What potential issues can arise when trying to scrape data from websites like Google using curl in PHP?

One potential issue when scraping data from websites like Google using curl in PHP is that Google may block your requests if they detect automated scraping activity. To solve this, you can set a user-agent header in your curl request to mimic a real browser and reduce the chances of being detected as a bot. 

$url = 'https://www.google.com';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.3');
$output = curl_exec($ch);
curl_close($ch);

echo $output;

Keywords

cURL web scraping Google HTTP headers user-agent

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