Question

我需要随机抽出数字×数字。

So lets say x is 5, I need a number to be eg. 35562 If x is 3, then it would throw back something like; 463

难道有人能向我表明如何做到这一点?

Answer 1

您可使用rel=“noretinger”>rand(),与pow(><>>>>>a>一起实现:

$digits = 3;
echo rand(pow(10, $digits-1), pow(10, $digits)-1);

这一数字在100至999之间。这是因为10^2 = 100和10^3=1000,因此,你需要将其与他人分离,以达到预期的范围。

如果 005也是个有效的例子,你就使用以下代码将其排列为零:

$digits = 3;
echo str_pad(rand(0, pow(10, $digits)-1), $digits,  0 , STR_PAD_LEFT);

Answer 2

我通常只使用RAND(http://php.net/manual/en/Function.rand.php” rel=“noreferer”>。 http://php.net/manual/en/Function.rand.php

e.g.

rand ( 10000 , 99999 );

页: 1

Answer 3

Here is a simple solution without any loops or any hassle which will allow you to create random string with characters, numbers or even with special symbols.

$randomNum = substr(str_shuffle("0123456789"), 0, $x);

where $x can be number of digits

Eg. substr(str_shuffle("0123456789"), 0, 5);

一起处决后的结果

你们也可以使用同样的法典来进行随机扼杀。

$randomNum=substr(str_shuffle("0123456789abcdefghijklmnopqrstvwxyzABCDEFGHIJKLMNOPQRSTVWXYZ"), 0, $x);

<代码>x = 11

FgHmqpTR3Ox
O9BsNgcPJDb
1v8Aw5b6H7f
haH40dmAxZf
0EpvHL5lTKr

Answer 4

您可为此目的使用。

In order to limit the values to values with x digits you can use the following:

$x = 3; // Amount of digits
$min = pow(10,$x);
$max = pow(10,$x+1)-1);
$value = rand($min, $max);

Answer 5

1. 逐位标出数字,每当一位随机数字:

function n_digit_random($digits) {
  $temp = "";

  for ($i = 0; $i < $digits; $i++) {
    $temp .= rand(0, 9);
  }

  return (int)$temp;
}

或纯粹的数字解决办法:

function n_digit_random($digits)
  return rand(pow(10, $digits - 1) - 1, pow(10, $digits) - 1);
}

Answer 6

一种最简单的思路是使用<代码>rand的功能str_pad。

<?php
echo str_pad(rand(0,999), 5, "0", STR_PAD_LEFT);
?>

在上述例子中,它将在0至999范围内生成随机编号。

并且有<>5位数。

Answer 7

function random_numbers($digits) {
    $min = pow(10, $digits - 1);
    $max = pow(10, $digits) - 1;
    return mt_rand($min, $max);
}

测试here。

Answer 8

rand(1000, 9999); works more faster than x4 times rand(0,9);

基准:

rand(1000, 9999)      : 0.147 sec.
rand(0,9)x4 times     : 0.547 sec.

这两项职能都在100 000英亩,使成果更加明确

Answer 9

你们也可以使用简单易变的实验室功能mt_rand(2000年,9000),从而产生4位数的随机数字。

mt_rand(2000,9000)

Answer 10

您可生成任何以<代码>mt_rand()功能为单位的随机数字。

<代码>mt_rand(>>比rand(>>快。

Simtax :mt_rand( or mt_rand($min ,$max)。

例:<?php remt_rand();?>

Answer 11

a)

function randomWithLength($length){

    $number =   ;
    for ($i = 0; $i < $length; $i++){
        $number .= rand(0,9);
    }

    return (int)$number;

}

Answer 12

rand or mt_rand will do...

使用:

rand(min, max);

mt_rand(min, max);

Answer 13

function random_number($size = 5)
{
    $random_number=  ;
    $count=0;
    while ($count < $size ) 
        {
            $random_digit = mt_rand(0, 9);
            $random_number .= $random_digit;
            $count++;
        }
    return $random_number;  
}

Answer 14

下面是制定具体长度核查守则的简单方法。可以通过违约确定长度,产生4位数字代码。

function get_sms_token($length = 4) {

    return rand(
        ((int) str_pad(1, $length, 0, STR_PAD_RIGHT)),
        ((int) str_pad(9, $length, 9, STR_PAD_RIGHT))
    );
}

echo get_sms_token(6);

Answer 15

this simple script will do

$x = 4;//want number of digits for the random number
$sum = 0;


for($i=0;$i<$x;$i++)
{
    $sum = $sum + rand(0,9)*pow(10,$i);

}

echo $sum;

