PHP Ds\Map Functions Complete Reference
Last Updated :
25 Jan, 2023
A Map is a sequential collection of key-value pair which is very similar to the array. The key of a map can be of any type and it is unique. If any value added to the same key in a Map then the map value will replace. It is the efficient Data Structure in PHP 7 to provide the alternative of an array.
Requirements: PHP 7 is required for both extension and the compatibility polyfill.
Installation: The easiest way to install data structure by using PECL extension.
pecl install ds
Syntax:
public Ds\Map::functionName()
Example: Below programs illustrate the Ds\Map::filter() function in PHP:
PHP
<?php
$map = new \Ds\Map([
1 => "Welcome" ,
2 => "to" ,
3 => "Geeks" ,
4 => "for" ,
5 => "Geeks" ]);
var_dump( $map ->filter( function ( $key , $val ) {
return $key % 3 == 0;
}));
?>
|
Output:
object(Ds\Map)#3 (1) {
[0]=>
object(Ds\Pair)#2 (2) {
["key"]=>
int(3)
["value"]=>
string(5) "Geeks"
}
}
Complete list of data structure DS\Map:
PHP Ds\Map Functions
|
Description
|
allocate() |
Allocate enough memory for required capacity. |
apply() |
Apply a specific operation to all of the elements present in the map |
capacity() |
Return the current capacity of the map. |
clear() |
It is used to clear a Map object. |
__construct() |
It is used to creates a new instance. |
copy() |
Get a shallow copy of the specified Map instance. |
count() |
Count the number of elements present in the Map. |
diff() |
Create a map using the key which contains the elements of the first map which are not present in another map. |
filter() |
Create a new map using the filter function. |
first() |
Get the first key-value pair from the Map instance. |
get() |
Return the value of the given key. |
hasKey() |
Check whether a given Key is present in the Map object or not. |
hasValue() |
Determines whether the map contains a given value |
intersect() |
Create a new map that contains the intersection with another map. |
isEmpty() |
Check whether a given Map is empty or not. |
keys() |
Set of keys of the current Map instance. |
ksort() |
Sort the map element in-place by key. |
ksorted() |
Returns a copy which is sorted by key. |
last() |
Find and get the last key-value pair from a Map object. |
map() |
Apply a callback function to a Map object. |
merge() |
Return the result of adding all given associations. |
pairs() |
Get all of the pairs from the specified Map instance. |
put() |
It is used to associates a key with a value. |
putAll() |
Associate all key-value pairs of a traversable object or array. |
reduce() |
Reduce the map to a single value by applying operations using the callback function. |
reverse() |
In-place reverse the elements of a specified Map instance. |
reversed() |
Get a copy of the reverse of elements of a specified Map instance. |
skip() |
Return the pair at a given positional index. |
slice() |
Get a subset of the specified Map instance. |
sort() |
In-place sort the elements of a specified Map instance according to the values. |
sorted() |
Get a copy of the specified Map instance sorted according to the values. |
sum() |
Get the sum of all of the values present in the Map instance. |
toArray() |
Get an array generated by converting the Map instance into an Array. |
union() |
Create a new map that contains the union of two maps. |
values() |
Return a sequence of the map’s values. |
xor() |
Create a new map that contains the value either in the first map or the second map but not both. |
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