php array shuffled order

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:

<?php
$arr = range(1,8);
print_r($arr);
echo &#39;<br />&#39;;
shuffle($arr);
print_r($arr);
?>

Output:

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, it is no longer necessary to use functions such as srand() to seed the random number generator and the system will automatically complete it.

Example 2: Using associative array

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

Output:

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

Of course, the results output every time the page is refreshed are different.

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