![]() Here's my final version of a GUIDv4 function (based on others work here) that should work on all platforms and gracefully fallback to less cryptographically secure version if others are not supported. Im trying to make a UUID which will appear in this format: 32321-65631-43546-54542 (the numbers of course, will vary) I know how to make a uniqid id, but dont know where to start with this. Possible Duplicate: PHP function to generate v4 UUID I've been looking all over the web for this. Databases aren't obsolete just because your app can get away with storing some info in a flat text file.Getting Started Introduction A simple tutorial Language Reference Basic syntax Types Variables Constants Expressions Operators Control Structures Functions Classes and Objects Namespaces Enumerations Errors Exceptions Fibers Generators Attributes References Explained Predefined Variables Predefined Exceptions Predefined Interfaces and Classes Predefined Attributes Context options and parameters Supported Protocols and Wrappers Security Introduction General considerations Installed as CGI binary Installed as an Apache module Session Security Filesystem Security Database Security Error Reporting User Submitted Data Hiding PHP Keeping Current Features HTTP authentication with PHP Cookies Sessions Dealing with XForms Handling file uploads Using remote files Connection handling Persistent Database Connections Command line usage Garbage Collection DTrace Dynamic Tracing Function Reference Affecting PHP's Behaviour Audio Formats Manipulation Authentication Services Command Line Specific Extensions Compression and Archive Extensions Cryptography Extensions Database Extensions Date and Time Related Extensions File System Related Extensions Human Language and Character Encoding Support Image Processing and Generation Mail Related Extensions Mathematical Extensions Non-Text MIME Output Process Control Extensions Other Basic Extensions Other Services Search Engine Extensions Server Specific Extensions Session Extensions Text Processing Variable and Type Related Extensions Web Services Windows Only Extensions XML Manipulation GUI Extensions Keyboard Shortcuts ? This help j Next menu item k Previous menu item g p Previous man page g n Next man page G Scroll to bottom g g Scroll to top g h Goto homepage g s Goto search 1 This question already has answers here: Closed 11 years ago. If you personally don't need that standard, then it's not useful for you, and never has been. There's a reason why UUIDs are a standard, and what that standard isn't "slam 16 random bytes together and go home". The exact number of possibilities is about ²¹². ![]() Thereâs still a chance that a UUID could be duplicated but itâs tiny because of the high number of possible combinations. Every bit of the string is totally randomly generated. So sure, it'd be accurate to say "in many cases you can just do bin2hex(random_bytes(16)) to get a kinda UUID-ish string instead of generating a proper v4 UUID". This version uses a pseudo-random number generator to generate the UUID. (Although if so, I think you may want to rethink some bits of your design!) ramsey / uuid Public Code Issues 14 Pull requests 2 Actions Security Insights 4.x 3 branches 84 tags Code dependabot bot chore (deps): bump codecov/codecov-action from 3.1.3 to 3.1.4 6f6cee9 2 weeks ago 1,268 commits. And as a bonus, maybe those extra 6 bits of entropy are somehow critical to your application. GitHub - ramsey/uuid: A PHP library for generating universally unique identifiers (UUIDs). ![]() ![]() This algorithm generates a random 128-bit number, which is then formatted as a string of hexadecimal characters in a specific format (xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx). One common type is v4, which is, yes, 16 bytes long and has 122 bits of entropy, and yes, you could easily replace that with 16 bytes of randomness if you have no particular desire to follow a standard, interact with systems that are expecting actual v4 UUIDs, include any sort of versioning info, and have no need for some of the niceties (type hinting, etc.) that a good UUID library provides. A random UUID generator is an online software tool that generates universally unique identifiers using a variant of the random algorithm specified in RFC 4122. There are several different types of UUIDs. Pure PHP UUID generator Raw demo.php
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