問題：
What libraries, extensions etc. would be required to render a portion of a PDF document to an image file? 將PDF文檔的一部分呈現給圖像文件需要哪些庫，擴展等？
Most PHP PDF libraries that I have found center around creating PDF documents, but is there a simple way to render a document to an image format suitable for web use? 我找到的大多數PHP PDF庫都圍繞創建PDF文檔，但是有一種簡單的方法可以將文檔呈現爲適合Web使用的圖像格式嗎？
Our environment is a LAMP stack. 我們的環境是LAMP堆棧。
解決方案：
參考一： https://en.stackoom.com/question/1xh3參考二： https://stackoom.com/question/1xh3