PHP shuffles the array. Usage and simple examples of shuffle function, shuffle

PHP shuffles the array usage and simple examples of shuffle function, shuffle

shuffle()

PHP shuffle() function randomly arranges the order of array cells (shuffles the array). This function assigns new keys to the elements in the array. This will delete the original keys rather than just reorder them.

Syntax:

bool shuffle (array &array)

Example 1:

<&#63;php
$arr = range(1,8);
print_r($arr);
echo '<br />';
shuffle($arr);
print_r($arr);
&#63;>

Output of running this example:

Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 [6] => 7 [7] => 8 ) 
Array ( [0] => 6 [1] => 1 [2] => 3 [3] => 2 [4] => 5 [5] => 7 [6] => 8 [7] => 4 ) 

It should be noted that every time the page is refreshed, the print_r($arr) result after shuffle($arr) is different. Since PHP 4.2.0, there is no longer a need to use functions such as srand() to seed the random number generator and the system will do it automatically.

Example 2, using associative array:

<&#63;php
$arr = array("a"=>1, "b"=>2, "c"=>3, "d"=>4, "e"=>5);
shuffle($arr);
print_r($arr);
&#63;>

Run this example output:

Array ( [0] => 5 [1] => 2 [2] => 1 [3] => 3 [4] => 4 )

Of course, the output results will be different every time you refresh the page.

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