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Php Generate Random Key String
I was working on a project recently that required unique API keys to be generated for clients connecting to the server. For various reasons, I settled on the style of license key you commonly see for software packages. You know, the kind you always had to read off the back of a CD case and type in when installing the application. Like H8OV7-HNTB5-JLLOH-W8FG2
.
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It’s fairly easy to write such a function. The basic idea is to loop around four times—once for each segment—and have a nested loop that runs five times, picking a random character each time. Here’s what I came up with:
PHP Random numbers Random numbers are really widely used when programming a website. They are useful for generating random passwords, temporary verification codes or activation links. In addition, you may want to display various quotes or random products on your home page, feature random author or seller, etc. Feb 13, 2013 The inner loop picks a character out of $tokens at random each time it goes around. (PHP strings are also arrays, with the each character having its own numerical offset.) The characters are tacked onto the $segment string.
The $tokens
string contains the characters that are valid in the key, so the loop can pick from it. The $segment_chars
and $num_segments
variables are the number of characters in a segment and the number of segments in the key, respectively. $key_string
is an empty string that the loop will add the characters into.
Need to know how to generate a random password string in MySQL? Here is a simple way! Generate random string in MySQL Home Blog Generate random string in MySQL. Submitted by Nicholas Thompson on Thu, 10th Jul 2008 - 08:51. Tagged in: security, programming, mysql, howto and geek. Have you ever wanted to generate a. Jan 03, 2015 Hi, how can i generate unique alphanumeric like this example EA070998 EA011575 HK144331 A0058579 Thank you in advance.
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The first for loop runs four times, assuming the desired result is four segments in the key. The inner loop picks a character out of $tokens
at random each time it goes around. (PHP strings are also arrays, with the each character having its own numerical offset.) The characters are tacked onto the $segment
string.
Then the segment is joined with the $key_string
, and a dash character is applied if the loop isn’t on the final segment yet. End result: something like H8OV7-HNTB5-JLLOH-W8FG2
.
Now how can you make sure the key is unique when it’s generated?
Php Generate Random Key String Notes
You generate a new key string with the function, check to see if it exists in your database, and lather/rinse/repeat until that is no longer the case. Usually you won’t have collisions too often, so it will only need to run once. I’m too lazy to figure out the probability, but considering there are 52,521,875 possible combinations for one 5-character segment…you’re probably not going to run into performance issues anytime soon. And if you do, just add another segment onto your key strings.