php random x digit number

Question

I need to create a random number with x amount of digits   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  Could someone show me how this is done

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rand or mt rand will do     usage   rand min  max    mt rand min  max

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you people really likes to complicate things     the real problem is that the OP wants to  probably  add that to the end of some really big number  if not  there is no need I can think of for that to be required  as left zeros in any number is just  well  left zeroes   so  just append the larger portion of that number as a math sum  not string   e g    x    102384129    complex 3 digit random string     simply becomes   x   102384129000   rand 0  999    done

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I usually just use RAND   http   php net manual en function rand php  e g    rand   10000   99999      for your 5 digit random number

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This function works perfectly with no repeats and desired number of digits    digits       function randomDigits  length        numbers   range 0 9       shuffle  numbers       for  i   0   i  lt   length   i             global  digits           digits     numbers  i             return  digits      You can call the function and pass the number of digits for example    randomDigits 4     sample results      4957 8710 6730 6082 2987 2041 6721   Original script got from this gist

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rand 1000  9999   works more faster than x4 times rand 0 9    benchmark   rand 1000  9999         0 147 sec  rand 0 9 x4 times       0 547 sec    both functions was running in 100000 iterations to make results more explicit

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Treat your number as a list of digits and just append a random digit each time   function n digit random  digits       temp          for   i   0   i  lt   digits   i           temp    rand 0  9          return  int  temp        Or a purely numerical solution   function n digit random  digits    return rand pow 10   digits - 1  - 1  pow 10   digits  - 1

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this simple script will do    x   4   want number of digits for the random number  sum   0    for  i 0  i lt  x  i           sum    sum   rand 0 9  pow 10  i       echo  sum

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Please not that rand   does not generate a cryptographically secure value according to the docs   http   php net manual en function rand php     This function does not generate cryptographically secure values  and should not be used for cryptographic purposes  If you need a cryptographically secure value  consider using random int    random bytes    or openssl random pseudo bytes   instead    Instead it is better to use random int    available on PHP 7  See  http   php net manual en function random-int php    So to extend  Marcus s answer  you should use   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       Note that using rand   is fine if you don t need a secure random number

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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    Results after a couple of executions  98450 79324 23017 04317 26479   You can use the same code to generate random string also  like this   randomNum substr str shuffle  0123456789abcdefghijklmnopqrstvwxyzABCDEFGHIJKLMNOPQRSTVWXYZ    0   x     Results with  x   11  FgHmqpTR3Ox O9BsNgcPJDb 1v8Aw5b6H7f haH40dmAxZf 0EpvHL5lTKr

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do it with a loop   function randomWithLength  length         number           for   i   0   i  lt   length   i              number    rand 0 9              return  int  number

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function random number  size   5         random number          count 0      while   count  lt   size                           random digit   mt rand 0  9                random number     random digit               count                  return  random number

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You can use rand  min   max  for that exact purpose    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

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function random numbers  digits         min   pow 10   digits - 1        max   pow 10   digits  - 1      return mt rand  min   max       Tested here

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Well you can use as simple php function  mt rand 2000 9000  which can generate a 4 digit random number   mt rand 2000 9000

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This is another simple solution to generate random number of N digits    number of digits   10  echo substr number format time     mt rand   0        0  number of digits     Check it here  http   codepad org pyVvNiof

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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  lt   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  lt  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 gt 2                                  if  X-figure  number  X gt 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  lt    boundary dim     amp  amp    boundary dim gt 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         -------------------------------------------------------------------

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Following is simple method to generate specific length verification code  Length can be specified  by default  it generates 4 digit code   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

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The following code generates a 4 digits random number   echo sprintf    04d   rand 0 9999

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the simplest way i can think of is using rand function with str pad   lt  php echo str pad rand 0 999   5   0   STR PAD LEFT     gt    In above example   it will generate random number in range 0 to 999   And having 5 digits

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you can generate any x-digit random number with mt rand   function  mt rand   much faster with rand   function syntax   mt rand   or mt rand  min    max    read more  example    lt  php echo mt rand      gt

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You can use rand   together with pow   to make this happen    digits   3  echo rand pow 10   digits-1   pow 10   digits -1     This will output a number between 100 and 999  This because 10 2   100 and 10 3   1000 and then you need to subtract it with one to get it in the desired range   If 005 also is a valid example you d use the following code to pad it with leading zeros    digits   3  echo str pad rand 0  pow 10   digits -1    digits   0   STR PAD LEFT

[php] php random x digit number

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