How can PHP remotely retrieve the contents of a PDF file?

Here is an example code in PHP that can be used to remotely read the contents of a PDF file using the cURL library.

<?php
// 创建cURL资源
$ch = curl_init();

// 设置URL和其他cURL选项
curl_setopt($ch, CURLOPT_URL, 'http://example.com/path/to/pdf.pdf');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_BINARYTRANSFER, true);

// 发送请求并获取响应
$response = curl_exec($ch);

// 关闭cURL资源
curl_close($ch);

// 将PDF内容保存到本地文件
$file = 'path/to/save/pdf.pdf';
file_put_contents($file, $response);

// 读取PDF文件内容
$pdfContent = file_get_contents($file);

// 输出PDF文件内容
echo $pdfContent;
?>

This code saves a remote PDF file locally, reads its content, and outputs it. You can modify the code according to your needs, such as saving the PDF content to a database or performing other processing.