PHP: shuffle() function

Last update on August 19 2022 21:50:39 (UTC/GMT +8 hours)

PHP: Shuffle an array

The shuffle() function is used to randomize the order of the elements in the array. The function assigns new keys to the elements in array.

Note: The function uses a pseudo-random number generator that is not suitable for cryptographic purposes.

Version:

(PHP 4 and above)

Syntax:

shuffle(array_name)

Parameter:

Name	Description	Required / Optional	Type
array_name	The input array.	Required	Array

Return value:

TRUE on success or FALSE on failure.

Value Type: Boolean.

Example:

<?php
$country_list = array(1 => "India", 2 => "USA", 3 => "Uk");
shuffle($country_list);
print_r($country_list);
?>

Output:

Array ( [0] => Uk [1] => USA [2] => India )

Pictorial Presentation:

php function reference: shuffle() function

Note: Since shuffle() function randomize the order of the elements in an array every time you run it, your output may vary from the Pictorial as well the output shown under Output of the example in this tutorial.

View the example in the browser

Practice here online :

See also

PHP Function Reference

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PHP: Tips of the Day

Filters the collection using the given callback

Example:

<?php
function tips_reject($items, $func)
{
  return array_values(array_diff($items, array_filter($items, $func)));
}

print_r(tips_reject(['Apple', 'Pear', 'Kiwi', 'Banana'], function ($item) {
  return strlen($item) > 4;
}));
?>

Output:

Array
(
    [0] => Pear
    [1] => Kiwi
)