Giving my function access to outside variable

Question

I have an array outside     myArr   array      I would like to give my function access to the array outside it so it can add values to it  function someFuntion         myVal     some processing here to determine value of  myVal      myArr      myVal      How do I give the function the right scoping to the variable

User · Answer

The one and probably not so good way of achieving your goal would using global variables.

You could achieve that by adding global $myArr; to the beginning of your function. However note that using global variables is in most cases a bad idea and probably avoidable.

The much better way would be passing your array as an argument to your function:

function someFuntion($arr){
    $myVal = //some processing here to determine value of $myVal
    $arr[] = $myVal;
    return $arr;
}

$myArr = someFunction($myArr);

User · Answer

Global  myArr   myArr   array     function someFuntion        global  myArr        myVal     some processing here to determine value of  myVal      myArr      myVal      Be forewarned  generally people stick away from globals as it has some downsides   You could try this  function someFuntion  myArr        myVal     some processing here to determine value of  myVal      myArr      myVal      return  myArr     myArr   someFunction  myArr     That would make it so you aren t relying on Globals

User · Answer

Two Answers  1  Answer to the asked question   2  A simple change equals a better way   Answer 1 - Pass the Vars Array to the   construct   in a class  you could also leave the construct empty and pass the Arrays through your functions instead    lt  php     Create an Array with all needed Sub Arrays Example      Example Sub Array 1  content arrays  modals    array       Example Sub Array 2  content arrays  js custom     array        Create a Class class Array Pushing Example 1           Public to access outside of class     public  content arrays          Needed in the class only     private  push value 1      private  push value 2      private  push value 3      private  push value 4        private  values      private  external values          Primary Contents Array as Parameter in   construct     public function   construct  content arrays               Declare it          this- gt content arrays    content arrays                 Push Values from in the Array using Public Function     public function array push 1                Values          this- gt push values 1   array 1  2B or not 2B  3  42  5            this- gt push values 2   array  a   b   c                Loop Values and Push Values to Sub Array         foreach  this- gt push values 1 as  this- gt values                 this- gt content arrays  js custom        this- gt values                         Loop Values and Push Values to Sub Array         foreach  this- gt push values 2 as  this- gt values                 this- gt content arrays  modals        this- gt values                     Return Primary Array with New Values     return  this- gt content arrays                 GET Push Values External to the Class with Public Function     public function array push 2  external values             this- gt push values 3    external values  values 1             this- gt push values 4    external values  values 2                Loop Values and Push Values to Sub Array         foreach  this- gt push values 3 as  this- gt values                 this- gt content arrays  js custom        this- gt values                         Loop Values and Push Values to Sub Array         foreach  this- gt push values 4 as  this- gt values                 this- gt content arrays  modals        this- gt values                     Return Primary Array with New Values     return  this- gt content arrays                Start the Class with the Contents Array as a Parameter  content arrays   new Array Pushing Example 1  content arrays       Push Internal Values to the Arrays  content arrays- gt content arrays    content arrays- gt array push 1        Push External Values to the Arrays  external values   array     external values  values 1     array  car   house   bike   glass     external values  values 2     array  FOO   foo     content arrays- gt content arrays    content arrays- gt array push 2  external values       The Output echo  Array Custom Content Results 1   echo   lt br gt    echo   lt br gt     echo  Modals - Count    count  content arrays- gt content arrays  modals     echo   lt br gt    echo  -------------------   echo   lt br gt        Get Modals Array Results foreach  content arrays- gt content arrays  modals   as  modals        echo  modals      echo   lt br gt        echo   lt br gt    echo  JS Custom - Count    count  content arrays- gt content arrays  js custom     echo   lt br gt    echo  -------------------   echo   lt br gt        Get JS Custom Array Results foreach  content arrays- gt content arrays  js custom   as  js custom        echo  js custom      echo   lt br gt         echo   lt br gt       gt    Answer 2 - A simple change however would put it inline with modern standards  Just declare your Arrays in the Class    lt  php     Create a Class class Array Pushing Example 2           Public to access outside of class     public  content arrays          Needed in the class only     private  push value 1      private  push value 2      private  push value 3      private  push value 4        private  values      private  external values          Declare Contents Array and Sub Arrays in   construct     public function   construct                Declare them          this- gt content arrays  modals     array             this- gt content arrays  js custom     array                   Push Values from in the Array using Public Function     public function array push 1                Values          this- gt push values 1   array 1  2B or not 2B  3  42  5            this- gt push values 2   array  a   b   c                Loop Values and Push Values to Sub Array         foreach  this- gt push values 1 as  this- gt values                 this- gt content arrays  js custom        this- gt values                         Loop Values and Push Values to Sub Array         foreach  this- gt push values 2 as  this- gt values                 this- gt content arrays  modals        this- gt values                     Return Primary Array with New Values     return  this- gt content arrays                 GET Push Values External to the Class with Public Function     public function array push 2  external values             this- gt push values 3    external values  values 1             this- gt push values 4    external values  values 2                Loop Values and Push Values to Sub Array         foreach  this- gt push values 3 as  this- gt values                 this- gt content arrays  js custom        this- gt values                         Loop Values and Push Values to Sub Array         foreach  this- gt push values 4 as  this- gt values                 this- gt content arrays  modals        this- gt values                     Return Primary Array with New Values     return  this- gt content arrays                Start the Class without the Contents Array as a Parameter  content arrays   new Array Pushing Example 2        Push Internal Values to the Arrays  content arrays- gt content arrays    content arrays- gt array push 1        Push External Values to the Arrays  external values   array     external values  values 1     array  car   house   bike   glass     external values  values 2     array  FOO   foo     content arrays- gt content arrays    content arrays- gt array push 2  external values       The Output echo  Array Custom Content Results 1   echo   lt br gt    echo   lt br gt     echo  Modals - Count    count  content arrays- gt content arrays  modals     echo   lt br gt    echo  -------------------   echo   lt br gt        Get Modals Array Results foreach  content arrays- gt content arrays  modals   as  modals        echo  modals      echo   lt br gt        echo   lt br gt    echo  JS Custom - Count    count  content arrays- gt content arrays  js custom     echo   lt br gt    echo  -------------------   echo   lt br gt        Get JS Custom Array Results foreach  content arrays- gt content arrays  js custom   as  js custom        echo  js custom      echo   lt br gt         echo   lt br gt       gt    Both options output the same information and allow a function to push and retrieve information from an Array and sub Arrays to any place in the code Given that the data has been pushed first   The second option gives more control over how the data is used and protected  They can be used as is just modify to your needs but if they were used to extend a Controller they could share their values among any of the Classes the Controller is using  Neither method requires the use of a Global s    Output   Array Custom Content Results  Modals - Count  5  a  b  c  FOO  foo  JS Custom - Count  9  1  2B or not 2B  3  42  5  car  house  bike  glass

