How to pass an array into a function and return the results with an array

Question

So I m trying to learn how to pass arrays through a function  so that I can get around PHP s inability to return multiple values  Haven t been able to get anything to work so far  but here is my best try  Can anybody point out where I m going wrong   function foo  array         array 3   array 0   array 1   array 2       return  array      waffles 0  1   waffles 1  2   waffles 2  3  foo  waffles    echo  waffles 3     For clarification  I want to be able to pass multiple variables into a function  do something  then return multiple variables back out while keeping them seperate  This was just an example I was trying to get working as a work around for not being able to return multiple variables from an array

User · Answer

Another way is    NAME    John    EMAIL    John gmail com    USERNAME    John123    PASSWORD    1234    array   Array    NAME    EMAIL    USERNAME    PASSWORD    function getAndReturn  Array  array       return  array    print r getAndReturn  array

User · Answer

Here is how I do it  This way I can actually get a function to simulate returning multiple values   function foo  array          foreach  array as   key   gt    value                 str        key      value   amp              return  str   substr  str  0  -1          Set the variables to pass to function  in an Array          waffles  variable1      value1         waffles  variable2      value2         waffles  variable3      value3        Call Function         parse str  foo   waffles         Function returns multiple variable value pairs         echo  variable1    lt br gt        echo  variable2    lt br gt        echo  variable3    lt br gt      Especially usefull if you want  for example all fields in a database  to be returned as variables  named the same as the database table fields  See  db fields     function below    For example  if you have a query  select login  password  email from members table where id    id  Function returns multiple variables    login   password and  email  Here is the function   function db fields  field   filter   filter by    table    members table              This function will return as variable names  all fields that you request       and the field values assigned to the variables as variable values          filter by   TABLE FIELD TO FILTER RESULTS BY      filter    VALUE TO FILTER BY      table   TABLE TO RUN QUERY AGAINST      Returns single string value or ARRAY  based on whether user requests single     field or multiple fields       We return all fields as variable names  If multiple rows     are returned  check is array  return field   If  gt  0  it contains multiple rows      In that case  simply run parse str  return value  for each Array Item           field     field                    field       fields   explode      field         assoc array     count  fields   gt  0     1   0       if    assoc array             result   mysql fetch assoc mysql query  select  field from  table where  filter by     filter              return    field     result  field             else                query   mysql query  select  field from  table where  filter by     filter             while   row   mysql fetch assoc  query                 foreach  row as   key   gt    value                     str        key      value   amp                              return  str   substr  str  0  -1                       Below is a sample call to function  So  If we need to get User Data for say  user id   12345  from the members table with fields ID  LOGIN  PASSWORD  EMAIL    filter    user id   filter by    ID    table name    members table   parse str db fields  LOGIN  PASSWORD  EMAIL    filter   filter by   table name        This will return the following variables      echo  LOGIN    lt br gt    echo  PASSWORD    lt br gt    echo  EMAIL    lt br gt      We could also call like this   parse str db fields       filter   filter by   table name      The above call would return all fields as variable names

User · Answer

function foo Array  array         return  array

User · Answer

You are not able to return  multiple values  in PHP  You can return a single value  which might be an array   function foo  test1   test2   test3        return array  test1   test2   test3      test1    1    test2    2    test3    3     arr   foo  test1   test2   test3     test1    arr 0    test2    arr 1    test3    arr 2

User · Answer

i know a Class is a bit the overkill  class Foo     private  sum   NULL    public function   construct  array         this- gt sum      array     return  this       public function getSum          sum    this- gt sum     for  i 0  i lt count  sum   i                  get the last array index        res  i     sum  i     sum count  sum - i           return  res            fo   new Foo  myarray - gt getSum

User · Answer

Try   waffles   foo  waffles     Or pass the array by reference  like suggested in the other answers   In addition  you can add new elements to an array without writing the index  e g    waffles   array 1 2 3      filling on initialization   or   waffles   array     waffles     1   waffles     2   waffles     3    On a sidenote  if you want to sum all values in an array  use array sum

User · Answer

You seem to be looking for pass-by-reference  to do that make your function look this way  note the ampersand    function foo  amp  array         array 3   array 0   array 1   array 2       Alternately  you can assign the return value of the function to a variable   function foo  array         array 3   array 0   array 1   array 2       return  array      waffles   foo  waffles

User · Answer

I always return multiple values by using a combination of list   and array  s   function DecideStuffToReturn          IsValid   true       AnswerToLife   42          Build the return array      return array  IsValid   AnswerToLife         Part out the return array in to multiple variables  list  IsValid   AnswerToLife    DecideStuffToReturn      You can name them whatever you like  I chose to keep the function variables and the return variables the same for consistency but you can call them whatever you like   See list   for more information

User · Answer

You re passing the array into the function by copy  Only objects are passed by reference in PHP  and an array is not an object  Here s what you do  note the  amp    function foo  amp  arr      note the  amp     arr 3     arr 0   arr 1   arr 2      waffles   array 1 2 3   foo  waffles   echo  waffles 3     prints 6   That aside  I m not sure why you would do that particular operation like that  Why not just return the sum instead of assigning it to a new array element

[php] How to pass an array into a function, and return the results with an array

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