利用php教程的http_referer函数来判断用户的来路,这是简单了,
实例
if (isset($_SERVER['HTTP_REFERER'])) {
print "The page you were on previously was {$_SERVER['HTTP_REFERER']}
";
} else {
print "You didn't click any links to get here
";
}
?>Click me!
下面我们让用户不知道我们的来路处理
实例
]$host = "www.123cha.com";
$referer = "http://".$host;
$fp = fsockopen ($host, 80, $errno, $errstr, 30);
if (!$fp){
echo "$errstr ($errno)
;n";
}else{
$request = "
GET / HTTP/1.1
Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-powerpoint, application/vnd.ms-excel, application/msword, */"."*
Referer: http://$host
Accept-Language: zh-cn
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)
Host: $host
Connection: Close"
."rnrn";
fputs ($fp, "$request");
while (!feof($fp))
{
$res[] = fgets($fp,1024);
}
$html = join("",$res);
fclose ($fp);
$fp = file_put_contents("123cha.html",$html);
echo "done";
}[/code]这不就行了?
不过很奇怪的是,
www.hao123.com
的页面抓下来是乱码(除了http头),这是为什么?难道是因为用了gzip之类压缩?[code]$host = "www.zhutiai.com";
$html = file_get_contents("http://".$host);
$fp = file_put_contents("hao123.html",$html);
echo "done";
?>;[/code]
但这样抓的就没问题.
再来分析开始抓的http头
[code]HTTP/1.1 200 OK Date: Wed, 31 Aug 2005 00:59:36 GMT Server: Apache/1.3.27 Cache-Control: max-age=1296000 Expires: Thu, 15 Sep 2005 00:59:36 GMT Last-Modified: Mon, 29 Aug 2005 13:56:00 GMT Accept-Ranges: bytes Connection: close Content-Type: text/html Content-Encoding: gzip Content-Length: 14567[/code]
果然有这句,Content-Encoding: gzip
原来压缩了的,长度14567字节了,
用第二种方法抓,原来没压缩的html是71143字节,原来file_get_contents还可以自动解压缩.
实例二
$host = '127.0.0.1';
$target = '/2.php';
$referer = 'http://www.bkjia.com'; //伪造HTTP_REFERER地址
$fp = fsockopen($host, 80, $errno, $errstr, 30);
if (!$fp){
echo "$errstr($errno)
n";
}
else{
$out = "
GET $target HTTP/1.1
Host: $host
Referer: $referer
Connection: Closernrn";
fwrite($fp, $out);
while (!feof($fp)){
echo fgets($fp, 1024);
}
fclose($fp);
}
?>
另一个2.php文件很简单,只是写上一行读取当前的HTTP_REFERER服务器值的代码即可,如下:
echo "
";
echo $_SERVER["HTTP_REFERER"];
?>

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。


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