PHP Change Array Keys

Question

Is there a way to change all the numeric keys to  quot Name quot  without looping through the array  so a php function         0   gt   blabla       1   gt   blabla       2   gt   blblll          etc

User · Answer

Use array array flip in php   array   array    1    gt  Sell  2    gt  Buy  3    gt  Rent  4    gt  Jobs   print r array flip  array    Array    Sell    gt  1  Buy    gt  2  Rent    gt  3  Jobs    gt  4

User · Answer

I added this for an answer to another question and seemed relevant  Hopefully might help someone that needs to change the value of the keys in an array  Uses built-in functions for php    inputArray   array  app test    gt   test    app two    gt   two            Used to remap keys of an array by removing the prefix passed in        Example      inputArray   array  app test    gt   test    app two    gt   two        keys   array keys  inputArray      array walk  keys   removePrefix    app         remappedArray   array combine  keys   inputArray          param  value - key value to replace  should be from array keys     param  omit - unused  needed for prefix call     param  prefix - prefix to string replace in keys     function removePrefix  amp  value   omit   prefix         value   str replace  prefix       value         first get all the keys to remap  keys   array keys  inputArray       perform internal iteration with prefix passed into walk function for dynamic replace of key array walk  keys   removePrefix    app         combine the rewritten keys and overwrite the originals  remappedArray   array combine  keys   inputArray       see full output of comparison var dump  inputArray   var dump  remappedArray     Output   array 2       attr test    gt    string 4   test     attr two    gt    string 3   two    array 2       test    gt    string 4   test     two    gt    string 3   two

User · Answer

If you have an array of keys that you want to use then use array combine  Given  keys   array  a    b    c        and your array   list  then do this    list   array combine  keys  array values  list      List will now be array  a      blabla 1        etc   You have to use array values to extract just the values from the array and not the old  numeric  keys   That s nice and simple looking but array values makes an entire copy of the array so you could have space issues   All we re doing here is letting php do the looping for us  not eliminate the loop   I d be tempted to do something more like   foreach   list as  k   gt   v       unset   list  k         new key     some logic here       list  new key     v      I don t think it s all that more efficient than the first code but it provides more control and won t have issues with the length of the arrays

User · Answer

Use array array flip in php   array   array    1    gt  Sell  2    gt  Buy  3    gt  Rent  4    gt  Jobs   print r array flip  array    Array    Sell    gt  1  Buy    gt  2  Rent    gt  3  Jobs    gt  4

User · Answer

lt  php      array  new key     array  old key       unset  array  old key      gt

User · Answer

You could create a new array containing that array  so    lt  php  array   array     array  name      oldArray    gt

User · Answer

change array key name  group  to  children     lt  php echo json encode  data    function array change key name   orig   new   amp  array         foreach    array as  k   gt   v              res   k      orig    new    k        is array  v   is object  v     array change key name   orig   new   v      v              return  res     echo   lt br gt      change  group  to  children       lt br gt     new   array change key name  group    children     data   echo json encode  new     gt    result     benchmark     idText   USGCB-Windows-7   title   USGCB  Guidance for Securing Microsoft Windows 7 Systems for IT Professional   profile     idText   united states government configuration baseline version 1 2 0 0   title   United States Government Configuration Baseline 1 2 0 0   group     idText   security components overview   title   Windows 7 Security Components Overview   group     idText   new features   title   New Features in Windows 7       idText   usgcb security settings   title   USGCB Security Settings   group     idText   account policies group   title   Account Policies group                 change  group  to  children          benchmark     idText   USGCB-Windows-7   title   USGCB  Guidance for Securing Microsoft Windows 7 Systems for IT Professional   profile     idText   united states government configuration baseline version 1 2 0 0   title   United States Government Configuration Baseline 1 2 0 0   children     idText   security components overview   title   Windows 7 Security Components Overview   children     idText   new features   title   New Features in Windows 7       idText   usgcb security settings   title   USGCB Security Settings   children     idText   account policies group   title   Account Policies group

User · Answer

You could create a new array containing that array  so    lt  php  array   array     array  name      oldArray    gt

