PHP function: Generate N non-repeated random numbers. php random number _ PHP Tutorial

Source: Internet
Author: User
PHP function: Generate N non-repeated random numbers and php random numbers. PHP function: Generate N random numbers without duplicates. php random number PHP function: Generate N random numbers without duplicates. train of thought: store the generated random number into an array, remove duplicate values in the array. PHP function: Generate N non-repeated random numbers and php random numbers.
PHP function: Generate N random numbers that are not repeated

Idea: store the generated random number into an array, and then remove duplicate values in the array to generate a certain number of non-repeated random numbers.

Program:

 

Note:

1. the mt_rand () function is used to generate random numbers. This function is four times faster than the rand () function;

2. when the array repeated values are removed, the "flip method" is used, that is, the array key and value are exchanged twice with array_flip. It is much faster than array_unique.


How does matlab generate random numbers that are not repeated?

Rand (1, 8) * 100
Ans =
Columns 1 through 7
81.4724 90.5792 12.6987 91.3376 63.2359 9.7540 27.8498
Column 8
54.6882

How to use the if function to generate N random numbers in excel

Select A1: A1000, and enter
= RAND ()
Press CTRL + press Enter]
Select B1: B1000, and enter
= RANK (A1, a $1: A $1000)
Press CTRL + press Enter]

Random number PHP function: Generate N non-repeated random numbers. train of thought: store the generated random number into an array, and then remove repeated values in the array...

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