<?php

$content = file_get_contents("http://ssss.com/sssss");
preg_match("#<p>\s*(\d+)\s*<\/p>#i", $content, $match);
echo $match[1];

?>

<?php

$content = file_get_contents("http://ssss.com/sssss");
preg_match_all("#<p>\s*(\d+)\s*<\/p>#i", $content, $match);
var_dump($match[1]);

?>