php function Shuffle () the method of taking several random elements of an array to analyze _php techniques

This article illustrates the method of shuffle () of PHP function to take several random elements of an array. Share to everyone for your reference, specific as follows:

Sometimes we need to take a few random elements of the array (like doing random recommendation), so how does PHP work? A simpler solution is to use PHP's own shuffle () function. Here's a simple example:

$data [] = Array (
    "name" => "cloud-dwelling community",
    "Rank" => "
)";
$data [] = Array (
    "name" => "blog Park",
    "Rank" => ")"
;
$data [] = Array (
    "name" => "CSDN",
    "Rank" => ")"
;
$data [] = Array (
    "name" => "Iteye", "
    rank" => "M"
);
Shuffle ($data);
$i = 0;
foreach ($data as $key => $value) {
    if ($i < 2) {
        echo $data [$key] [' name ']. ' <br/> ';
    }
    $i + +;
}

Shuffle ()

The shuffle () function rearranges the elements in the array in random order. If successful, returns TRUE, otherwise returns FALSE. This function assigns a new key name to the cell in the array, which deletes the original key name and not just the reordering.

If you pass in an associative array, you will find that the key name of the associative array is missing. By the way, here's the solution:

Disrupting the sort function of associative arrays
Shuffle_assoc ($array)
{ 
  $randomized _keys = Array_rand ($array, Count ($array)); 
  foreach ($randomized _keys as $current _key)
  { 
    $output [$current _key] = $array [$current _key]; 
  } 
  return $output;
}

In addition, PHP also provides a function to randomly extract values from an array: Array_rand (), whose invocation format is as follows: Array_rand (array, number of elements extracted); Of course, to achieve the support of two-dimensional arrays also need to be encapsulated to use. But the previous program is a good support for two-dimensional arrays.

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I hope this article will help you with the PHP program design.