php random number between 1 and 20

In-depth understanding of the security of mt_rand () random numbers in PHP, and in-depth understanding of mt_rand Preface Many security vulnerabilities related to mt_rand () have been dug up some time ago, which are basically caused by incorrect

PHP is also capable of major random functions, PHP event random functions Write in front PHP can also do big things is my summary of PHP syntax features and related functions of the classic use of library, and is not really able to achieve the

Php generates multiple random number instances. You can directly use mt_rand to generate random data in php. if you want to generate random numbers without duplicates, you can use the unique_rand function. below I will summarize the commonly used

Mt_rand () Use the Mersennetwister algorithm to return random integers, this everyone knows, but the following this article mainly introduces to you about PHP Mt_rand () random number of security related data, the article introduced in very detailed,

Many of the security breaches associated with Mt_rand () have been dug up in the previous period, largely as a result of the erroneous understanding of random number usage. Here again to mention the PHP website manual A pit, see About Mt_rand ()

Php generates multiple random number instances The Code is as follows: // Range is an array of columns from 1 to 100.$ Numbers = range (1, 1,100 );// Shuffle will immediately disrupt the array orderShuffle ($ numbers );// Array_slice retrieves a

Random is used to generate random numbers. we can use it to randomly generate numbers or select strings. & Amp; #8226; random. seed (x) changes the seed of the random number generator. Generally, you do not need to set seed. Python automatically

Generate random data in PHP directly using Mt_rand can be achieved, if you want to generate non-repeating random number we can use the Unique_rand function, let me summarize the commonly used methods. The code is as follows: The code is

Random number between 0-1# awk ' Begin{srand ();p rintf "%.16f\n", Rand ()} 'Random number between 0-20# awk ' Begin{srand (); Sum=rand () *21;printf ("%d\n", Sum)} '# echo ' Expr $RANDOM% 21 '# echo ' Expr $ (expr $ (date +%n)% 20) + 1 '# echo '

The code is as follows: The code is as follows:Copy code // Range is an array of columns from 1 to 100.$ Numbers = range (1, 1,100 );// Shuffle will immediately disrupt the array orderShuffle ($ numbers );// Array_slice retrieves a segment of