<?php
$f = fopen ('php://stdin', 'r');
$page = '';
while ($line = fgets($f)) {
  $page .= $line;
}
fclose ($f);
preg_match_all('#(?:(?<=\bhref="/like_box\.php\?id=)|' .
                '(?<=\bsrc="https://graph\.facebook\.com/))\d+#i',
                $page, $result, PREG_PATTERN_ORDER);
print_r ($result);
?>