print_r(range(1,20));

输出，range产生

Array

(

[0] => 1

[1] => 2

[2] => 3

[3] => 4

[4] => 5

[5] => 6

[6] => 7

[7] => 8

[8] => 9

[9] => 10

[10] => 11

[11] => 12

[12] => 13

[13] => 14

[14] => 15

[15] => 16

[16] => 17

[17] => 18

[18] => 19

[19] => 20

)

 

$arr = range(1,20);shuffle($arr);print_r($arr);

shuffle将数组本身顺序打乱，将数组本身返回

以上输出：

Array

(

[0] => 19

[1] => 13

[2] => 20

[3] => 3

[4] => 14

[5] => 6

[6] => 7

[7] => 1

[8] => 2

[9] => 17

[10] => 18

[11] => 8

[12] => 4

[13] => 12

[14] => 15

[15] => 11

[16] => 9

[17] => 10

[18] => 16

[19] => 5

)

 

$arr = range(1,20);$str = implode('',$arr);echo str_shuffle($str)."\n";echo $str;

输出：

1016633281915412115171119042718

1234567891011121314151617181920

str_shuffle将字符串顺序打乱后，返回打乱后的字符串