php对数组内元素进行随机调换的方法

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

// I noticed that there is already a built-in function that

// does the same - so don't use mine ;-)

//

// --> shuffle($Array);

//

// http://de2.php.net/manual/de/function.shuffle.php

//

function RandomizeArray($array){

// error check:

$array = (!is_array($array)) ? array($array) : $array;

$a = array();

$max = count($array) + 10;

while(count($array) > 0){

$e = array_shift($array);

$r = rand(0, $max);

// find a empty key:

while (isset($a[$r])){

$r = rand(0, $max);

}

$a[$r] = $e;

}

ksort($a);

$a = array_values($a);

return $a;

}

1

2

3

4

5

6

7

8

9

10

11

12

/*

** Example:

*/

$test_array = array('why','dont','visit','www','jonas','john','de',':-)');

print implode(", ", $test_array);

print "\n";

print implode(", ", RandomizeArray($test_array));

/*

Example output:

why, dont, visit, www, jonas, john, de, :-)

www, de, jonas, john, visit, why, :-), dont

*/