Grab Any Data on a Web Site Source with PHP

Hi everybody. If we want to grabbing any data on a web site source, we can use preg_match or preg_match_all function on PHP. Preg_match function is grab a data that can find first data and as preg_match_all function grab all data that can find datas.
For example:
Our HTML page’s(for example http://websiteaddress.com/test.html) source code:

<table style="width:100%">
  <caption>Monthly savings</caption>
  <tr>
    <th>Month</th>
    <th>Savings</th>
  </tr>
  <tr>
    <td>January</td>
    <td>$100</td>
  </tr>
  <tr>
    <td>February</td>
    <td>$50</td>
  </tr>
</table>

Our grabber web page’s code(with preg_match function):

$site=file_get_contents('http://websiteaddress.com/test.html');
preg_match('@<td>(.*?)</td>@si',$site,$myString);
var_dump($myString);

Our output:

array(2) { [0]=> string(16) "January" [1]=> string(7) "January" }

Our grabber web page’s code(with preg_match_all function):

$site=file_get_contents('http://websiteaddress.com/test.html');
preg_match_all('@<td>(.*?)</td>@si',$site,$myString);
var_dump($myString);

Our output:

array(2) { [0]=> array(4) { [0]=> string(16) "January" [1]=> string(13) "$100" [2]=> string(17) "February" [3]=> string(12) "$50" } [1]=> array(4) { [0]=> string(7) "January" [1]=> string(4) "$100" [2]=> string(8) "February" [3]=> string(3) "$50" } }