Get Unique web browser ID in PHP
I am looking a way to store unique ID of web browsers in PHP ? I searched everywhere..but couldn’t find any useful things. First of all, does web browsers have a unique ID or something like that to identify them. Like the computers have a unique IP address, does browsers have anything like that?? I am trying this so that I can store user details into my database. So, we can find out a user used which browser to access my PHP website. Can I store such an ID to a php variable?
for example, $x= ID of the web browser.
Answers
When a user visits your site you know his IP, browser, OS and other stuff. You need to know if the next time the same user visits you (same IP, same login perhaps) is using the same browser. This can be achieved in two ways:
a) Create a cookie, store it in the browser and in your DB, then compare every visitor that has that cookie against your existing cookie table to identify him. If the cookie has a very long expiration time it won’t be lost across sessions, and will be unique to each browser. But it will be lost if the user clears cookies.
b) Store a string in the browser’s local storage. This works pretty much the same as the cookie method but there’s no expiration date for the data, and it’s thougher to remove it than to clear cookies.
There are other methods, like combining different kind of cookies to provide redundancy. I remember a project called Evercookie that did something like that. I believe it’s pretty much abandoned now.
string uniqid ([ string $prefix [, bool $more_entropy ]] ) Gets a prefixed unique identifier based on the current time in microseconds.
USAGE: $id = uniqid(rand(), true); Safari recently shipped the level 4 version of :not() , which allows complex selectors for arguments, putting it on par with jQuery’s hitherto non-standard implementation. See the release notes. The current incarnation of :not() only allows a single simple selector for an argument, so a complex selector like p div will not work in today’s browsers by design.
A complex selector is an expression consisting of one or more compound selectors separated by combinators such as descendant, > , ~ and + . A compound selector is a sequence of one or more simple selectors. div is a compound selector consisting of one simple selector, and p div is a complex selector consisting of two compound selectors (each of which consists of one simple selector), separated by a descendant combinator.
It is currently not known when this will land in the other browsers, though it’s unlikely the new specification of :not() will change at this point — the current level 4 definition is a no-brainer and if the original WebKit strain is daring enough to implement it, then it’s really only a matter of time before it makes its way into the other strains (including Blink).
After almost five grueling years of waiting since the FPWD, we might actually finally get to see a CR of selectors-4 real soon. Consider me pumped.
Как получить уникальный номер браузера?
Как получить уникальный идентификатор устройства (планшета)?
Как получить уникальный идентификатор устройства(планшета)? Подскажите готовое решение, пожалуйста.
Как получить уникальный номер ПК?
Здравствуйте! Хочу сделать какую-то простую привязку к ПК. Попробовал достать Mac адрес -.
Как вывести уникальный номер ПК?
Здравствуйте! Хочу привязать программу к ПК, но для этого нужно что бы программа выдавала.
Как считать уникальный 64бит. номер датчика DS18B20
Добрый день. Подскажите, как прочитать уникальный код датчика DS18B20. Что делаю я: 1) Создаю.
Сообщение от bazile
Это называется супер-кукисы, в них используется не идентификатор роузера, а идентификатор активХ WMP. В чём весь прикол я понять не могу, ведь этот «уникальный номер» можно свободно нати и изменить в реестре,притов виндоус и ни словом не обмолвится о том, что ты что-то нарушаешь.
Я знаю супер-кукисы всегда используют в связке с другими возможностями проидентифицировать пользователя, обычно задействуетются обычные кукисы, супер кукисы, логин , ip, так же можно взять маску подсети. Сам по себе каждый из вариантов не представляет интереса, только в сязке можно на 95% процентов скзаать, что определённому человеку закрыт доступ на сайт.
Как узнать GUID уникальный номер жёсткого диска и процессора
Прет всем, мне нужно узнать GUID-номер жёсткого диска и процессора в С#. который день уже.
Как получить уникальный ID
Здравствуйте, нужно получать подряд ID(0, . n, n+1) для объектов, если объект был удалён, то ID.
Как получить уникальный идентификатор сеанса
1) Как получить уникальный идентификатор СЕАНСА 2) И правильно ли будет хранить этот идентификатор.
Php – Get Unique web browser ID in PHP
I am looking a way to store unique ID of web browsers in PHP ? I searched everywhere..but couldn’t find any useful things. First of all, does web browsers have a unique ID or something like that to identify them. Like the computers have a unique IP address, does browsers have anything like that?? I am trying this so that I can store user details into my database. So, we can find out a user used which browser to access my PHP website. Can I store such an ID to a php variable?
for example, $x= ID of the web browser.
Best Solution
When a user visits your site you know his IP, browser, OS and other stuff. You need to know if the next time the same user visits you (same IP, same login perhaps) is using the same browser. This can be achieved in two ways:
a) Create a cookie, store it in the browser and in your DB, then compare every visitor that has that cookie against your existing cookie table to identify him. If the cookie has a very long expiration time it won’t be lost across sessions, and will be unique to each browser. But it will be lost if the user clears cookies.
b) Store a string in the browser’s local storage. This works pretty much the same as the cookie method but there’s no expiration date for the data, and it’s thougher to remove it than to clear cookies.
There are other methods, like combining different kind of cookies to provide redundancy. I remember a project called Evercookie that did something like that. I believe it’s pretty much abandoned now.
