PHP Array Unique

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PHP Array Unique
Posted on: October 30, 2009 at 12:00 AM

PHP Array Unique:In this tutorial you will get to know about the array_unique() function. which eliminates the duplicate values. This tutorial has several examples, in which few of them are similar but has very minor but important differences.

PHP Array Unique

In PHP if we need to remove duplicate values then we can use array_unique() function. The functionality of it is to accept an array and returns another array without duplicate values.

General description of array_unique() is given below:

General Format	array array_unique(array $array [, int $sort_flags=sort_string] )
Parameters	array: Input array	sort_flags: The second optional parameter is used to compare items as follows SORT_REGULAR - Normal SORT_NUMERIC - Numerically SORT_STRING - As string SORT_LOCALE_STRING - As string, based on the current locale.
Return Value	Another array without duplicate values

Example 1:

<?php

$array1=array("a"=>"Apple","b"=>"Banana","o"=>"Orange","b"=>"Apple","b"=>"Apple");

echo " Initially the values of \$array1 is: ";

var_dump($array1);

echo" New array without duplicate values is: ";

print_r(array_unique($array1));

Output:

Initially the values of $array1 is:
array(3) {
  ["a"]=>
  string(5) "Apple"
  ["b"]=>
  string(5) "Apple"
  ["o"]=>
  string(6) "Orange"
}

New array without duplicate values is:
Array
(
    [a] => Apple
    [o] => Orange
)

Example 2:

<?php

$array1=array("Apple","Banana","Orange","Apple","Apple");

echo " Initially the values of \$array1 is: ";

var_dump($array1);

echo" New array without duplicate values is: ";

print_r(array_unique($array1));

Output:

Initially the values of $array1 is:
array(5) {
  [0]=>
  string(5) "Apple"
  [1]=>
  string(6) "Banana"
  [2]=>
  string(6) "Orange"
  [3]=>
  string(5) "Apple"
  [4]=>
  string(5) "Apple"
}

New array without duplicate values is:
Array
(
    [0] => Apple
    [1] => Banana
    [2] => Orange
)

Example 3:

<?php

$array1=array("a"=>"Apple","b"=>"Banana","o"=>"Orange","a"=>"Apple","a"=>"Apple");

echo " Initially the values of \$array1 is: ";

var_dump($array1);

echo" New array without duplicate values is: ";

print_r(array_unique($array1));

Output:

Initially the values of $array1 is:
array(3) {
  ["a"]=>
  string(5) "Apple"
  ["b"]=>
  string(6) "Banana"
  ["o"]=>
  string(6) "Orange"
}

New array without duplicate values is:
Array
(
    [a] => Apple
    [b] => Banana
    [o] => Orange
)

Example 4:

<?php

$array1=array(1=>"b",0=>"a","num"=>array(0=>"a",1=>"b",0=>"a"),2=>"b");

echo " Initially the values of \$array1 is: ";

print_r($array1);

echo" New array without duplicate values is: ";

print_r(array_unique($array1));

Output:

Initially the values of $array1 is:
Array
(
    [1] => b
    [0] => a
    [num] => Array
        (
            [0] => a
            [1] => b
        )

    [2] => b
)

New array without duplicate values is:
Array
(
    [1] => b
    [0] => a
    [num] => Array
        (
            [0] => a
            [1] => b
        )

)

Example 5:

<?php

$array1=array(1=>"b",0=>"a","num"=>array(0=>"a",1=>"b",0=>"a"),1=>"b");

echo " Initially the values of \$array1 is: ";

print_r($array1);

echo" New array without duplicate values is: ";

print_r(array_unique($array1));

Output:

Initially the values of $array1 is:
Array
(
    [1] => b
    [0] => a
    [num] => Array
        (
            [0] => a
            [1] => b
        )

)

New array without duplicate values is:
Array
(
    [1] => b
    [0] => a
    [num] => Array
        (
            [0] => a
            [1] => b
        )

)

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