Sort out another php method to generate random numbers without repetition-PHP source code

There are many built-in Random Functions in php. These functions can generate random but may be repeated multiple times. The following lists some functions that generate random numbers without repeated numbers. There are many built-in Random Functions in php. These functions can generate random but may be repeated multiple times. The following lists some functions that generate random numbers without repeated numbers.

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Random numbers are useful for Web applications, WAP or mobile applications. In recent small projects, I often need to deal with random numbers or random arrays. Therefore, I would like to summarize several common methods for generating non-repeated random numbers in PHP (ps: methods 1, 4, and 5 are commonly used, and the rest are from network arrangement)

Method 1:

The Code is as follows:
$ Numbers = range (1, 50 ); // Shuffle will immediately disrupt the array order Shuffle ($ numbers ); // Array_slice retrieves a segment of the array $ Num = 6; $ Result = array_slice ($ numbers, 0, $ num ); Print_r ($ result ); ?>

Method 2:

The Code is as follows:
$ Numbers = range (1, 20 ); // Broadcast the seed of the random number generator, which is dispensable and does not affect the test result. Srand (float) microtime () * 1000000 ); Shuffle ($ numbers ); // Skip the first value of the list (the index is saved) While (list (, $ number) = each ($ numbers )){ Echo "$ number "; } ?>

Method 3:

The Code is as follows:
Function NoRand ($ begin = 0, $ end = 20, $ limit = 5 ){ $ Rand_array = range ($ begin, $ end ); Shuffle ($ rand_array); // call the random array arrangement function. Return array_slice ($ rand_array, 0, $ limit); // the first $ limit } Print_r (NoRand ()); ?>

Five distinct values can be randomly generated between 1 and 20.

Method 4:

The Code is as follows:
$ Tmp = array (); While (count ($ tmp) <5 ){ $ Tmp [] = mt_rand (1, 20 ); $ Tmp = array_unique ($ tmp ); } Print_r ($ tmp ); ?>

Method 5:

The Code is as follows:
$ Tmp = range (1, 30 ); Print_r (array_rand ($ tmp, 10 )); ?>

This may be simpler (ps: If the step is specified in the range, you must note whether the second parameter of array_rand exceeds the length of $ tmp ).

PHP provides a rich array function, and generates random numbers most of the time from the array perspective. If you have other methods available, please refer to the article for continuous updates.