How to generate non-repeating random numbers in php

How to generate non-repeating random numbers in php: 1. Use the function shuffle to randomly disrupt the order of the array, and take a certain section of the array, the code is [shuffle ($numbers)]; 2. Call The ready-made array randomly arranges the functions and intercepts the first [$limit] ones.

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php does not generate Method of repeating random numbers:

Method one:

The code is as follows:

Method two:

The code is as follows:

Method 3:

The code is as follows:

The above can randomly generate 5 non-repeating values ​​between 1-20

Method 4:

The code is as follows:

Method 5:

The code is as follows:

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

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