How to remove duplicate elements from array in PHP?

#How to remove duplicate elements from an array in PHP?

In PHP, you can use the "array_filter()" function to remove duplicate elements from an array. This function uses a callback function to filter the units in the array. Its syntax is "array_filter(array)", and its parameter array Indicates the array to be filtered, and the return value is the filtered array.

Sample code

<?php
function odd($var)
{
    // returns whether the input integer is odd
    return($var & 1);
}
function even($var)
{
    // returns whether the input integer is even
    return(!($var & 1));
}
$array1 = array("a"=>1, "b"=>2, "c"=>3, "d"=>4, "e"=>5);
$array2 = array(6, 7, 8, 9, 10, 11, 12);
echo "Odd :\n";
print_r(array_filter($array1, "odd"));
echo "Even:\n";
print_r(array_filter($array2, "even"));
?>

The above routine will output:

Odd:

Array
(
    [a] => 1
    [c] => 3
    [e] => 5
)
Even:
Array
(
    [0] => 6
    [2] => 8
    [4] => 10
    [6] => 12
)

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