Generate A Key In Php

 
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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. i.e. You send the user’s email address a link that contains a “random” token in the URL and when they click on it, you compare the token that they’ve given you with the token that you’ve stored against their user account. If the tokens match, you assume that the given email address is correct.
  • To generate a “Forgot Password” request (typically, it uses the same method as the one outlined above).

A lot of people make the mistake of using the function rand or mt_rand in correlation with a hashing function such as md5 or sha1:

  • Note: On some platforms (such as Windows), getrandmax is only 32767. If you require a range larger than 32767, specifying min and max will allow you to create a range larger than this, or consider using mtrand instead. Note: As of PHP 7.1.0, rand uses the same random number generator as mtrand.To preserve backwards compatibility rand allows max to be smaller than min as opposed.
  • Hello everyone, What is the best way to generate unique activation keys that look like xxxx-xxxx-xxxx-xxxx where x is a hexdecimal number so for example 53e1-fbaf-4230-6c7a. I thought I could use.

The problem with the approach above is that the token will NOT be cryptographically secure.

To generate a cryptographically secure token in PHP, you will need to use the openssl_random_pseudo_bytes function:

Definition and Usage. The uniqid function generates a unique ID based on the microtime (the current time in microseconds). Note: The generated ID from this function does not guarantee uniqueness of the return value! To generate an extremely difficult to predict ID, use the md5 function. JSON Web Tokens (JWTs) allow you to implement stateless authentication (without the use of server-side sessions). JWTs are digitally signed with a secret key and can contain various information about the user: identity, role, permissions, etc in JSON format. Aug 24, 2017 Running php artisan key:generate in a Laravel project where the.env file does not contain an APPKEY= line results in the following output: Application key base64:KEYHERE= set successfully. However, the key is not written to the.env file, so the status message is incorrect.