What array functions are there in php

The array functions in php include: 1. array() function, which creates an empty array; 2. range() function, which creates an array containing numbers within a specific range; 3. explode() function, which The string is converted into an array according to the specified delimiter; 4. The list() function assigns the array to a set of variables; 5. the foreach() function is used to traverse the array and extract the values ​​​​in the array; 6. print_r( ) function, prints an array in an easy-to-read manner; 7. var_dump() function, etc.

The operating system for this tutorial: Windows 10 system, PHP8.1.3 version, Dell G3 computer.

In PHP, arrays are one of the most commonly used data structures. In order to facilitate the processing of arrays, PHP provides many array functions. This article will introduce some commonly used PHP array functions.

Creation and initialization of array

(1) array() function: Create an empty array.

(2) range() function: Create an array containing numbers within a specific range.

(3) explode() function: Convert a string into an array according to the specified delimiter.

(4) list() function: assign an array to a set of variables.

Array traversal and output

(1) foreach() function: used to traverse the array and extract the values ​​​​in the array.

(2) print_r() function: Print an array in an easy-to-read manner.

(3) var_dump() function: Print an array in a more detailed way, including key name, key value, data type and other information.

Adding, deleting and modifying arrays

(1) array_push() and array_pop() functions: used to add/delete elements at the end of the array.

(2) array_unshift() and array_shift() functions: used to add/remove elements from the head of the array.

(3) unset() function: used to delete specified array elements.

(4) array_splice() function: used to delete elements in the array and insert new elements.

(5)array_merge() function: Merge two arrays into one array.

(6)array_replace() function: Replace an array with another array.

Array query

(1) in_array() function: used to check whether a certain value exists in the array.

(2) array_search() function: Find a value in the array and return the first matching key.

(3) array_key_exists() function: Check whether the specified key name exists in the array.

(4) array_values() function: Returns a new array of all values ​​in the array, re-indexed and sorted.

Array statistics

(1) count() function: used to count the number of elements in the array.

(2) array_sum() function: Calculate the sum of all values ​​in the array and return the result.

(3) array_product() function: Calculate the product of all values ​​in the array and return the result.

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