What are the best practices for extracting and processing URLs from a website using PHP functions?

When extracting and processing URLs from a website using PHP functions, it's important to use the correct functions to ensure accuracy and efficiency. One common approach is to use regular expressions to extract URLs from the website's content, and then process them as needed. Additionally, using built-in PHP functions like `file_get_contents()` to retrieve the website's content can simplify the extraction process. 

// Example code to extract and process URLs from a website using PHP

// URL of the website to extract URLs from
$website_url = 'https://example.com';

// Retrieve the website content
$website_content = file_get_contents($website_url);

// Use regular expression to extract URLs from the content
preg_match_all('/(https?:\/\/[\da-z\.-]+\.[a-z\.]{2,6}[\/\w \.-]*)/', $website_content, $urls);

// Process the extracted URLs
foreach ($urls[0] as $url) {
    // Do something with each URL, such as echoing it
    echo $url . "<br>";
}

Keywords

Regular expressions parse_url urlencode cURL DOMDocument

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