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A one-time URL is a specially crafted address that is valid for one use only. It’s usually provided to a user to gain privileged access to a file for a limited time or as part of a particular activity, such as user account validation. In this article I’ll show how to generate, implement, and expire one-time URLs.

Creating a URL

• A one-time URL is a specially crafted address that is valid for one use only. It’s usually provided to a user to gain privileged access to a file for a limited time or as part of a particular.
• Generate random questions php mysql free download. Invoices & Auto Reports by Email Php Invoices / Quotation & Auto Reports by Email php+mysql with the hability of read TXT lines and conve.

Let’s say we’ve been tasked with writing a user management component, and the project creates a record for a new user account in the database. After signing up, the user receives a confirmation email which provides a one-time URL to activate her account. We can make this URL one-time by including a tracked token parameter, which means the URL would look like this:

Not surprisingly, tracking the one-time URL is done by storing information in a database table. So, let’s start with the table definition:

The table stores the relevant username, a unique token, and a timestamp. I’ll be showing how to generate the token using the sha1() function, which returns a 40-character string, hence the capacity of the token field as 40. The tstamp field is an unsigned integer field used to store a timestamp indicating when the token was generated and can be used if we want to implement a mechanism by which the token expires after a certain amount of time.

There are many ways to generate a token, but here I’ll simply use the uniqid() and sha1() functions. Regardless of how you choose to generate your tokens, you’ll want them to be unpredictable (random) and a low chance of duplication (collision).

uniqid() accepts a string and returns a unique identifier based on the string and the current time in microseconds. The function also accepts an optional Boolean argument to add additional entropy to make the result more unique. The sha1() function calculates the hash of the given string using the US Secure Hash Algorithm 1.

Once the functions execute, we’ve got a unique 40-character string which we can use as our token to create the one-time URL. We’ll want to record the token along with the username and timestamp in the database so we can reference it later.

Obviously we want to store the token, but we also store the username to remember which user to set active, and a timestamp. In a real world application you’d probably store the user ID and reference a user record in a separate user table, but I’m using the username string for example’s sake.

With the information safely placed in the database, we can now construct our one-time URL which points to a script that receives the token and processes it accordingly.

The URL can be disseminated to the user either by email or some other means.

Consuming a URL

We need a script to activate the account once the user follows the link. Indeed, it’s the processing script that works that enforces the one-time use of the URL. What this means is the script will need to glean the token from the calling URL and do a quick check against the data stored in the database table. If it’s a valid token, we can perform whatever action we want, in this case setting the user active and expiring the token.

Going further, we could enforce a 24-hour TTL (time to live) for the URL buy checking the timestamp stored in the table alongside the token.

Working within the realm of Unix timestamps, the expiration date would be expressed as an offset in seconds. If the URL is only supposed to be valid for 24 hours, we have a window of 86,400 seconds. Determining if the link has expired then becomes a simple matter of comparing the current time with the original timestamp and see if the difference between them is less than the expiration delta. If the difference is greater than the delta, then the link should be expired. If the difference is less than or equal to the delta, the link is still “fresh.”

Conclusion

There are several applications for one-time use URLs. The example in this article was a scenario of sending a user a verification link to activate an account. You could also use one-time use URLs to provide confirmation for other activities, give time-sensitive access to information, or to create timed user accounts which expire after a certain time.

As a matter of general house keeping you could write a secondary script to keep expired tokens from accumulating in the database if a user never follows them. The script could be run periodically by an administrator, or preferably set up as a scheduled task or cron job and run automatically.

It would also be wise to take this functionality and wrap it up into a reusable component as you implemented it in your application. It’s trivial to do, and so I’ll leave that as an exercise to the reader.

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I know that the rand function in PHP generates random integers, but what is the best way to generate a random string such as:

Php Generate Random Key Every 60 Minutes Free

Original string, 9 chars

Example random string limiting to 6 chars

UPDATE: I have found tons of these types of functions, basically I’m trying to understand the logic behind each step.

UPDATE: The function should generate any amount of chars as required.

Please comment the parts if you reply.

Well, you didn’t clarify all the questions I asked in my comment, but I’ll assume that you want a function that can take a string of “possible” characters and a length of string to return. Commented thoroughly as requested, using more variables than I would normally, for clarity:

To call this function with your example data, you’d call it something like:

Note that this function doesn’t check for uniqueness in the valid chars passed to it. For example, if you called it with a valid chars string of 'AAAB', it would be three times more likely to choose an A for each letter as a B. That could be considered a bug or a feature, depending on your needs.

Answer：

If you want to allow repetitive occurences of characters, you can use this function:

The basic algorithm is to generate <length> times a random number between 0 and <number of characters> − 1 we use as index to pick a character from our set and concatenate those characters. The 0 and <number of characters> − 1 bounds represent the bounds of the $charset string as the first character is addressed with $charset[0] and the last with $charset[count($charset) - 1].

