php form spam prevention

　　PHP Hash Prevention Form

In the market economy, the contradictions in the field of information security are particularly prominent. Viruses and anti-virus, hackers and anti-hackers, spam and anti-spam messages are always intertwined, and this is a long way to push the safety industry wheels forward. With the continuous application of cloud computing and virtual technology, spam Mail has

number of spam comments are found to be Chinese, you can use a small wall tool written by Willin Kan, which theoretically shields spam sent by robots by 100%. if the comment is submitted by a natural person, Xiaoqiang adds a hidden variable to the comment submission form. if this variable is not detected in the background, the variable is identified as

HTTP attack and PHP security configuration prevention 1. What is security? The so-called security means to protect web applications and webpages from hacker attacks. Some hackers intrude into others' computers purely for fun, but more hackers are struggling to steal confidential files from others' computers, or even paralyze the entire computer to achieve his goal. There are a lot of software on the Interne

Introduction to forged cross-station requests The forgery of cross station requests is more difficult to guard against, and the harm is great, in this way attackers can play pranks, send spam information, delete data, and so on. Common manifestations of this attack are:Forge links, entice users to click, or let the user unknowingly accessForge forms and entice users to submit them. The form can be hidden,

Text/graph non-zero solution Zhou LinCurrently, PHP security has become a hot topic in the PHP field. To ensure that scripts are safe, you must start with the most basic-input filtering and secure output. If you do not fully perform these basic tasks, your scripts will always have security issues. This article will discuss the prevention of SQL Injection for

%3Ealert (' hacked ')%3c/script%3eThe contents of the form will then become:Then it executes the JS code that is added later.2.2 Input in form Add script statementIf you add a script statement to a form that fills in the content. If we do not do the processing, but also on the Web page with Echo Direct output will be in our web page, so for the data submitted fro

/test_form.php/%22%3E%3Cscript%3Ealert (' hacked ')%3c/script%3eThe contents of the form will then become:Then you will run the JS code that is added later.2.2 Input in form Add script statementSuppose you add a script statement to a form that fills in the content.If we do not do the processing, but also on the Web page with Echo Direct output will be in our web

PHP Security-file system security and prevention measures PHP complies with the security mechanisms of most server systems regarding file and directory permissions. This allows the administrator to control which files are readable in the file system. You must pay special attention to the global readable files and ensure that each user with permissions can read th

Introduction to forged cross-station requests The forgery of cross station requests is more difficult to guard against, and the harm is great, in this way attackers can play pranks, send spam information, delete data, and so on. Common manifestations of this attack are: Forge links, entice users to click, or let the user unknowingly access Forge forms and entice users to submit them. The form can be hidden,

on, as in the previous example, or else two repetitions will go wrong. If MQ is enabled, we have to add the \ minus to get the real data. In addition to preprocessing the data in the above-mentioned string form, you should also pay attention to preprocessing when storing binary data into the database. Otherwise, the data may conflict with the storage format of the database itself, causing the database to crash, data records to be lost, and even the e

Phpsession hijacking and prevention methods. Session Data exposure session data usually contains personal information and other sensitive data. For this reason, session data exposure is a common concern. In general, the exposed Session Data exposureSession Data usually contains personal information and other sensitive data. For this reason, session data exposure is a common concern. In general, the exposure scope is not very large, because session dat

static page after the activity ends, Inform the routing server that it is not routed to this server (this is worth discussing ). M/n * (1 + 0.1) people who come in from all product servers will be forwarded to one payment server. when the payment process starts, the number of people will be small, locking is simple. Solution 3: Use the Memcache lock to implement a single server. Product_key is the key of the ticket Product_lock_key is the ticket lock key. When product_key exists in memcached,

versions of Internet Explorer, when a user accesses a webpage and refreshes a webpage, the Accept header information is different, so the accept header cannot be used to judge consistency. It is true that User-agent header information is consistent, but if the session ID is passed through a cookie (recommended way), it makes sense that if an attacker can obtain a session ID, he can also get other HTTP headers. Because cookie exposure is related to browser vulnerabilities or cross-site scripting

all forwarded to a payment server, into the payment link, see who deft on hand, at this time less people, plus lock what is simple. scenario Three, if it is a single server, you can use the Memcache lock to achieve Product_key key for the ticket Product_lock_key for ticket lock key when Product_key is present in memcached, all users can enter the order process. when entering the payment process, first store add (Product_lock_key, "1″") to Memcached, If the return succeeds, enter the p

, into the payment link, see who deft on hand, at this time less people, plus lock what is simple.Scenario three, if it is a single server, you can use the memcache lock to achieveProduct_key Key for the ticketProduct_lock_key for Ticket lock keyWhen Product_key is present in memcached, all users can enter the order process.When entering the payment process, first store add (Product_lock_key, "1″") to memcached,If the return succeeds, enter the payment process.If not, it means that someone has e

, into the payment link, see who deft on hand, at this time less people, plus lock what is simple.Scenario three, if it is a single server, you can use the memcache lock to achieveProduct_key Key for the ticketProduct_lock_key for Ticket lock keyWhen Product_key is present in memcached, all users can enter the order process.When entering the payment process, first store add (Product_lock_key, "1″") to memcached,If the return succeeds, enter the payment process.If not, it means that someone has e

, into the payment link, see who deft on hand, at this time less people, plus lock what is simple.Scenario three, if it is a single server, you can use the memcache lock to achieveProduct_key Key for the ticketProduct_lock_key for Ticket lock keyWhen Product_key is present in memcached, all users can enter the order process.When entering the payment process, first store add (Product_lock_key, "1″") to memcached,If the return succeeds, enter the payment process.If not, it means that someone has e

Php implements the method of filtering html tags in form submission. Php implements the method of filtering html tags in form submission. This document describes how php implements the method of filtering html tags in form submiss

Php simple method of handling form input special characters, form special characters This article describes a simple way for PHP to handle special characters of form input. Share to everyone for your reference, as follows: "; ? >try again More readers interested in