User · Answer

change array key name  group  to  children     lt  php echo json encode  data    function array change key name   orig   new   amp  array         foreach    array as  k   gt   v              res   k      orig    new    k        is array  v   is object  v     array change key name   orig   new   v      v              return  res     echo   lt br gt      change  group  to  children       lt br gt     new   array change key name  group    children     data   echo json encode  new     gt    result     benchmark     idText   USGCB-Windows-7   title   USGCB  Guidance for Securing Microsoft Windows 7 Systems for IT Professional   profile     idText   united states government configuration baseline version 1 2 0 0   title   United States Government Configuration Baseline 1 2 0 0   group     idText   security components overview   title   Windows 7 Security Components Overview   group     idText   new features   title   New Features in Windows 7       idText   usgcb security settings   title   USGCB Security Settings   group     idText   account policies group   title   Account Policies group                 change  group  to  children          benchmark     idText   USGCB-Windows-7   title   USGCB  Guidance for Securing Microsoft Windows 7 Systems for IT Professional   profile     idText   united states government configuration baseline version 1 2 0 0   title   United States Government Configuration Baseline 1 2 0 0   children     idText   security components overview   title   Windows 7 Security Components Overview   children     idText   new features   title   New Features in Windows 7       idText   usgcb security settings   title   USGCB Security Settings   children     idText   account policies group   title   Account Policies group

User · Answer

The solution to when you re using XMLWriter  native to PHP 5 2 x lt   is using  xml- gt startElement  itemName    this will replace the arrays key

User · Answer

To have the same key I think they must be in separate nested arrays   for   i   0   i  lt  count  array    i           newArray       name    gt   array  i         Output   0   gt  array 1   name    gt   blabla   1   gt  array 1   name    gt   blabla   2   gt  array 1   name    gt   blblll

User · Answer

prefix         arr   array combine      array map function  v  use   prefix          return  prefix  v         array keys  arr        array values  arr

User · Answer

No  there is not  for starters  it is impossible to have an array with elements sharing the same key   x  array      x  foo      bar      x  foo      baz     replaces  bar    Secondarily  if you wish to merely prefix the numbers so that    x 0  -- gt   x  foo 0       That is computationally implausible to do without looping  No php functions presently exist for the task of  key-prefixing   and the closest thing is  extract   which will prefix numeric keys prior to making them variables    The very simplest way is this    function rekey   input    prefix           out   array         foreach   input as  i   gt   v              if   is numeric   i                     out  prefix    i     v               continue                      out  i     v            return  out      Additionally  upon reading XMLWriter usage  I believe you would be writing XML in a bad way     lt section gt        lt foo 0 gt  lt  foo 0 gt      lt foo 1 gt  lt  foo 1 gt      lt bar gt  lt  bar gt      lt foo 2 gt  lt  foo 2 gt   lt  section gt    Is not good XML     lt section gt       lt foo gt  lt  foo gt      lt foo gt  lt  foo gt      lt bar gt  lt  bar gt      lt foo gt  lt  foo gt   lt  section gt    Is better XML  because when intrepreted  the names being duplicate don t matter because they re all offset numerically like so    section   gt         0   gt    foo            1   gt    foo            2   gt    bar            3   gt    foo

User · Answer

You could create a new array containing that array  so    lt  php  array   array     array  name      oldArray    gt

User · Answer

The solution to when you re using XMLWriter  native to PHP 5 2 x lt   is using  xml- gt startElement  itemName    this will replace the arrays key

User · Answer

To have the same key I think they must be in separate nested arrays   for   i   0   i  lt  count  array    i           newArray       name    gt   array  i         Output   0   gt  array 1   name    gt   blabla   1   gt  array 1   name    gt   blabla   2   gt  array 1   name    gt   blblll

User · Answer

The solution to when you re using XMLWriter  native to PHP 5 2 x lt   is using  xml- gt startElement  itemName    this will replace the arrays key

User · Answer

If you have an array of keys that you want to use then use array combine  Given  keys   array  a    b    c        and your array   list  then do this    list   array combine  keys  array values  list      List will now be array  a      blabla 1        etc   You have to use array values to extract just the values from the array and not the old  numeric  keys   That s nice and simple looking but array values makes an entire copy of the array so you could have space issues   All we re doing here is letting php do the looping for us  not eliminate the loop   I d be tempted to do something more like   foreach   list as  k   gt   v       unset   list  k         new key     some logic here       list  new key     v      I don t think it s all that more efficient than the first code but it provides more control and won t have issues with the length of the arrays

