Jan 06, 2020 Generate unique random number in PHP. In this tutorial, we would love to share with you how to generate 2,4,6,10,12 digit unique random number in PHP. Generate unique random number in PHP. You can use the php rand and mtrand function to generate 2,4,6,10,12, etc digit unique random number in PHP. PHP rand function. Generate a random, unique, alpha-numeric string using PHP. Examples: EA070 aBX32gTf APPROACH 1: Brute Force The first approach is the simplest one to understand and thus brute force. As you can see, generating random and unique hexadecimal strings up to 40 characters long is very easy in PHP. Generate Cryptographically Secure Random Strings. The three functions to generate random alphanumeric strings that we have discussed so far are not cryptographically secure.
Jul 10, 2018 php sessionstart; $id=sessionid; if you just like to create a unique Id and store it in a session, use unique id, $SESSION'someid’=uniqid; this creates.
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:
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: