PHP: A method for generating non-repeating random numbers

Source: http://www.ido321.com/1217.html

Whether it's a Web application, a WAP, or a mobile app, random numbers have their way. In several recent small projects, I also often need to deal with random numbers or random arrays, so, for PHP how to produce non-repeating random number of common methods to summarize (PS: Methods 1, 4, 5 is what I used, the rest from the network finishing)

Method One:

$num = 6; $result = Array_slice ($numbers, 0, $num); Print_r ($result);?>

Method Two:

//Sow random number generator seed, dispensable, no effect on the result after testing Srand (float//Skip list First value (save index) while (list  echo"$number";}? >

Method Three:

function Norand ($begin =0, $end =20, $limit =5) {$rand _array=range ($begin, $end); Shuffle ($rand _array);  return array_slice ($rand _array,0, $limit);  } print_r (Norand ());?>

The above can randomly produce 5 distinct values in 1-20.

Method Four:

<?php $tmp =arraywhile (count ($tmp) <5) {$tmp []=mt_rand (1,20); $tmp =array_unique ($tmp);} Print_r ($tmp);? >

Method Five:

<?php $tmp = Range (1,30);p Rint_r (Array_rand ($tmp, 10));? >

This may be simpler than the call. (PS: If you specify a step in range, you must be aware that the second parameter of Array_rand exceeds the length of $tmp).

PHP provides a very rich array of functions, the generation of random numbers can be from the angle of the array, if you have a way to provide, welcome, the article will continue to update.

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PHP: A method for generating non-repeating random numbers