PHP shuffles the array usage and simple examples of shuffle function

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);
?>

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, after shuffle($arr) The results of print_r($arr) are all 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:

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

Running this example output:

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

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

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