Advanced configuration for nginx There are some small changes you can make to make your website faster, and a little more secure. Security enhancements The original configuration will keep you safe. Apr 20, 2011 Beginner PHP Tutorial - 60 - Random Number Generation thenewboston. How to Create a Unique String in PHP Generate a Key PHP Tutorial. Generate Random Numbers without Repeats - Duration. Apr 21, 2011 Beginner PHP Tutorial - 60 - Random Number Generation thenewboston. How to Create a Unique String in PHP Generate a Key PHP Tutorial. Generate Random Numbers without Repeats - Duration.
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Because time values are nothing more than a decimal extension of the date serial numbering system, you can add two time values together to get a cumulative time value. In some cases, you may want to add a set number of hours and minutes to an existing time value. In these situations, you can use the TIME function.
Cell D4 in Figure 4-20 contains this formula:
In this example, you add 5 hours and 30 minutes to all the times in the list.
The TIME function allows you to build a time value on the fly using three arguments: hour, minute, and second.
For example, the following formula returns the time value 2:30:30 p.m.:
To add a certain number of hours to an existing time value, simply use the TIME function to build a new time value and then add them together. The following formula adds 30 minutes to the existing time, resulting in a time value of 3:00 p.m.
I know that the rand function in PHP generates random integers, but what is the best way to generate a random string such as:
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.
Instead of loading up a big menu, you actually enter a separate area of the game. To help out we’ve put together this quick guide, showing you how to play online in Monster Hunter Generations.So, Monster Hunter Generations doesn’t handle online play like most other games. Monster hunter generations ultimate key quests.
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.
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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].
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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().
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Updated the code as per mzhang‘s great suggestion in the comments below.
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A better and updated version of @taskamiski’s excellent answer:
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:
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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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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.
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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.
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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…
$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
All of the examples provided are installation keys only; they will not activate your installed version of Windows. They are the default keys that are inserted if you choose to skip entering a Product Key during the installation process. Windows server 2008 standard product key crack.
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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.
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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
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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.
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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!
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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?!
Maybe this will read better if it uses recursion, but I’m not sure if PHP uses tail recursion or not…
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