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PHP array functions

Here, we will see the functions that can be used with an array. We’ll divide the different functions into sections to make it more understandable and readable.

In this list of functions, there are two that are actually constructors, one is array, and the other is list

Something to keep in mind is that array is not an object, and list isn’t either. these 2 are estructures of the language

I will take a break for a few days, and then I will continue with this section of the blog. Thank you for understanding

Constructors

constructor	description	return
array	creates an array	array
list	create a list with array data	array

Create an array

function/constructor	description	return
range		array
array	creates an array	array

Array Modification

function	description	return
array_pad	Pad array to the specified length with a value	array
array_pop	Pop the element off the end of array	mixed
array_push	Push one or more elements onto the end of array	int
array_search	Searches the array for a given value and returns the first corresponding key if successful	int \| string \| false
array_shift	Shift an element off the beginning of array	mixd
array_unshift	Prepend one or more elements to the beginning of an array	int
array_change_key_case	Changes the case of all keys in an array	array

Getting data from an Array

function	description	return
in_array	Checks if a value exists in an array	bool
key_exists / array_key_exists	Checks if the given key or index exists in the array	bool
array_is_list	Checks whether a given array is a list	bool
key	Fetch a key from an array	int \| string \| null
array_rand	Pick one or more random keys out of an array	int \| string \| array
array_keys	Return all the keys or a subset of the keys of an array	array
array_column	Return the values from a single column in the input array	array
array_count_values	Counts the occurrences of each distinct value in an array	array
count / sizeof	Counts all elements in an array or in a Countable object	int
array_unique	Removes duplicate values from an array	array
array_values	Return all the values of an array	array
array_key_first	Gets the first key of an array	int \| string \| null
array_key_last	Gets the last key of an array	int \| string \| null

Array intersection

When we talk about intersection, we are referring to the intersection between arrays. Let’s imagine the arrays as sets, so picture the sets as circles. A1 is the red circle, A2 is the green circle, and A3 is the blue circle

For intersections between arrays, PHP provides us with the following functions:

function	description	return
array_intersect_assoc	Computes the intersection of arrays with additional index check	array
array_intersect_key	Computes the intersection of arrays using keys for comparison	array
array_intersect_uassoc	Computes the intersection of arrays with additional index check, compares indexes by a callback function	array
array_intersect_ukey	Computes the intersection of arrays using a callback function on the keys for comparison	array
array_intersect	Computes the intersection of arrays	array
array_uintersect_assoc	Computes the intersection of arrays with additional index check, compares data by a callback function	array
array_uintersect_uassoc	Computes the intersection of arrays with additional index check, compares data and indexes by separate	array
array_uintersect	Computes the intersection of arrays, compares data by a callback function	array

Functions for obtaining the difference

These functions will give us the difference with respect to another array or other arrays, based on their values or keys. If we view the arrays as sets, it would be something like this: A1 is the red circle, A2 is the green circle, and A3 is the blue circle.

These are the functions that PHP has for calculating the difference:

function	description	return
array_diff_assoc	Computes the difference of arrays with additional index check	array
array_diff_key	Computes the difference of arrays using keys for comparison	array
array_diff_uassoc	Computes the difference of arrays with additional index check which is performed by a user supplied callback function	array
array_diff_ukey	Computes the difference of arrays using a callback function on the keys for comparison	array
array_diff	Computes the difference of arrays	array
array_udiff_assoc	Computes the difference of arrays with additional index check, compares data by a callback function	array
array_udiff_uassoc	Computes the difference of arrays with additional index check, compares data and indexes by a callback function	array
array_udiff	Computes the difference of arrays by using a callback function for data comparison	array

Functions for sorting an array

function	description	return
sort	Sort an array in ascending order	true
uasort	Sort an array with a user-defined comparison function and maintain index association	true
uksort	Sort an array by keys using a user-defined comparison function	true
usort	Sort an array by values using a user-defined comparison function	true
natcasesort	Sort an array using a case insensitive “natural order” algorithm	true
natsort	Sort an array using a “natural order” algorithm	true
krsort	Sort an array by key in descending order	true
ksort	Sort an array by key in ascending order	true
array_multisort	Sort multiple or multi-dimensional arrays	bool
arsort	Sort an array in descending order and maintain index association	true
asort	Sort an array in ascending order and maintain index association	true
rsort	Sort an array in descending order	true
array_reverse	Return an array with elements in reverse order	array
array_flip	Exchanges all keys with their associated values in an array	array
shuffle	Shuffle an array	true

Functions for partitioning or slicing an array

function	description	return
array_chunk	Split an array into chunks	array
array_slice	Extract a slice of the array	array
array_splice	Remove a portion of the array and replace it with something else	array

Arrays iteration

function	description	return
array_filter	Filters elements of an array using a callback function	array
array_walk_recursive	Apply a user function recursively to every member of an array	array
array_walk	Apply a user supplied function to every member of an array	array
array_map	Applies the callback to the elements of the given arrays	array

Merge Arrays

When we perform a merge, more than simply joining, what we do is a fusion between them, so if they have equal values and keys, the new array will not repeat them. So will not be duplicated elements in the new array.

function	description	return
array_merge_recursive	Merge one or more arrays recursively	array
array_merge	Merge one or more arrays	array

Combine Arrays

The combination is quite simple to understand. If we have 2 arrays, it will take the values from the first array and use them as keys in the new array. The values from the second array will become the values of the new array.

function	description	return
array_combine	Crea un nuevo array, usando una matriz para las claves y otra para sus valores	aray

Position Management

function	description	return
current / pos	Return the current element in an array	mixed
end	Set the internal pointer of an array to its last element	mixed
next	Advance the internal pointer of an array	mixed
prev	Rewind the internal array pointer	mixed
reset	Set the internal pointer of an array to its first element	mixed

Reemplace elements

function	description	return
array_replace_recursive	Replaces elements from passed arrays into the first array recursively	array
array_replace	Replaces elements from passed arrays into the first array	array

Maths operations

function	description	return
array_reduce	Iteratively reduce the array to a single value using a callback function	mixed
array_sum	Calculate the sum of values in an array	int\|float
array_product	Calculate the product of values in an array	int\|float

Compact and extract

function	description	return
compact	Create array containing variables and their values	array
extract	Import variables into the current symbol table from an array	int

Category: en-php

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