent = 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.8.1.6) Gecko/20070725 Firefox/2.0.0.6';
    $process = curl_init($imageurl);
    curl_setopt($process, CURLOPT_HTTPHEADER, $headers);
    curl_setopt($process, CURLOPT_REFERER, $_GET['img']);
    curl_setopt($process, CURLOPT_HEADER, 0);
    curl_setopt($process, CURLOPT_HTTPGET, true);
    curl_setopt($process, CURLOPT_USERAGENT, $user_agent);
    curl_setopt($process, CURLOPT_TIMEOUT, 30);
    curl_setopt($process, CURLOPT_RETURNTRANSFER, 1);
    $return = curl_exec($process);
    curl_close($process);
    return $return;
}
exit;
?>

这是脚本的编辑版本，当我使用 readfile 时会输出乱码：

<?php
error_reporting(E_ALL);
ini_set('display_errors', '1');

//if parameter is empty
if((!isset($_GET['img'])) or ($_GET['img'] == ''))
{
    exit;
}

$per = parse_url($_GET['img']);
$imgurl = $_GET['img'];
$imgurl = str_replace(' ', "%20", $imgurl);

$aFile = getimagesize($imgurl);

//check file extension
$checkmime = getimagesize($imgurl);

if($checkmime['mime'] != 'image/png' && $checkmime['mime'] != 'image/gif' && $checkmime['mime'] != 'image/jpeg') {
    die('not supported');
} else {
    readfile("$imgurl");
}

function getimg($imageurl) {
    $cache_expire = 60*60*24*365;
    $headers[] = 'Accept: image/gif, image/x-bitmap, image/jpeg, image/pjpeg, image/png';
    $headers[] = 'Cache-Control: maxage=. $cache_expire';
    $headers[] = 'Pragma: public';
    $headers[] = 'Accept-Encoding: None';
    $headers[] = 'Content-type: application/x-www-form-urlencoded;charset=UTF-8';
    $user_agent = 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.8.1.6) Gecko/20070725 Firefox/2.0.0.6';
    $process = curl_init($imageurl);
    curl_setopt($process, CURLOPT_HTTPHEADER, $headers);
    curl_setopt($process, CURLOPT_REFERER, $_GET['img']);
    curl_setopt($process, CURLOPT_HEADER, 0);
    curl_setopt($process, CURLOPT_HTTPGET, true);
    curl_setopt($process, CURLOPT_USERAGENT, $user_agent);
    curl_setopt($process, CURLOPT_TIMEOUT, 30);
    curl_setopt($process, CURLOPT_RETURNTRANSFER, 1);
    $return = curl_exec($process);
    curl_close($process);
    return $return;
}
exit;
?>

Answer 1

如果这确实是您的整个脚本，那么您的问题首先在于未设置$per['scheme']，因此它将触发第一个if() 语句并拥有脚本exit。

您检查它是否未在此处设置：!isset($per['scheme'])，因此它将生成表达式 TRUE 并因此结束脚本，即使来自 print_r(); 也没有输出

改用这个：

if (empty($_GET['img'])) // Check if $_GET['img'] is not set AND is = '' (empty)
{
    exit;
}

用途：

} else {
    header('Content-Type: ' . $checkmime['mime']);
    readfile($imgurl);
}