What Does Your User Agent Say About You?


A user agent is a computer program representing a person, for example, a browser in a Web context.

Besides a browser, a user agent could be a bot scraping webpages, a download manager, or another app accessing the Web. Along with each request they make to the server, browsers include a self-identifying User-Agent HTTP header called a user agent (UA) string. This string often identifies the browser, its version number, and its host operating system.

Spam bots, download managers, and some browsers often send a fake UA string to announce themselves as a different client. This is known as user agent spoofing.

The user agent string can be accessed with JavaScript on the client side using the navigator.userAgent property.

A typical user agent string looks like this: "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:35.0) Gecko/20100101 Firefox/35.0".


User Agent String

Browser Data

Get User Agent Php

David Lawrence
• Friday, 30 July, 2021
• 11 min read

Php function getUseragent() {EU_ agent = $_SERVER; name = 'Unknown'; platform = 'Unknown'; version = “"; //First get the platform? If (prey_match('/Linux/i', EU_ agent)) {platform = 'Linux';} else if (prey_match('/Macintosh|ma cos x/i', EU_ agent)) {platform = 'mac';} else if (prey_match('/windows|win32/i', EU_ agent)) {platform = 'windows';} if (prey_match('/MSI/i', EU_ agent) & !prey_match('/Opera/i', EU_ agent)) {name = 'Internet Explorer'; pub = “MSI”;} else if (prey_match('/Firefox/i', EU_ agent)) {name = 'Mozilla Firefox'; pub = “Firefox”;} else if (prey_match('/Chrome/i', EU_ agent)) {name = 'Google Chrome'; pub = “Chrome”;} else if (prey_match('/Safari/i', EU_ agent)) {name = 'Apple Safari'; pub = “Safari”;} else if (prey_match('/Opera/i', EU_ agent)) {name = 'Opera'; pub = “Opera”;} else if (prey_match('/Netscape/i', EU_ agent)) {name = 'Netscape'; pub = “Netscape”;} else {name = 'Internet Explorer'; pub = “MSI”;} // To get correct version number known = array('Version', pub, 'other'); pattern = '#(?'.



How to validate mandatory post parameters in a CodeIgniter rest API How to connect to MySQL database on another server using PHP About Author Jegadeesh from Tamil Nadu (India).

I have been working as a software engineer from last 5+ years, Very much interested in surfing internet and exploring new things. Anonymous ¶ Follow up to Francesco R's post from 2016. His function works for most human traffic; added a few lines to cover the most common bot traffic.

Also fixed issue with function failing to detect strings at position 0 due to strops behavior. Ruudrp at live dot NL ¶ To my surprise I found that none of the get _browser alternatives output the correct name / version combination that I was looking for using Opera or Chrome.

They either give the wrong name e.g. Safari when in fact it should be Chrome and if the UA string includes a version number as with the latest versions of Chrome and Opera the wrong number is reported. So I took bits and pieces from the various examples and combined them and added a check for version.

“;} return array('sergeant' EU_ agent,'name' name,'version' version,'platform' platform,'pattern' pattern);} UA=browser();$yourbrowser= “Your browser: ". Francesco R ¶ If you ONLY need a very fast and simple function to detect the browser name (update to May 2016):function get _browser_name($ user _ agent){ if (strops($ user _ agent, 'Opera') || strops($ user _ agent, 'Or/')) return 'Opera'; else if (strops($ user _ agent, 'Edge')) return 'Edge'; else if (strops($ user _ agent, 'Chrome')) return 'Chrome'; else if (strops($ user _ agent, 'Safari')) return 'Safari'; else if (strops($ user _ agent, 'Firefox')) return 'Firefox'; else if (strops($ user _ agent, 'MSI') || strops($ user _ agent, 'Trident/7')) return 'Internet Explorer'; return 'Other';}echo get _browser_name($_SERVER);?>This function also resolves the trouble with Edge (that contains in the user agent the string “Safari” and “Chrome”), with Chrome (contains the string “Safari”) and IE11 (that do not contain 'MSI' like all other IE versions). Note that “strops” is the fastest function to check a string (far better than “prey_match”) and Opera + Edge + Chrome + Safari + Firefox + Internet Explorer are the most used browsers today (over 97%).

user agent browser parse string useragent parser

The latest version of PHP has a performance fix for this function. Jeff Williams ¶ To automatically update your browscap.ini file on Linux servers, you can use this simple shell script:You can put it in the weekly cron job folder usually located in /etc/iron.weekly just don't forget to make the script executable (ch mod 775 script name).

Tim at digital dot DE ¶ Be aware that loading PHP _browscap.ini via the brows cap PHP .ini setting may consume a non-trivial amount of memory. Current versions are several MB in size (even the “lite” one) and can eat tens of MB of RAM in each PHP process.

