A complete list of arrays and array functions for PHP variables and type extensions

1. Overview and installation

These functions allow you to use and manipulate arrays in different ways. Arrays are an essential tool for storing, managing, and manipulating variables.

PHP supports simple arrays and multi-dimensional arrays. Arrays can be created by users themselves or by other functions. There are many special database handling functions that can return arrays from database queries as well as some functions that return arrays.

Please refer to the chapter about arrays to learn more about how arrays are implemented and used in PHP.

No installation is required to use these functions, they are part of the PHP core.

2. A complete list of array functions

array_change_key_case — Returns an array whose string keys are all lowercase or uppercase Array, use the value of one array as its key name, and the value of another array as its value

array_count_values ​​— Count the number of occurrences of all values ​​in the array

array_diff_assoc — Calculate the difference set of the array with index check

array_diff_key — Use Compare key names to calculate the difference set of arrays

array_diff_uassoc — Use the callback function provided by the user to do index checking to calculate the difference set of the array

array_diff_ukey — Use the callback function to compare the key names to calculate the difference set of the array

array_diff — Calculate the difference set of the array Difference

array_fill_keys — Fill an array with specified keys and values ​​

array_fill — Fill an array with a given value

array_filter — Use a callback function to filter cells in an array

array_flip — Swap keys and values ​​in an array

array_intersect_assoc — Calculate the intersection of arrays with index checking

array_intersect_key — Calculate the intersection of arrays using key name comparison

array_intersect_uassoc — Calculate the intersection of arrays with index checking, use callback function to compare indexes

array_intersect_ukey — Use callback function to compare key names to calculate Intersection of arrays

array_intersect — Calculate the intersection of arrays

array_key_exists — Check whether the given key or index exists in the array

array_keys — Return all keys in the array

array_map — Apply the callback function to the given On the cell of the array

array_merge_recursive — Recursively merge one or more arrays

array_merge — Merge one or more arrays

array_multisort — Sort multiple arrays or multidimensional arrays

array_pad — Fill the array with values ​​to the specified Length

array_pop — Pop the last element of the array (pop)

array_product — Calculate the product of all values ​​in the array

array_push — Push one or more elements to the end of the array (push)

array_rand — From Randomly take one or more elements from the array

array_reduce — use the callback function to iteratively reduce the array to a single value

array_replace_recursive — use the passed array to recursively replace the elements of the first array

array_replace — use the passed array to replace The element of the first array

array_reverse — Returns an array with the cells in reverse order

array_search — Searches for a given value in the array, and returns the corresponding key name if successful

array_shift — Moves the cells at the beginning of the array out of the array

array_slice — Take out a segment from the array

array_splice — Remove a part of the array and replace it with other values ​​

array_sum — Calculate the sum of all values ​​in the array

array_udiff_assoc — Calculate the difference of the array with index checking and compare with the callback function Data

array_udiff_uassoc — Calculate the difference of arrays with index check, use callback function to compare data and index

array_udiff — Use callback function to compare data to calculate the difference of array

array_uintersect_assoc — Calculate intersection of arrays with index check, use callback Function to compare data

array_uintersect_uassoc — Calculate the intersection of arrays with index check, use callback function to compare data and index

array_uintersect — Calculate intersection of arrays, use callback function to compare data

array_unique — Remove duplicate values ​​in array

array_unshift — Insert one or more cells at the beginning of the array

array_values ​​— Return all values ​​in the array

array_walk_recursive — Recursively apply a user function to each member of the array

array_walk — Apply a user function to each member of the array

array — Create a new array

arsort — Sort the array in reverse order and maintain the index relationship

asort — Sort the array and maintain the index relationship

compact — Create an array, including variable names and their values ​​

count — Count the number of cells or objects in the array The number of attributes in

current — Returns the current unit in the array

each — Returns the current key/value pair in the array and moves the array pointer forward one step

end — Points the internal pointer of the array to the last unit

extract — Import variables from the array into the current symbol table

in_array — Check whether a value exists in the array

key_exists — Alias ​​array_key_exists

key — Get the key name from the associative array

krsort — Sort the array as Reverse sorting of key names

ksort — Sort the array by key name

list — Assign the values ​​in the array to some variables

natcasesort — Use the "natural sorting" algorithm to sort the array in a case-insensitive manner

natsort — Sort the array using the “natural ordering” algorithm

next — Move the internal pointer in the array forward one bit

pos — Alias ​​for current

prev — Move the internal pointer of the array back one position

range — Create An array containing a specified range of cells

reset — Point the internal pointer of the array to the first cell

rsort — Reverse sort the array

shuffle — Shuffle the array

sizeof — Alias ​​of count

sort — Sort the array Sort

uasort — Use user-defined comparison function to sort the values ​​in the array and maintain index association

uksort — Use user-defined comparison function to sort the keys in the array

usort — Use user-defined The comparison function sorts the values ​​in an array