PHP Array functions

PHP have some inbuilt functions for managing arrays, functions are

array_change _key_case
Returns an array with all string keys to lowercase or uppercase letter(s).
array_chunk
Split an array into chunks
array_combine
Creates an array by using one array for keys and another for its values
array_count _values
Counts all the values of an array
array_diff_assoc
Computes the difference of arrays with additional index check
array_diff_key
Computes the difference of arrays using keys for comparison
array_diff_uassoc
Computes the difference of arrays with additional index check which is performed by a user supplied callback function
array_diff_ukey
Computes the difference of arrays using a callback function on the keys for comparison
array_diff
Computes the difference of arrays
array_fill_keys
Fill an array with values, specifying keys
array_fill
Fill an array with values
array_filter
Filters elements of an array using a callback function
array_flip
Exchanges all keys with their associated values in an array
array_intersect _assoc
Computes the intersection of arrays with additional index check
array_intersect _key
Computes the intersection of arrays using keys for comparison
array_intersect _uassoc
Computes the intersection of arrays with additional index check, compares indexes by a callback function
array_intersect _ukey
Computes the intersection of arrays using a callback function on the keys for comparison
array_intersect
Computes the intersection of arrays
array_key_exists
Checks if the given key or index exists in the array
array_keys
Return all the keys or a subset of the keys of an array
array_map
Applies the callback to the elements of the given arrays
array_merge _recursive
Merge two or more arrays recursively
array_merge
Merge one or more arrays
array_multisort
Sort multiple or multi-dimensional arrays
array_pad
Pad array to the specified length with a value
array_pop
Pop the element off the end of array
array_product
Calculate the product of values in an array
array_push
Push one or more elements onto the end of array
array_rand
Pick one or more random entries out of an array
array_reduce
Iteratively reduce the array to a single value using a callback function
array_replace _recursive
Replaces elements from passed arrays into the first array recursively
array_replace
Replaces elements from passed arrays into the first array
array_reverse
Return an array with elements in reverse order
array_search
Searches the array for a given value and returns the corresponding key if successful
array_shift
Shift an element off the beginning of array
array_slice
Extract a slice of the array
array_splice
Remove a portion of the array and replace it with something else
array_sum
Calculate the sum of values in an array
array_udiff_assoc
Computes the difference of arrays with additional index check, compares data by a callback function
array_udiff _uassoc
Computes the difference of arrays with additional index check, compares data and indexes by a callback function
array_udiff
Computes the difference of arrays by using a callback function for data comparison
array_uintersect _assoc
Computes the intersection of arrays with additional index check, compares data by a callback function
array_uintersect _uassoc
Computes the intersection of arrays with additional index check, compares data and indexes by a callback functions
array_uintersect
Computes the intersection of arrays, compares data by a callback function
array_unique
Removes duplicate values from an array
array_unshift
Prepend one or more elements to the beginning of an array
array_values
Return all the values of an array
array_walk _recursive
Apply a user function recursively to every member of an array
array_walk
Apply a user function to every member of an array
array
Create an array
arsort
Sort an array in reverse order and maintain index association
asort
Sort an array and maintain index association
compact
Create array containing variables and their values
count
Count all elements in an array, or something in an object
current
Return the current element in an array
each
Return the current key and value pair from an array and advance the array cursor
end
Set the internal pointer of an array to its last element
extract
Import variables into the current symbol table from an array
in_array
Checks if a value exists in an array
key
Fetch a key from an array
krsort
Sort an array by key in reverse order
ksort
Sort an array by key
list
Assign variables as if they were an array
natcasesort
Sort an array using a case insensitive “natural order” algorithm
natsort
Sort an array using a “natural order” algorithm
next
Advance the internal array pointer of an array
pos
Alias of current
prev
Rewind the internal array pointer
range
Create an array containing a range of elements
reset
Set the internal pointer of an array to its first element
rsort
Sort an array in reverse order
shuffle
Shuffle an array
sizeof
Alias of count
sort
Sort an array
uasort
Sort an array with a user-defined comparison function and maintain index association
uksort
Sort an array by keys using a user-defined comparison function
usort
Sort an array by values using a user-defined comparison function

Sort an array using sort() in PHP.
<?php
$employeeNames = array(0=>’name4′,1=>’name2′,2=>’name3′,3=>’name1′);
sort($employeeNames);
print_r($employeeNames);
?>

Output : Array ( [0] => name1 [1] => name2 [2] => name3 [3] => name4 )

Print numbers 4,6,8,10,12 using range() in PHP
<?php
$numbers = range(4,12,2);
print_r($numbers);
?>

Output : Array ( [0] => 4 [1] => 6 [2] => 8 [3] => 10 [4] => 12 )