Is there a function to make a copy of a PHP array to another

Question

Is there a function to make a copy of a PHP array to another   I have been burned a few times trying to copy PHP arrays  I want to copy an array defined inside an object to a global outside it

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When you do   array x    array y    PHP copies the array  so I m not sure how you would have gotten burned   For your case   global  foo   foo    obj- gt bar    should work fine   In order to get burned  I would think you d either have to have been using references or expecting objects inside the arrays to be cloned

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Since this wasn t covered in any of the answers and is now available in PHP 5 3  assumed Original Post was using 5 2    In order to maintain an array structure and change its values I prefer to use array replace or array replace recursive depending on my use case   http   php net manual en function array-replace php  Here is an example using array replace and array replace recursive demonstrating it being able to maintain the indexed order and capable of removing a reference   http   ideone com SzlBUZ  The code below is written using the short array syntax available since PHP 5 4 which replaces array   with     http   php net manual en language types array php  Works on either offset indexed and name indexed arrays    o1   new stdClass   a    d     This is the base array or the initial structure  o1- gt ar1     a    b     ca    cb      o1- gt ar1 3     amp   a    set 3rd offset to reference  a    direct copy  not passed by reference   o1- gt ar2    o1- gt ar1    alternatively array replace  o1- gt ar1        o1- gt ar1 0     z     set offset 0 of ar1   z do not change ar2  o1- gt ar1 3     e      a   e  changes value of 3rd offset to e in ar1 and ar2     copy and remove reference to 3rd offset of ar1 and change 2nd offset to a new array  o1- gt ar3   array replace  o1- gt ar1   2   gt    aa    3   gt   d        maintain original array of the 2nd offset in ar1 and change the value at offset 0   also remove reference of the 2nd offset   note  offset 3 and 2 are transposed  o1- gt ar4   array replace recursive  o1- gt ar1   3   gt   f   2   gt    bb       var dump  o1     Output     ar1    gt    array 4         0   gt      string 1   z       1   gt      string 1   b       2   gt      array 2           0   gt        string 2   ca         1   gt        string 2   cb             3   gt       amp string 1   e          ar2    gt    array 4         0   gt      string 1   a       1   gt      string 1   b       2   gt      array 2           0   gt        string 2   ca         1   gt        string 2   cb             3   gt       amp string 1   e          ar3    gt    array 4         0   gt      string 1   z       1   gt      string 1   b       2   gt      array 1           0   gt        string 2   aa             3   gt      string 1   d          ar4    gt    array 4         0   gt      string 1   z       1   gt      string 1   b       2   gt      array 2           0   gt        string 2   bb         1   gt        string 2   cb             3   gt      string 1   f

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I like array replace  or array replace recursive      cloned   array replace      YOUR ARRAY    It works like Object assign from JavaScript    original      foo    gt   bar    fiz    gt   baz       cloned   array replace      original    clonedWithReassignment   array replace      original    foo    gt   changed      clonedWithNewValues   array replace      original    add    gt   new       original  new      val     will result in     original     foo   bar   fiz   baz   new   val      cloned       foo   bar   fiz   baz      cloned with reassignment    foo   changed   fiz   baz      cloned with new values    foo   bar   fiz   baz   add   new

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This is the way I am copying my arrays in Php   function equal array  arr      ArrayObject   new ArrayObject  arr     return  ArrayObject- gt getArrayCopy          test   array  aa   bb  3    test2   equal array  test   print r  test2     This outputs   Array    0    gt  aa  1    gt  bb  2    gt  3

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If you have an array that contains objects  you need to make a copy of that array without touching its internal pointer  and you need all the objects to be cloned  so that you re not modifying the originals when you make changes to the copied array   use this   The trick to not touching the array s internal pointer is to make sure you re working with a copy of the array  and not the original array  or a reference to it   so using a function parameter will get the job done  thus  this is a function that takes in an array    Note that you will still need to implement   clone   on your objects if you d like their properties to also be cloned   This function works for any type of array  including mixed type    function array clone  array        return array map function  element            return   is array  element                 array clone  element                  is object  element                     clone  element                    element                                  array

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PHP will copy the array by default  References in PHP have to be explicit     a   array 1 2    b    a      b will be a different array  c    amp  a      c will be a reference to  a

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array merge   is a function in which you can copy one array to another in PHP

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Creates a copy of the ArrayObject   lt  php    Array of available fruits  fruits   array  lemons    gt  1   oranges    gt  4   bananas    gt  5   apples    gt  10     fruitsArrayObject   new ArrayObject  fruits    fruitsArrayObject  pears     4      create a copy of the array  copy    fruitsArrayObject- gt getArrayCopy    print r  copy      gt    from https   www php net manual en arrayobject getarraycopy php

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Safest and cheapest way I found is    lt  php   b   array values  a     This has also the benefit to reindex the array    This will not work as expected on associative array  hash   but neither most of previous answer

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simple and makes deep copy breaking all links   new unserialize serialize  old

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In PHP arrays are assigned by copy  while objects are assigned by reference  This means that    a   array     b    a   b  foo     42  var dump  a     Will yield   array 0        Whereas    a   new StdClass     b    a   b- gt foo   42  var dump  a     Yields   object stdClass  1  1        foo    gt    int 42      You could get confused by intricacies such as ArrayObject  which is an object that acts exactly like an array  Being an object however  it has reference semantics   Edit   AndrewLarsson raises a point in the comments below  PHP has a special feature called  references   They are somewhat similar to pointers in languages like C C    but not quite the same  If your array contains references  then while the array itself is passed by copy  the references will still resolve to the original target  That s of course usually the desired behaviour  but I thought it was worth mentioning

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arr one copy   array combine array keys  arr one    arr one    Just to post one more solution

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I know this as long time ago  but this worked for me     copied array   array slice  original array 0 count  original array

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private function cloneObject  mixed        switch  true            case is object  mixed               return clone  mixed          case is array  mixed               return array map array  this    FUNCTION      mixed           default              return  mixed

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lt  php function arrayCopy  array  array              result   array            foreach   array as  key   gt   val                 if  is array   val                        result  key    arrayCopy   val                  elseif   is object   val                        result  key    clone  val                else                    result  key     val                                  return  result      gt

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foreach  a as  key   gt   val   b  key     val     Preserves both key and values  Array  a  is an exact copy of array  b

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Define this    copy   create function   a    return  a       Copy   ARRAY to   ARRAY2      ARRAY2   array map  copy    ARRAY

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If you have only basic types in your array you can do this    copy   json decode  json encode  array   true     You won t need to update the references manually I know it won t work for everyone  but it worked for me

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In php array  you need to just assign them to other variable to get copy of that array  But first you need to make sure about it s type  whether it is array or arrayObject or stdObject   For Simple php array     a   array   data    gt  10      b    a   var dump  b    output   array 1      data    gt  10

[php] Is there a function to make a copy of a PHP array to another?

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