Related Solutions
Html – How to disable browser autocomplete on web form field / input tags
Firefox 30 ignores autocomplete=»off» for passwords, opting to prompt the user instead whether the password should be stored on the client. Note the following commentary from May 5, 2014:
- The password manager always prompts if it wants to save a password. Passwords are not saved without permission from the user.
- We are the third browser to implement this change, after IE and Chrome.
According to the Mozilla Developer Network documentation, the Boolean form element attribute autocomplete prevents form data from being cached in older browsers.
Php – How to prevent SQL injection in PHP
The correct way to avoid SQL injection attacks, no matter which database you use, is to separate the data from SQL, so that data stays data and will never be interpreted as commands by the SQL parser. It is possible to create SQL statement with correctly formatted data parts, but if you don’t fully understand the details, you should always use prepared statements and parameterized queries. These are SQL statements that are sent to and parsed by the database server separately from any parameters. This way it is impossible for an attacker to inject malicious SQL.
You basically have two options to achieve this:
- Using PDO (for any supported database driver):
$stmt = $pdo->prepare('SELECT * FROM employees WHERE name = :name'); $stmt->execute([ 'name' => $name ]); foreach ($stmt as $row) < // Do something with $row > $stmt = $dbConnection->prepare('SELECT * FROM employees WHERE name = ?'); $stmt->bind_param('s', $name); // 's' specifies the variable type => 'string' $stmt->execute(); $result = $stmt->get_result(); while ($row = $result->fetch_assoc()) < // Do something with $row > If you’re connecting to a database other than MySQL, there is a driver-specific second option that you can refer to (for example, pg_prepare() and pg_execute() for PostgreSQL). PDO is the universal option.
Correctly setting up the connection
Note that when using PDO to access a MySQL database real prepared statements are not used by default. To fix this you have to disable the emulation of prepared statements. An example of creating a connection using PDO is:
$dbConnection = new PDO('mysql:dbname=dbtest;host=127.0.0.1;charset=utf8', 'user', 'password'); $dbConnection->setAttribute(PDO::ATTR_EMULATE_PREPARES, false); $dbConnection->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); In the above example the error mode isn’t strictly necessary, but it is advised to add it. This way the script will not stop with a Fatal Error when something goes wrong. And it gives the developer the chance to catch any error(s) which are throw n as PDOException s.
What is mandatory, however, is the first setAttribute() line, which tells PDO to disable emulated prepared statements and use real prepared statements. This makes sure the statement and the values aren’t parsed by PHP before sending it to the MySQL server (giving a possible attacker no chance to inject malicious SQL).
Although you can set the charset in the options of the constructor, it’s important to note that ‘older’ versions of PHP (before 5.3.6) silently ignored the charset parameter in the DSN.
Explanation
The SQL statement you pass to prepare is parsed and compiled by the database server. By specifying parameters (either a ? or a named parameter like :name in the example above) you tell the database engine where you want to filter on. Then when you call execute , the prepared statement is combined with the parameter values you specify.
The important thing here is that the parameter values are combined with the compiled statement, not an SQL string. SQL injection works by tricking the script into including malicious strings when it creates SQL to send to the database. So by sending the actual SQL separately from the parameters, you limit the risk of ending up with something you didn’t intend.
Any parameters you send when using a prepared statement will just be treated as strings (although the database engine may do some optimization so parameters may end up as numbers too, of course). In the example above, if the $name variable contains ‘Sarah’; DELETE FROM employees the result would simply be a search for the string «‘Sarah’; DELETE FROM employees» , and you will not end up with an empty table.
Another benefit of using prepared statements is that if you execute the same statement many times in the same session it will only be parsed and compiled once, giving you some speed gains.
Oh, and since you asked about how to do it for an insert, here’s an example (using PDO):
$preparedStatement = $db->prepare('INSERT INTO table (column) VALUES (:column)'); $preparedStatement->execute([ 'column' => $unsafeValue ]); Can prepared statements be used for dynamic queries?
While you can still use prepared statements for the query parameters, the structure of the dynamic query itself cannot be parametrized and certain query features cannot be parametrized.
For these specific scenarios, the best thing to do is use a whitelist filter that restricts the possible values.
// Value whitelist // $dir can only be 'DESC', otherwise it will be 'ASC' if (empty($dir) || $dir !== 'DESC')
Get Unique web browser ID in PHP
When a user visits your site you know his IP, browser, OS and other stuff. You need to know if the next time the same user visits you (same IP, same login perhaps) is using the same browser. This can be achieved in two ways:
a) Create a cookie, store it in the browser and in your DB, then compare every visitor that has that cookie against your existing cookie table to identify him. If the cookie has a very long expiration time it won’t be lost across sessions, and will be unique to each browser. But it will be lost if the user clears cookies.
b) Store a string in the browser’s local storage. This works pretty much the same as the cookie method but there’s no expiration date for the data, and it’s thougher to remove it than to clear cookies.
There are other methods, like combining different kind of cookies to provide redundancy. I remember a project called Evercookie that did something like that. I believe it’s pretty much abandoned now.
Smokey
A software professional with 5.3 years of diverse experience in Software Development.
Comments
I am looking a way to store unique ID of web browsers in PHP ? I searched everywhere..but couldn’t find any useful things. First of all, does web browsers have a unique ID or something like that to identify them. Like the computers have a unique IP address, does browsers have anything like that?? I am trying this so that I can store user details into my database. So, we can find out a user used which browser to access my PHP website. Can I store such an ID to a php variable? for example, $x= ID of the web browser.