4 commonly used methods to crawl network data in PHP, 4 ways to crawl data in PHP_PHP Tutorial

Four commonly used methods of crawling network data in PHP, four methods of crawling data in PHP

The name of this section is fsockopen, curl and file_get_contents, specifically discussing these three methods Make some summaries of network data input and output. We have talked a lot about fsockopen before, let’s move on to others. Here is a brief list of some common methods of crawling network data.

1. Use file_get_contents to get the content in get mode:

$url = 'http://localhost/test2.php';
$html = file_get_contents($url);
echo $html;

2. Use fopen to open the url and get the content via get

$url = 'http://localhost/test2.php';
$fp = fopen($url, 'r');
stream_get_meta_data($fp);
$result = '';
while(!feof($fp))
{
  $result .= fgets($fp, 1024);
}
echo "url body: $result";
fclose($fp);

3. Use the file_get_contents function to get the url in post mode

$data = array(
 'foo'=>'bar',
 'baz'=>'boom',
 'site'=>'www.jb51.net',
 'name'=>'nowa magic');
 
$data = http_build_query($data);

//$postdata = http_build_query($data);
$options = array(
 'http' => array(
 'method' => 'POST',
 'header' => 'Content-type:application/x-www-form-urlencoded',
 'content' => $data
 //'timeout' => 60 * 60 // 超时时间（单位:s）
 )
);

$url = "http://localhost/test2.php";
$context = stream_context_create($options);
$result = file_get_contents($url, false, $context);

echo $result;

4. Use the curl library. Before using the curl library, you may need to check whether the curl extension has been turned on in php.ini

$url = 'http://localhost/test2.php?site=jb51.net';
$ch = curl_init();
$timeout = 5;
curl_setopt ($ch, CURLOPT_URL, $url);
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
$file_contents = curl_exec($ch);
curl_close($ch);
echo $file_contents;

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