Detailed explanation of the steps to use the php array function shuffle() and array_rand() random functions

During the development or learning process of using Golang, we may encounter the error message of undefined:rand.Seed. This error usually occurs when you need to use a random number generator, because in Golang you need to set a random number seed before you can use the function in the rand package. This article will explain how to resolve this error. 1. Introduce the math/rand package. First, we need to introduce the math/rand package into the code. exist

Java uses the shuffle() function of the Collections class to disrupt the order of elements in the collection. In the Java programming language, the Collections class is a tool class that provides various static methods for operating collections. One of them is the shuffle() function, which can be used to shuffle the order of elements in a collection. This article demonstrates how to use this function and provides corresponding code examples. First, we need to import the Collections class in the java.util package,

Title: Example of using the Array.Sort function to sort an array in C# Text: In C#, array is a commonly used data structure, and it is often necessary to sort the array. C# provides the Array class, which has the Sort method to conveniently sort arrays. This article will demonstrate how to use the Array.Sort function in C# to sort an array and provide specific code examples. First, we need to understand the basic usage of the Array.Sort function. Array.So

In PHP, there are many powerful array functions that can make array operations more convenient and faster. When we need to combine two arrays into an associative array, we can use PHP's array_combine function to achieve this operation. This function is actually used to combine the keys of one array as the values ​​of another array into a new associative array. Next, we will explain how to use the array_combine function in PHP to combine two arrays into an associative array. Learn about array_comb

When programming in PHP, we often need to merge arrays. PHP provides the array_merge() function to complete array merging, but when the same key exists in the array, this function will overwrite the original value. In order to solve this problem, PHP also provides an array_merge_recursive() function in the language, which can merge arrays and retain the values ​​of the same keys, making the program design more flexible. array_merge

The rand() function uses the same initial seeds on each call. The default initial seed is obtained from the operating system's time, but it only has microsecond accuracy. That is, within a very short period of time, many rand() function calls will use the same initial seed, resulting in the same random number generation. So, how to solve this problem?

Synchronizing random number generation in Go concurrent programming: Use a mutex (sync.Mutex) to control access to the rand.Rand random number generator. Each goroutine acquires the mutex lock before generating random numbers and releases the mutex lock after generating it. This ensures that only one goroutine can access the random number generator at a time, eliminating data races.

There are the following functions in PHP that can shuffle an array randomly: shuffle() directly changes the order of array elements. array_rand() returns a random key, which can rearrange the array order based on the key.