PHP provides the popular md5() hash function out of the box, which returns 32 a hex character string. It’s a great way to generate a fingerprint for any arbitrary length string. But what if you need to generate an integer fingerprint out of a URL?
This is a short guide on how to generate a random token with PHP. These kind of tokens are used for a number of different reasons: To protect against Cross-Site Request Forgery. These are often referred to as CSRF tokens. To help verify a user’s email address. You send the user’s email address a link that contains a “random” token.
Challenge
We faced that challenge in RatingWidget when we had to bind our rating widgets to a unique Int64 IDs based on the website’s page it’s being loaded from. Theoretically we could just store the URLs and query the URL column, but URLs can be very long and creating an index for text column with unknown length is very inefficient.
So if you are working on any kind of dynamic widget development that should load different data based on the URL it’s loaded from, this post will save you tonnes of time.
To simplify the problem, let’s divide it into two sub-challenges:
![Php generate key from string notes Php generate key from string notes](/uploads/1/2/5/7/125758003/190996352.png)
- URL Canonization
- String to unique Int64 conversion
Generate Key Code
URL Canonization
In our case, we wanted to assign a unique Int64 for a page, not for a URL. For instance,
http://domain.com?x=1&y=2
and http://domain.com?y=2&x=1
are different URLs but in fact both of them will load the exact same page. Therefore, we wanted to assign them an identical Int64 ID. Thus, by canonizing the URLs before mapping them to Int64, we can convert the URLs to uniform representation.Basically what this code does is reorder the query string parameters by lexicographical order, and slightly tweak the URL encoding based on RFC 3986 URI syntax standard, to compensate for the different browsers + server URL encoding inconsistency.
Notes:
- In our case canonizeUrl, the canonization function, gets rid of the protocol. So
https://domain.com
andhttp://domain.com
are both canonized todomain.com
because we wanted to show the same rating widget on HTTP and HTTPS equivalent pages. - As you can notice, we also ignore everything the after hashmark fragment. Therefore, if you would like to generate unique IDs for SPA (Single Page Application) different states like
http://my-spa.com/#state1
andhttp://my-spa.com/#state2
, the URL canonization function has to be modified to support that.
Converting String to unique Int64 ID for MySql BIGINT Indexed Column
After fooling around with various bit conversion functions like
bindec()
, decbin()
, base_convert()
. We have found out that 64 bit integers and PHP are not playing well. None of the mentioned functions consistently supports 64 bit. After digging around on Google, we were lead to a post about 32 bit limitations in PHP which included the suggestion to use GMP, a really cool library for multiple precision integers. Using this library, we managed to create this one line hash function that generates a 64 bit integer out of arbitrary length string.Post factum, we could have implemented the CRC64 algorithm which generates a string checksum and should perform faster than MD5. But the advantage of the technique we’ve used over CRC is that we’ve created a one-way-hash function, so we can reuse it for various cryptography purposes in the code.
To find out more about GMP, see here.
Grand Finale
Combining the URL canonization with the String to Int64 mapping, the final solution looks like this:
Collision and Performance Test of get64BitHash
Platform: Intel i3, Windows 7 64 bit, PHP 5.3
Iterations: 10,000,000 Times generated get64BitHash
Elapsed Time: 460 millisecond for every 100,000 generations
Collision: Not found
Iterations: 10,000,000 Times generated get64BitHash
Elapsed Time: 460 millisecond for every 100,000 generations
Collision: Not found
Summary
I hope this straightforward solution will save you time on your next project. If you have comments or any additional use-cases where this technique can be applied, please feel free to comment below.
Based on your input, get a random alpha numeric string. The random string generator creates a series of numbers and letters that have no pattern. These can be helpful for creating security codes.
With this utility you generate a 16 character output based on your input of numbers and upper and lower case letters. Random strings can be unique. Used in computing, a random string generator can also be called a random character string generator. This is an important tool if you want to generate a unique set of strings. The utility generates a sequence that lacks a pattern and is random.
Nov 18, 2019 MS Office 365 Product Key Generator & Latest Activator 2020 Upto 2050 About MS Office 365 Licensed Up to 5 household members can use office 365 Home with just one subscription. Feb 05, 2020 A key generator is an online software where you can create the MS office 365 activation key for any applications of Microsoft. The main advantages of the product key of MS office 365: You can easily map a chart with your colleagues in your working station. Microsoft Office 365 Product Key Generator used for activation of Microsoft Office product full version free. Microsoft Office is the complete product that developed by Microsoft corporation. Microsoft Office 365 Product Key is a complete all-in-one package of tools that support to make office full version to use its all features easily and freely. Jan 14, 2020 Though request creators employ different choices to make this occur goal, one conventional process involves seeking somebody to enter something necessary or consecutive sum, this is the fact for equally Microsoft Windows Microsoft Office 365 Product Key Generator. Microsoft Office 365 Crack is an essential service that provides you entry with a Microsoft tools. It provides some other devices on the Microsoft Office 2016 (Pro Plus) and Office 365 portal. Windows 10 microsoft office 365 product key generator.
Throughout time, randomness was generated through mechanical devices such as dice, coin flips, and playing cards. A mechanical method of achieving randomness can be more time and resource consuming especially when a large number of randomized strings are needed as they could be in statistical applications. Computational random string generators replace the traditional mechanical devices.
Possible applications for a random string generator could be for statistical sampling, simulations, and cryptography. For security reasons, a random string generator can be useful.
The generation of this type of random string can be a common or typical task in computer programming. Some forms of randomness concern hash or seach algorithms. Another task that is random concerns selecting music tracks.
The movies serial key generator. In statistical theory, randomization is an important principle with one possible application involving survey sampling.
Xjz survey remover key!! Xjz survey remover key working 100% sith proof!!! XJZ SURVEY REMOVER KEy. XJZ SURVEY REMOVER Permission KEY FREE. Labels: permission key, working 100%, Xjz survey remover permission key. Subscribe to: Posts (Atom) Pageviews Today!! Ethereal theme.
There is a XJZ Survey Remover addon which works for Google Chrome 6+ The addon needs to be activated before it can be used. To activate the addon you need to get a permission key, which in most cases, requires a donation to the XJZ Survey Remover project.
Php String Functions
Many applications of randomization have caused several methods to exist for generating random data. Lottery games is one current application. Slot machine odds are another use of random number generators.