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I have 62 base64 characters that I want to randomize. How can I do this using PHP? The string would be all letters, upper and lower case as well as numbers from 0-9.
The thing that is most important to me is that the entire string be evaluated before a return value is given. In other words, if I request a string of 8 characters in length and my string starts out like:
1234567890ABCDE..... I don't want to get the first 8 numbers randomized. It should randomize the entire string first, then return 8 characters from that.
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asked Feb 22 '10 10:02
A random string is generated by first generating a stream of random numbers of ASCII values for 0-9, a-z and A-Z characters. All the generated integer values are then converted into their corresponding characters which are then appended to a StringBuffer.
If you need a string of random digits up to 32 characters for test data or just need some junk text to fill a field, SQL Server's NEWID() function makes this simple. NEWID() is used to create a new GUID (globally unique identifier), and we can use that as a base to get a string of random characters.
Method 1: Using Math. random() Here the function getAlphaNumericString(n) generates a random number of length a string. This number is an index of a Character and this Character is appended in temporary local variable sb. In the end sb is returned.
Try this:
$string = '1234567890ABCDE...';
$string = substr(str_shuffle($string), 0, 8);
str_shuffle randomizes the string, then substr takes the first 8 characters from it.
66
Take a look at str_shuffle.
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