Answer：

Answer：

So, let me start off by saying USE A LIBRARY. Many exist:

The core of the problem is almost every answer in this page is susceptible to attack. mt_rand(), rand(), lcg_value() and uniqid() are all vulnerable to attack.

A good system will use /dev/urandom from the filesystem, or mcrypt_create_iv() (with MCRYPT_DEV_URANDOM) or openssl_pseudo_random_bytes(). Which all of the above do. PHP 7 will come with two new functionsrandom_bytes($len) and random_int($min, $max) that are also safe.

Be aware that most of those functions (except random_int()) return “raw strings” meaning they can contain any ASCII character from 0 - 255. If you want a printable string, I’d suggest running the result through base64_encode().

Answer：

Updated the code as per mzhang‘s great suggestion in the comments below.

Answer：

A better and updated version of @taskamiski’s excellent answer:

Php Generate Random Key Every 60 Minutes Free

Better version, using mt_rand() instead of rand():

Even better, for longer strings, using the hash() function that allows to select hashing algorithmns:

If you want to cut the result down to let’s say 50 chars, do it like this:

Answer：

Joining characters at the end should be more efficient that repeated string concatenation.

Edit #1: Added option to avoid character repetition.

Edit #2: Throws exception to avoid getting into infinite loop if $norepeat is selected and $len is greater than the charset to pick from.

Edit #3: Uses array keys to store picked random characters when $norepeat is selected, as associative array key lookup is faster than linearly searching the array.

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Answer：

I think I will add my contribution here as well.

Thanks

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Most aspects of this have already been discussed, but i’d recommend a slight update:
If you are using this for retail usage, I would avoid the domain
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789

and instead use:
ABCDEFGHJKMNPQRSTUVWXY3456789

Granted, you end up with far fewer characters, but it saves a great deal of hassle, as customers cannot mistake 0 for O, or 1 for l or 2 for Z. Also, you can do an UPPER on the input and customers can then enter upper or lower case letters — that is also sometimes confusing since they can look similar.

Answer：

What do you need a random string for?

Is this going to be used for anything remotely analogous to a password?

If your random string requires any security properties at all, you should use PHP 7’s random_int() function instead of all the insecure mt_rand() answers in this thread.

If you aren’t on PHP 7 yet (which is probably the case, as it hasn’t been released as of this writing), then you’ll want paragonie/random_compat, which is a userland implementation of random_bytes() and random_int() for PHP 5 projects.

For security contexts, always use random_int(), not rand(), mt_rand(), etc. See ircmaxell’s answer as well.

Answer：

This will work only in UNIX environment where PHP is compiled with mcrypt.

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Do you want to create your password by a random permutation of the original letters? Should it just contain unique characters?

Use rand to choose random letters by index.

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This is an old question but I want try to post my solution… I always use this my function to generate a custom random alphanumeric string…

test: UFOruSSTCPIqxTRIIMTRkqjOGidcVlhYaS9gtwttxglheVugFM

if you need two or more unique strings you can use this trick…

Steam

$string_1: tMYicqLCHEvENwYbMUUVGTfkROxKIekEB2YXx5FHyVByp3mlJO

$string_2: XdMNJYpMlFRKFDlF6GhVn6jsBVNQ1BCCevj8yK2niFOgpDI2MU

I hope this help.

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this code gets a random bytes, that are converted from binary to hexadecimal, and then takes a substring of this hexadecimal string, as long you puts in $length variable

Answer：

Try this

Simple enough!

Call the function as follows

where $length will be length of random string you want (this can be predefined also in the function as RandomFromCharset(charset,$length=10) ) to generate and $charset will be your existing string to which you want to restrict the characters.

Answer：

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you could make an array of characters then use rand() to pick a letter from the array and added it to a string.

*note that this does allow repeat characters

Answer：

This builds on Gumbo’s solution by adding functionality to list a set of characters to be skipped in the base character set. The random string selects characters from $base_charset which do not also appear in $skip_charset.

Here are some usage examples. The first two examples use the default value for $base_charset. The last example explicitly defines $base_charset.

Answer：

well, I was looking for a solution, and I kindda used @Chad Birch’s solution merged with @Gumbo’s one. This is what I came up with:

I think comments are pretty much unnecesary since the answers I used to build up this one are already thoroughly commented. Cheers!

Answer：

If you’re not concerned about time, memory, or cpu efficiency, and if your system can handle it, why not give this algorithm a try?!

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Maybe this will read better if it uses recursion, but I’m not sure if PHP uses tail recursion or not…

Tags: dom, phpphp, random, string