How to get random value out of an array

Question

I have an array called  ran   array 1 2 3 4    I need to get a random value out of this array and store it in a variable  how can I do this

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A simple way to getting Randdom value form Array    color array    red   green   blue   light orange     color array rand 0 3    now every time you will get different colors from Array

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Get random values from an array  function random  array            Determine array is associative or not      keys   array keys  array        givenArrIsAssoc   array keys  keys       keys           if array is not associative then return random element     if   givenArrIsAssoc           return  array array rand  array                   If array is associative then       keys   array rand  array   number        results           foreach   array   keys as  key             results      array  key             return  results

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rand   rand 1 4     or  for arrays specifically    array   array  a value    another value    just some value    not some value     rand    array  rand 0  count  array -1

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I needed one line version for short array     array    1  2  3  4   mt rand 0  count  array  - 1     or if array is fixed    1  2  3  4  mt rand 0  3

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I m basing my answer off of    lafurWaage s function  I tried to use it but was running into reference issues when I had tried to modify the return object  I updated his function to pass and return by reference  The new function is   function  amp random value  amp  array   default null         k   mt rand 0  count  array  - 1       if  isset  array  k              return  array  k         else           return  default            For more context  see my question over at Passing Returning references to object   changing object is not working

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In my case  I have to get 2 values what are objects  I share this simple solution    ran   array  a   b   c   d     ranval   array map function  i  use  ran  return  ran  i    array rand  ran 2

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Use rand   to get random number to echo random key  In ex  0 - 3   ran   array 1 2 3 4   echo  ran rand 0 3

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The array rand function seems to have an uneven distribution on large arrays  not every array item is equally likely to get picked  Using shuffle on the array and then taking the first element doesn t have this problem    myArray   array 1  2  3  4  5       Random shuffle shuffle  myArray       First element is random now  randomValue    myArray 0

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You can use mt rand     random    ran mt rand 0  count  ran  - 1      This comes in handy as a function as well if you need the value  function random value  array   default null         k   mt rand 0  count  array  - 1       return isset  array  k     array  k    default

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PHP provides a function just for that  array rand   http   php net manual en function array-rand php   ran   array 1 2 3 4    randomElement    ran array rand  ran  1

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On-liner   echo  array array rand  array 1

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You could use the array rand function to select a random key from your array like below    array   array  one    two    three    four    five    six    echo  array array rand  array  1        or you could use the rand and count functions to select a random index    array   array  one    two    three    four    five    six    echo  array rand 0  count  array  - 1

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Does your selection have any security implications  If so  use random int   and array keys     random bytes   is PHP 7 only  but there is a polyfill for PHP 5    function random index array  source         max   count  source  - 1       r   random int 0   max        k   array keys  source       return  k  r       Usage    array          apple    gt    1234       boy      gt    2345       cat      gt    3456       dog      gt    4567       echo     gt    5678       fortune    gt  6789     i   random index  array   var dump   i   array  i       Demo  https   3v4l org 1joB1

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Another approach through flipping array to get direct value   Snippet   array      Name1    gt   John    Name2    gt   Jane    Name3    gt   Jonny      val   array rand array flip  array      array rand return key not value  So  we re flipping value as key   Note   PHP key alway be an unique key  so when array is flipped  duplicate value as a key will be overwritten

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value    array array rand  array

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You can also do just    k   array rand  array    v    array  k     This is the way to do it when you have an associative array

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You get a random number out of an array as follows    randomValue    rand array rand  rand 1

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Derived from Laravel Collection  random     function array random  array   amount   1         keys   array rand  array   amount        if   amount    1            return  array  keys               results           foreach   keys as  key             results      array  key              return  results      Usage    items     foo    bar    baz    lorem   gt  ipsum     array random  items       bar  array random  items  2        foo    ipsum     A few notes     amount has to be less than or equal to count  array   array rand   doesn t shuffle keys  since PHP 5 2 10  see 48224   so your picked items will always be in original order  Use shuffle   afterwards if needed     Documentation  array rand    shuffle     edit  The Laravel function has noticeably grown since then  see Laravel 5 4 s Arr  random    Here is something more elaborate  derived from the grown-up Laravel function   function array random  array   number   null         requested     number     null    1    number       count   count  array        if   requested  gt   count            throw new  RangeException               You requested   requested  items  but there are only   count  items available                         if   number     null            return  array array rand  array               if   int   number     0            return                 keys    array  array rand  array   number         results           foreach   keys as  key             results      array  key              return  results      A few highlights    Throw exception if there are not enough items available array random  array  1  returns an array of one item   19826  Support value  0  for the number of items   20439

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One line   ran rand 0  count  ran  - 1

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This will work nicely with in-line arrays  Plus  I think things are tidier and more reusable when wrapped up in a function   function array rand value  a        return  a array rand  a        Usage   array rand value array  a    b    c    d       On PHP  lt  7 1 0  array rand   uses rand    so you wouldn t want to this function for anything related to security or cryptography  On PHP 7 1 0   use this function without concern since rand   has been aliased to mt rand

[php] How to get random value out of an array?

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