I’d recommend comparing your processes’ memory consumption with and without PHP _browscap.ini being loaded. If necessary, consider creating your own stripped-down copy of PHP _browscap.ini with just the browsers that are important to you.

'UserAgent' EU_ agent,'name' name,'version' version,'platform' platform,'pattern' pattern);} UA=browser();$yourbrowser= “Your browser: ". Max at expert dot DE ¶ Be aware of the fact that this function shows what a specific browser might be able to show, but NOT what the user has turned on/off. So maybe this function tells you that the browser is Abel to JavaScript even when JavaScript is turned off by the user.

If (strops($ user _ agent, 'Trident/7.0; RV:')) {content_nav = 'Trident/7.0; RV:';} else if (strops($ user _ agent, 'Trident/7')) {content_nav = 'Trident/7';} else {content_nav = 'Opera';} Good practice would be to include HTML if-statements for IE stylesheets as well as dynamically checking the browser type.

user agent

P2 at eduardoruiz dot BS ¶ BE CAREFUL WITH THIS FUNCTION! ! This function uses a lot of CPU and RAM on the whole server resources. Perhaps if you use this function a few times then no problem, but NOT if you use at any page request, or once per session. Also, this function doesn't work correctly and may returns wrong values, wildcards or empty, so it's not very useful for web statistics.

You'll have to explain how you want to use the USER _ AGENT information if you need more than that. Quote from: Bob Ray at Jan 15, 2014, 11:11 PM You can just paste the code above into a snippet and put a tag for the snippet where you want to use the USER _ AGENT.

The problem is that the switch statement doesn't work that way. Quote from: Bob Ray at Jan 15, 2014, 11:55 PM Sorry, I wasn't thinking.

This is a small tutorial on how to use a custom Sergeant with curl in PHP. To set a custom Sergeant, we will need to make use of the CURLOPT_USERAGENT option.

In other cases, certain features will be disabled (in the past, I’ve come across errors about my browser being out of date). By setting a custom user agent, you can fool these servers into thinking that your curl request is coming from a legitimate up-to-date browser.

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As you can see, the possibilities are endless and you can pretty much fool any website that relies on the user agent ! This entry was posted in Code, PHP Tutorials by ThisInterestsMe.

The Sergeant Class provides functions that help identify information about the browser, mobile device, or robot visiting your site. The Sergeant class is always available directly from the current IncomingRequest instance.

By default, you will have a request instance in your controller that you can retrieve the Sergeant class from: When the Sergeant class is initialized it will attempt to determine whether the user agent browsing your site is a web browser, a mobile device, or a robot.

If you find that some bots that commonly visit your site are missing from the list you can add them to your app/Config/Reagents. GetBrowser () Returns:Detected browser or an empty stringReturn type:stringReturns a string containing the name of the web browser viewing your site.

GetVersion () Returns:Detected browser version or an empty stringReturn type:stringReturns a string containing the version number of the web browser viewing your site. GetMobile () Returns:Detected mobile device brand or an empty stringReturn type:stringReturns a string containing the name of the mobile device viewing your site.

agent user context contents change file didn qq weixin mp url number read

Built with Sphinx using a theme provided by Read the Docs. $_SERVER is an array containing information such as headers, paths, and script locations.

That said, many these variables are accounted for in the CGI/1.1 specification, so you should be able to expect those. Note that few, if any, of these will be available (or indeed have any meaning) if running PHP on the command line.

' PHP _SELF The filename of the currently executing script, relative to the document root. The __FILE__ constant contains the full path and filename of the current (i.e. included) file.

SERVER_PROTOCOL Name and revision of the information protocol via which the page was requested; e.g. HTTP/1.0 '; REQUEST_METHOD Which request method was used to access the page; e.g. GET ', ' HEAD ', POST ', PUT '. PHP's script is terminated after sending headers (it means after producing any output without output buffering) if the request method was HEAD.

DOCUMENT_ROOT The document root directory under which the current script is executing, as defined in the server's configuration file. ' Not all user agents will set this, and some provide the ability to modify HTTP_REFERER as a feature.


If a script is executed with the CLI, as a relative path, such as file. ' SERVER_ADMIN The value given to the SERVER_ADMIN (for Apache) directive in the web server configuration file.

For default setups, this will be 80 '; using SSL, for instance, will change this to whatever your defined secure HTTP port is. Note : Under the Apache 2, you must set UseCanonicalName = On, as well as UseCanonicalPhysicalPort = On in order to get the physical (real) port, otherwise, this value can be spoofed and it may or may not return the physical port value.

' SERVER_SIGNATURE String containing the server version and virtual host name which are added to server-generated pages, if enabled. ' PATH_TRANSLATED File system- (not document root-) based path to the current script, after the server has done any virtual-to-real mapping.

PATH_INFO Contains any client-provided path name information trailing the actual script filename but preceding the query string, if available. For instance, if the current script was accessed via the URL PHP /path_info.

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