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#PHP RANDOM PASSWORD GENERATOR HOW TO#
#PHP RANDOM PASSWORD GENERATOR CODE#

The problem with rand and mt_rand is that they are not cryptographically secure.

#PHP RANDOM PASSWORD GENERATOR CODE#

This made us wince, as they are essentially polluting “the PHP sphere” with insecure code when there are more secure and easy-to-use alternatives out there. One of the reasons that we wrote this tutorial is because we came across a number of similar guides that recommended the use of functions such as rand or mt_rand. Why did you use random_int instead of rand or mt_rand?

Finally, we return our randomly generated password.

Note that this works because characters in a PHP string can be accessed via their index, much like you would access an array element.

Inside this loop, we select a random character from our “keyspace” string by using the PHP function random_int.

The number of iterations that this loop does will match the number that was specified in the $length parameter.

After that, we created a foreach loop.

We then subtracted one from the size because indexes always start at 0.

Using the mb_strlen function, we calculated the index of the last character in the string.

However, you can modify this list to suit your own needs by adding or removing characters from the string. By default, we have set this to 0-9, a-z, A-Z and a few special characters at the end.

We created a string of all the characters that our function can use while generating the password.You can also use it to suggest a new secure password to the user. This kind of function is especially useful for creating one-time passwords (OTP) and other important tokens. The custom PHP function above will generate a random string and then return it.Īll you have to do is specify the length of the string by passing in the $length parameter. Loop from 1 to the $length that was specified. $characterListLength = mb_strlen($characters, '8bit') - 1 Get the index of the last character in our $characters string. $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!-.?*()' A list of characters that can be used in our * int $length The length that you want your random password to be. * A PHP function that will generate a secure random password. Take a look at the following function: /** To do this, we will be using the random_int function, which is cryptographically secure.

#PHP RANDOM PASSWORD GENERATOR HOW TO#

In this tutorial, we are going to show you how to generate a secure random password using PHP.