What are the commonly used array functions in PHP?

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.

1. 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.

2. 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.

3. Adding, deleting and modifying arrays

(1) array_push() and array_pop() functions: used to add/remove 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 the specified array element.

(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.

4. Sorting of arrays

(1) sort() function: used to sort the array in ascending order.

(2) rsort() function: used to sort the array in descending order.

(3) ksort() function: Sort in ascending order by key name.

(4) krsort() function: Sort in descending order by key name.

(5) asort() function: Sort in ascending order by key value.

(6) arsort() function: Sort in descending order by key value.

5. 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.

6. 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.

7. Operations of multi-dimensional arrays

(1) array_column() function: Extract the specified column from the multi-dimensional array and return a new one-dimensional array.

(2)array_walk_recursive() function: Recursively traverses each element of the array and can be used to operate on multi-dimensional arrays.

(3) array_merge_recursive() function: used to merge multiple arrays. If they have the same key name, they will be merged recursively.

Summary

PHP array functions have many functions that allow us to process arrays more conveniently and achieve the desired purposes. Whether it is creating, initializing, traversing, adding, deleting, modifying, sorting, querying or counting arrays, there are corresponding array functions that can be used. When performing array operations, understanding the application scenarios of these functions can enable us to process arrays more efficiently.

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