Home » Learn » PHP Tutorial » PHP Array Functions

PHP Array Functions

PHP Array Functions allow you to access and manipulate arrays. Simple and multi-dimensional arrays are supported.

Some Important Functions of PHP Arrays are listed below:

array()

Returns an array of the parameters. The parameters can be given an index with the => operator

Syntax

array(key1 => value1, key2 => value2...)

Parameters
  • key-Optional. Specifies the key, of type numeric or string. If not set, an integer key is generated, starting at 0
  • value-Required. Specifies the value
<?php
   $b = array("a"=>"horse", "b"=>"aunt", "c"=>"dog");
   print_r($b);
?>

Run : http://ideone.com/7bpwAw

Tutorials Class - Output Window

Array
(
[a] => horse
[b] => aunt
[c] => dog
)

sizeof ()

This function is used to count the items of the array. (count() is also used instead of this).

<?php
$cars=array("Volvo","BMW","Toyota");
echo sizeof($cars);
?>

Run : http://ideone.com/2wkVF6

Tutorials Class - Output Window

3

array_merge()

Merges the elements of one or more arrays together so that the values of one are appended to the end of the previous one.

Syntax

array array_merge ( array $array1 [, array $array2 [, array $array3...]] );

Parameters
  • array1-Required. Specifies an array.
  • array2-Optional. Specifies an array.
  • array3-Optional. Specifies an array.
<?php
   $array1 = array("a"=>"Red","b"=>"Blue","c"=>"Pink");
   $array2 = array("d"=>"Green","a"=>"Brown","e"=>"Saphoron");
   
   print_r(array_merge($array1,$array2));
?>

Run : http://ideone.com/Q1tfcO

Tutorials Class - Output Window

Array
(
[a] => Brown
[b] => Blue
[c] => Pink
[d] => Green
[e] => Saphoron
)

count()

Count elements in an array, or properties in an object.

Syntax

count($array, $mode );

Parameters
  • array-Required. Specifies an array
  • mode-Optional. Specifies the mode of the function.
<?php
   $a[0] = 10;
   $a[1] = 35;
   $a[2] = 50;
   
   $No_count = count($a);
   
   print($No_count);
?>

Run : http://ideone.com/TVH8PK

Tutorials Class - Output Window

3

array_chunk()

Chunks an array into size large chunks. The last chunk may contain less than size elements.

Syntax

array array_chunk ( array $input, int $size [, bool $preserve_keys] );

Parameters
  • input-The array to work on
  • size-The size of each chunk
  • preserve_keys-When set to TRUE keys will be preserved. Default is FALSE which will reindex the chunk numerically
<?php
   $array1 = array('a', 'b', 'c', 'd', 'e');
   print_r(array_chunk($array1, 2));
   print_r(array_chunk($array1, 2, true));
?>

Run: http://ideone.com/icVJAd

Tutorials Class - Output Window

Array
(
[0] => Array
(
[0] => a
[1] => b
)

[1] => Array
(
[0] => c
[1] => d
)

[2] => Array
(
[0] => e
)

)
Array
(
[0] => Array
(
[0] => a
[1] => b
)

[1] => Array
(
[2] => c
[3] => d
)

[2] => Array
(
[4] => e
)

)

array_unique

The array_unique() function removes duplicate values from an array. If two or more array values are the same, the first appearance will be kept and the other will be removed.

Syntax

array_unique ( $array );

Parameters
  • array1-Required. Specifies an array.
<?php
   $color = array("a" => "green", "red", "b" => "green", "blue", "red");
   $result = array_unique($color);
   
   print_r($color);
?>

Run : http://ideone.com/bCzu4S

Tutorials Class - Output Window

Array
(
[a] => green
[0] => red
[b] => green
[1] => blue
[2] => red
)

Sort Functions For Arrays

sort()

sort arrays in ascending order

<?php
$cars = array("Swift", "Honda City", "Elentra");
sort($cars);
print_r($cars);
?>

Run : http://ideone.com/epYYuF

Tutorials Class - Output Window

Array
(
[0] => Elentra
[1] => Honda City
[2] => Swift
)

rsort()

sort arrays in descending order

<?php
$cars = array("Swift", "Honda City", "Elentra");
rsort($cars);
print_r($cars);
?>

Run : http://ideone.com/XIUr2f

Tutorials Class - Output Window

Array
(
[0] => Swift
[1] => Honda City
[2] => Elentra
)

asort()

sort associative arrays in ascending order, according to the value

<?php
$age = array("john"=>"35", "smith"=>"37", "Joe"=>"43");
asort($age);
print_r($age);
?>

Run : http://ideone.com/EThDYb

Tutorials Class - Output Window

Array
(
[john] => 35
[smith] => 37
[Joe] => 43
)

ksort()

sort associative arrays in ascending order, according to the key

<?php
$age = array("john"=>"35", "smith"=>"37", "Joe"=>"43");
ksort($age);
print_r($age);
?>

Run : http://ideone.com/W47oLf

Tutorials Class - Output Window

Array
(
[Joe] => 43
[john] => 35
[smith] => 37
)

arsort()

sort associative arrays in descending order, according to the value

<?php
$age = array("john"=>"35", "smith"=>"37", "Joe"=>"43");
arsort($age);
print_r($age);
?>

Run : http://ideone.com/9YtqRL

Tutorials Class - Output Window

Array
(
[Joe] => 43
[smith] => 37
[john] => 35
)

krsort()

sort associative arrays in descending order, according to the key

<?php
$age = array("john"=>"35", "smith"=>"37", "Joe"=>"43");
krsort($age);
print_r($age);
?>

Run : http://ideone.com/g6bsJZ

Tutorials Class - Output Window

Array
(
[smith] => 37
[john] => 35
[Joe] => 43
)

Share this post:

Share on LinkedIn
Congratulations! Chapter Finished. Learn more about the similar topics:
Exercises & Assignments
No Content Found.
Interview Questions & Answers
No Content Found.