How to get all links on a web page in PHP

In web development, sometimes we need to get all the links on a web page and process them further. PHP provides some built-in functions and libraries that enable us to achieve this easily. In this article, we will introduce a common method to get all links on a web page and provide corresponding source code examples.

Step 1: Send an HTTP request and get the web page content

First, we need to use PHP to send an HTTP request and get the content of the web page. We can use the curl library or the file_get_contents function to achieve this step. The following is sample code using the curl library:

$url = 'http://www.example.com'; // 要获取链接的网页URL

$ch = curl_init($url);
curl_setopt($ch