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    ▪如何使用php判断服务器是否是HTTPS连接       代码如下:if ($_SERVER['HTTPS'] != "on") { echo "This is not HTTPS";}else{ echo "This is HTTPS";}if ($_SERVER['HTTPS'] != "on") { echo "This is not HTTPS";}else{ echo "This is HTTPS";} ......

    ▪使用PHP实现蜘蛛访问日志统计       代码如下:$useragent = addslashes(strtolower($_SERVER['HTTP_USER_AGENT'])); if (strpos($useragent, 'googlebot')!== false){$bot = 'Google';} elseif (strpos($useragent,'mediapartners-google') !== false){$bot = 'Google Adsense';} elseif (strpos($.........

    ▪PHP系统命令函数使用分析       代码如下:function execute($cmd) {     $res = '';     if ($cmd) {         if(function_exists('system')) {             @ob_start();             @system($cmd);             $res = @ob_get_contents(.........

代码如下:

if ($_SERVER['HTTPS'] != "on") {
 echo "This is not HTTPS";
}else{
 echo "This is HTTPS";
}if ($_SERVER['HTTPS'] != "on") {
 echo "This is not HTTPS";
}else{
 echo "This is HTTPS";
}

代码如下:

$useragent = addslashes(strtolower($_SERVER['HTTP_USER_AGENT']));

 if (strpos($useragent, 'googlebot')!== false){$bot = 'Google';}
 elseif (strpos($useragent,'mediapartners-google') !== false){$bot = 'Google Adsense';}
 elseif (strpos($useragent,'baiduspider') !== false){$bot = 'Baidu';}
 elseif (strpos($useragent,'sogou spider') !== false){$bot = 'Sogou';}
 elseif (strpos($useragent,'sogou web') !== false){$bot = 'Sogou web';}
 elseif (strpos($useragent,'sosospider') !== false){$bot = 'SOSO';}
 elseif (strpos($useragent,'360spider') !== false){$bot = '360Spider';}
 elseif (strpos($useragent,'yahoo') !== false){$bot = 'Yahoo';}
 elseif (strpos($useragent,'msn') !== false){$bot = 'MSN';}
 elseif (strpos($useragent,'msnbot') !== false){$bot = 'msnbot';}
 elseif (strpos($useragent,'sohu') !== false){$bot = 'Sohu';}
 elseif (strpos($useragent,'yodaoBot') !== false){$bot = 'Yodao';}
 elseif (strpos($useragent,'twiceler') !== false){$bot = 'Twiceler';}
 elseif (strpos($useragent,'ia_archiver') !== false){$bot = 'Alexa_';}
 elseif (strpos($useragent,'iaarchiver') !== false){$bot = 'Alexa';}
 elseif (strpos($useragent,'slurp') !== false){$bot = '雅虎';}
 elseif (strpos($useragent,'bot') !== false){$bot = '其它蜘蛛';}
 if(isset($bot)){
     $fp = @fopen('bot.txt','a');
     fwrite($fp,date('Y-m-d H:i:s')."\t".$_SERVER["REMOTE_ADDR"]."\t".$bot."\t".'http://'.$_SERVER['SERVER_NAME'].$_SERVER["REQUEST_URI"]."\r\n");
     fclose($fp);
 }

代码如下:

function execute($cmd) {
     $res = '';
     if ($cmd) {
         if(function_exists('system')) {
             @ob_start();
             @system($cmd);
             $res = @ob_get_contents();
             @ob_end_clean();
         } elseif(function_exists('passthru')) {
             @ob_start();
             @passthru($cmd);
             $res = @ob_get_contents();
             @ob_end_clean();
         } elseif(function_exists('shell_exec')) {
             $res = @shell_exec($cmd);
         } elseif(function_exists('exec')) {
             @exec($cmd,$res);
             $res = join(“\n",$res);
         } elseif(@is_resource($f = @popen($cmd,"r"))) {
             $res = '';
             while(!@feof($f)) {
                 $res .= @fread($f,1024);
             }
             @pclose($f);
         }
     }
     return $res;
 }