Answer 16

这是生成随机数字的另一个简单解决办法:

$number_of_digits = 10;
echo substr(number_format(time() * mt_rand(),0,  ,  ),0,$number_of_digits);

http://codepad.org/pyVvNiof“rel=“nofollow”http://codepad.org/pyVvNiof。

Answer 17

function rand_number_available($already_mem_array,$boundary_min,$boundary_max,$digits_num)
{

    $already_mem_array_dim = count($already_mem_array);         // dimension of array, that contain occupied elements

    // --- creating Boundaries and possible Errors
    if( empty($digits_num) ){   
            $boundary_dim = $boundary_max - $boundary_min;
            if($boundary_dim <= 0){
                $error = -1;                                    // Error that might happen. Difference between $boundary_max and $boundary_min must be positive
            }else{
                $error = -2;                                    // Error that might happen. All numbers between, $boundary_min and $boundary_max , are occupied, by $already_mem_array
            }                                   
    }else{
            if($digits_num < 0){                                // Error. If exist, $digits_num must be, 1,2,3 or higher
                $error = -3; 
            }elseif($digits_num == 1){                          // if  one-figure  number
                $error = -4;                                    // Error that might happen. All  one-figure  numbers    are occupied, by $already_mem_array
                $boundary_min = 0;
                $boundary_max = 9;
                $boundary_dim = $boundary_max-$boundary_min;
            }elseif($digits_num == 2){                          // if  two-figure  number
                $error = -5;                                    // Error that might happen. All  two-figure  numbers    are occupied, by $already_mem_array
                $boundary_min = 10;
                $boundary_max = 99;
                $boundary_dim = $boundary_max-$boundary_min;
            }elseif($digits_num>2){                             // if  X-figure  number. X>2
                $error = -6;                                    // Error that might happen. All  X-figure  numbers  are occupied, by $already_mem_array. Unlikely to happen
                $boundary_min = pow(10, $digits_num-1);         // stepenovanje - graduation
                $boundary_max = pow(10, $digits_num)-1;
                $boundary_dim = $boundary_max-$boundary_min;
            }

    }
    // -------------------------------------------------------------------


    // --- creating response ---------------------------------------------
    if( ($already_mem_array_dim <= $boundary_dim)   &&  $boundary_dim>0 ){              // go here only if, there are AVAILABLE numbers to extract, and [difference] $boundary_dim , is positive
        do{
            $num = rand($boundary_min,$boundary_max);
        }while( in_array($num, $already_mem_array) );
        $result = $num;
    }else{
        $result = $error;                                       // Limit that happened  
    }

    return $result;
    // -------------------------------------------------------------------

}

Answer 18

这一职能完全没有重复和希望的数字。

$digits =   ;
function randomDigits($length){
    $numbers = range(0,9);
    shuffle($numbers);
    for($i = 0; $i < $length; $i++){
        global $digits;
        $digits .= $numbers[$i];
    }
    return $digits;
}

您可以称职,通过数位数,例如:

randomDigits(4);

样本结果:

4957 8710 6730 6082 2987 2041 6721

原文摘自

Answer 19

请不要说<代码>rand()没有根据 docs产生加密安全价值:

http://php.net/manual/en/Function.rand.php>rel=“nofollow noreferer”> http://php.net/manual/en/Function.rand.php

这一功能不会产生加密上的安全价值,不应用于加密目的。如果你需要加密安全的价值,则考虑使用随机(int)、随机(bytes)或开诚_random_pseudo_bytes(a)。

Instead it is better to use random_int(), available on PHP 7 (See: http://php.net/manual/en/function.random-int.php).

为了扩大“马克斯”的答复,你应使用:

function generateSecureRandomNumber($digits): int {
   return random_int(pow(10, $digits - 1), pow(10, $digits) - 1);
}

function generateSecureRandomNumberWithPadding($digits): string {
   $randomNumber = random_int(0, pow(10, $digits) - 1);
   return str_pad($randomNumber, $digits,  0 , STR_PAD_LEFT);
}

请注意,如果您不需要安全随机编号,则使用<代码>rand(>)。

Answer 20

下面的编码生成4位数的随机数字:

echo sprintf( "%04d", rand(0,9999));

Answer 21

你们的人真心想使事情复杂化:

真正的问题是,在有些实际数量大的末尾,被占领土可能还要增加。如果没有,我就没有必要这样做。由于任何数目的零点都是空洞的。

因此,仅将这一数字的较大部分作为数学数额,而不加以说明。

e.g.

$x = “102384129” .rig_3_数_random_string();

简单明了

$x = 102384129000 + rand(0, 999);

已完成。

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