User · Answer

By default  when you are inside a function  you do not have access to the outer variables    If you want your function to have access to an outer variable  you have to declare it as global  inside the function    function someFuntion        global  myArr       myVal     some processing here to determine value of  myVal      myArr      myVal      For more informations  see Variable scope   But note that using global variables is not a good practice   with this  your function is not independant anymore    A better idea would be to make your function return the result    function someFuntion         myArr   array             At first  you have an empty array      myVal     some processing here to determine value of  myVal      myArr      myVal          Put that  myVal into the array     return  myArr      And call the function like this     result   someFunction       Your function could also take parameters  and even work on a parameter passed by reference    function someFuntion array  amp   myArr        myVal     some processing here to determine value of  myVal      myArr      myVal          Put that  myVal into the array     Then  call the function like this     myArr   array         someFunction  myArr       The function will receive  myArr  and modify it   With this     Your function received the external array as a parameter And can modify it  as it s passed by reference  And it s better practice than using a global variable   your function is a unit  independant of any external code     For more informations about that  you should read the Functions section of the PHP manual  and   especially  the following sub-sections     Functions arguments Returning values

User · Answer

foo   42   bar   function  x   0  use   foo       return  x    foo     var dump  bar 10       int 52    UPDATE  there is now support for arrow functions  but i will let for someone that used it more to create the answer

User · Answer

myArr   array     function someFuntion array  myArr         myVal     some processing here to determine value of  myVal      myArr      myVal       return  myArr      myArr   someFunction  myArr

[php] Giving my function access to outside variable

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