Three ways to generate random numbers in PHP_PHP Tutorial

Three ways to generate random numbers in php

How to use php to generate non-repeating random numbers between 1-10?

Example 1, use shuffle function to generate random numbers.

1

2	$arr=range(1,10);

3	shuffle($arr);

4	foreach($arr as $values)

5

{

6	echo $values." ";

7

}

8

?>

Example 2, use array_unique function to generate random numbers.

1

2	$arr=array();

3	while(count($arr)<10)

4

{

5	$arr[]=rand(1,10);

6	$arr=array_unique($arr);

7

}

8	echo implode(" ",$arr);

9

?>

Example 3, use array_flip function to generate random numbers, which can remove duplicate values.

01

02	$arr=array();

03	$count1=0;

04	$count = 0;

05	$return = array();

06	while ($count < 10)

07

{

08	$return[] = mt_rand(1, 10);

09	$return = array_flip(array_flip($return));

10	$count = count($return);

11	} //www.jbxue.com

12	foreach($return as $value)

13

{

14	echo $value." ";

15

}

16

echo " ";

17	$arr=array_values($return);// 获得数组的值

18	foreach($arr as $key)

19	echo $key." ";

20

?>

php random number generation function example

01

02	function randpw($len=8,$format='ALL'){

03	$is_abc = $is_numer = 0;

04	$password = $tmp ='';

05	switch($format){

06	case 'ALL':

07	$chars='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';

08

break;

09	case 'CHAR':

10	$chars='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';

11

break;

12	case 'NUMBER':

13	$chars='0123456789';

14

break;

15

default :

16	$chars='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';

17

break;

18	} // www.jbxue.com

19	mt_srand((double)microtime()*1000000*getmypid());

20	while(strlen($password)<$len){

21	$tmp =substr($chars,(mt_rand()%strlen($chars)),1);

22	if(($is_numer <> 1 && is_numeric($tmp) && $tmp > 0 )|| $format == 'CHAR'){

23	$is_numer = 1;

24

}

25	if(($is_abc <> 1 && preg_match('/[a-zA-Z]/',$tmp)) || $format == 'NUMBER'){

26	$is_abc = 1;

27

}

28	$password.= $tmp;

29

}

30	if($is_numer <> 1 || $is_abc <> 1 || empty($password) ){

31	$password = randpw($len,$format);

32

}

33	return $password;

34

}

35	for($i = 0 ; $i < 10; $i++){

36	echo randpw(8,'NUMBER');

37

echo " ";

38

}

http://www.bkjia.com/PHPjc/876453.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/876453.htmlTechArticleThree ways to generate random numbers in php How to use php to generate non-repeating random numbers between 1-10? Example 1, use shuffle function to generate random numbers. 1 ?php 2 $arr=range(1,10); 3 shuffle($arr); 4 fo...