Question

我正在尝试查找文件是否存在。我的服务器不报告404，而是直接重定向到自定义404页面并返回302（重定向）或类似内容。我的情况是尝试第一个URL，如果文件不存在或无效，则显示备用URL。我的脚本如下：

$filename= 'http://35.164.39.39/quote1.pdf';
$handle = curl_init($filename);
    curl_setopt($handle,  CURLOPT_RETURNTRANSFER, TRUE);

    /* Get the HTML or whatever is linked in $url. */
    $response = curl_exec($handle);

    /* Check for 404 (file not found). */
    $httpCode = curl_getinfo($handle, CURLINFO_HTTP_CODE);
    curl_close($handle);

    /* If the document has loaded successfully without any redirection or error */
    if ($httpCode >= 200 && $httpCode < 300) {
       $new_url = 'http://34.219.140.48/quote1.pdf';
    } else {
    $new_url = 'http://35.164.39.39/quote1.pdf';
    }

然后我将呼叫new_url：

<a target="_blank" href="<?php echo $new_url; ?>">Quote</a>

我可以在上面的代码中看到它始终将$ filename条件设为true并加载此URL。谁能建议我该如何处理。预先谢谢你。

Answer 1

也许：

$proto = "http://";
$uri = "/quote1.pdf"; 

$success = $proto."34.219.140.48".$uri;
$failed = $proto."35.164.39.39".$uri;

$handle = curl_init($success);
curl_setopt($handle,  CURLOPT_RETURNTRANSFER, TRUE);

/* Get the HTML or whatever is linked in $url. */
$response = curl_exec($handle);

/* Check for 404 (file not found). */
$httpCode = curl_getinfo($handle, CURLINFO_HTTP_CODE);
curl_close($handle);

/* If the document has NOT loaded successfully without any redirection or error */
if ($httpCode !== 200) {
   echo "<a target=\"_blank\" href=\"<?php echo $failed; ?>\">Quote</a>";
}else{
   echo "<a target=\"_blank\" href=\"<?php echo $success; ?>\">Quote</a>"
}

Answer 2

    $url = 'http://34.219.140.48/quote1.pdf';
    $url1 = 'http://35.164.39.39/quote1.pdf';

    $handle = curl_init($url);
    curl_setopt($handle,  CURLOPT_RETURNTRANSFER, TRUE);

    $response = curl_exec($handle);

    /* Check if not 200 */
    $httpCode = curl_getinfo($handle, CURLINFO_HTTP_CODE);
    if($httpCode !== 200) {
        $url = $url1;
    }

    curl_close($handle);
    echo "<a target=\"_blank\" href=\"$url\">Quote</a>";

查找在PHP中找不到的404的URL

2 个答案: