1,显示网页源代码

<?php 
$lines = file('http://www.baidu.com/');
foreach ($lines as$line_num => $line) {
// loop thru each line and prepend line numbers
echo "Line # {$line_num} : " . htmlspecialchars($line) . "
\n";
}
?>

2,检查服务器是否使用HTTPS

<?php 
if ($_SERVER&#91;'HTTPS'&#93;!= "on") {
echo "This is not HTTPS";
}else{
echo "This is HTTPS";
}
?>

3,使用PHP做Whois检查

<?php 
function whois_query($domain) {
// fix the domain name:
$domain = strtolower(trim($domain));
$domain = preg_replace('/^http:\/\//i', '', $domain);
$domain = preg_replace('/^www\./i', '',$domain);
$domain = explode('/',$domain);
$domain = trim($domain&#91;0&#93;);
// split the TLD from domain name
$_domain = explode('.',$domain);
$lst = count($_domain)-1;
$ext = $_domain&#91;$lst&#93;;
// You find resources and lists
// like these on wikipedia:
//
// http://de.wikipedia.org/wiki/Whois
//
$servers = array(
"biz" =>"whois.neulevel.biz",
"com" =>"whois.internic.net",
"us" => "whois.nic.us",
"coop" =>"whois.nic.coop",
"info" =>"whois.nic.info",
"name" =>"whois.nic.name",
"net" =>"whois.internic.net",
"gov" =>"whois.nic.gov",
"edu" =>"whois.internic.net",
"mil" =>"rs.internic.net",
"int" =>"whois.iana.org",
"ac" => "whois.nic.ac",
"ae" =>"whois.uaenic.ae",
"at" => "whois.ripe.net",
"au" =>"whois.aunic.net",
"be" => "whois.dns.be",
"bg" =>"whois.ripe.net",
"br" =>"whois.registro.br",
"bz" =>"whois.belizenic.bz",
"ca" => "whois.cira.ca",
"cc" => "whois.nic.cc",
"ch" => "whois.nic.ch",
"cl" => "whois.nic.cl",
"cn" =>"whois.cnnic.net.cn",
"cz" => "whois.nic.cz",
"de" => "whois.nic.de",
"fr" => "whois.nic.fr",
"hu" => "whois.nic.hu",
"ie" =>"whois.domainregistry.ie",
"il" =>"whois.isoc.org.il",
"in" =>"whois.ncst.ernet.in",
"ir" => "whois.nic.ir",
"mc" =>"whois.ripe.net",
"to" =>"whois.tonic.to",
"tv" => "whois.tv",
"ru" =>"whois.ripn.net",
"org" => "whois.pir.org",
"aero" =>"whois.information.aero",
"nl" => "whois.domain-registry.nl"
);
if (!isset($servers[$ext])){
die('Error: No matching nic server found!');
}
$nic_server =$servers[$ext];
$output = '';
// connect to whois server:
if ($conn = fsockopen ($nic_server, 43)) {
fputs($conn,$domain."\r\n");
while(!feof($conn)) {
$output .= fgets($conn,128);
}
fclose($conn);
}
else { die('Error: Could not connect to ' . $nic_server. '!'); }
return $output;
}
echo whois_query('www.xiariboke.net');
?>