User · Answer

No  there is not  for starters  it is impossible to have an array with elements sharing the same key   x  array      x  foo      bar      x  foo      baz     replaces  bar    Secondarily  if you wish to merely prefix the numbers so that    x 0  -- gt   x  foo 0       That is computationally implausible to do without looping  No php functions presently exist for the task of  key-prefixing   and the closest thing is  extract   which will prefix numeric keys prior to making them variables    The very simplest way is this    function rekey   input    prefix           out   array         foreach   input as  i   gt   v              if   is numeric   i                     out  prefix    i     v               continue                      out  i     v            return  out      Additionally  upon reading XMLWriter usage  I believe you would be writing XML in a bad way     lt section gt        lt foo 0 gt  lt  foo 0 gt      lt foo 1 gt  lt  foo 1 gt      lt bar gt  lt  bar gt      lt foo 2 gt  lt  foo 2 gt   lt  section gt    Is not good XML     lt section gt       lt foo gt  lt  foo gt      lt foo gt  lt  foo gt      lt bar gt  lt  bar gt      lt foo gt  lt  foo gt   lt  section gt    Is better XML  because when intrepreted  the names being duplicate don t matter because they re all offset numerically like so    section   gt         0   gt    foo            1   gt    foo            2   gt    bar            3   gt    foo

User · Answer

The solution to when you re using XMLWriter  native to PHP 5 2 x lt   is using  xml- gt startElement  itemName    this will replace the arrays key

User · Answer

I did this for an array of objects  Its basically creating new keys in the same array and unsetting the old keys    public function transform  key   results        foreach  results as  k  gt  result                if  property exists  result   key                            results  result- gt  key     result              unset  results  k                         return  results

User · Answer

No  there is not  for starters  it is impossible to have an array with elements sharing the same key   x  array      x  foo      bar      x  foo      baz     replaces  bar    Secondarily  if you wish to merely prefix the numbers so that    x 0  -- gt   x  foo 0       That is computationally implausible to do without looping  No php functions presently exist for the task of  key-prefixing   and the closest thing is  extract   which will prefix numeric keys prior to making them variables    The very simplest way is this    function rekey   input    prefix           out   array         foreach   input as  i   gt   v              if   is numeric   i                     out  prefix    i     v               continue                      out  i     v            return  out      Additionally  upon reading XMLWriter usage  I believe you would be writing XML in a bad way     lt section gt        lt foo 0 gt  lt  foo 0 gt      lt foo 1 gt  lt  foo 1 gt      lt bar gt  lt  bar gt      lt foo 2 gt  lt  foo 2 gt   lt  section gt    Is not good XML     lt section gt       lt foo gt  lt  foo gt      lt foo gt  lt  foo gt      lt bar gt  lt  bar gt      lt foo gt  lt  foo gt   lt  section gt    Is better XML  because when intrepreted  the names being duplicate don t matter because they re all offset numerically like so    section   gt         0   gt    foo            1   gt    foo            2   gt    bar            3   gt    foo

User · Answer

I think that he want    a   array 1  gt  first name   2  gt  last name     a   array flip  a     a  first name     3   a   array flip  a    print r  a

User · Answer

I think that he want    a   array 1  gt  first name   2  gt  last name     a   array flip  a     a  first name     3   a   array flip  a    print r  a

User · Answer

If you have an array of keys that you want to use then use array combine  Given  keys   array  a    b    c        and your array   list  then do this    list   array combine  keys  array values  list      List will now be array  a      blabla 1        etc   You have to use array values to extract just the values from the array and not the old  numeric  keys   That s nice and simple looking but array values makes an entire copy of the array so you could have space issues   All we re doing here is letting php do the looping for us  not eliminate the loop   I d be tempted to do something more like   foreach   list as  k   gt   v       unset   list  k         new key     some logic here       list  new key     v      I don t think it s all that more efficient than the first code but it provides more control and won t have issues with the length of the arrays

User · Answer

prefix         arr   array combine      array map function  v  use   prefix          return  prefix  v         array keys  arr        array values  arr

User · Answer

I did this for an array of objects  Its basically creating new keys in the same array and unsetting the old keys    public function transform  key   results        foreach  results as  k  gt  result                if  property exists  result   key                            results  result- gt  key     result              unset  results  k                         return  results

User · Answer

If you have an array of keys that you want to use then use array combine  Given  keys   array  a    b    c        and your array   list  then do this    list   array combine  keys  array values  list      List will now be array  a      blabla 1        etc   You have to use array values to extract just the values from the array and not the old  numeric  keys   That s nice and simple looking but array values makes an entire copy of the array so you could have space issues   All we re doing here is letting php do the looping for us  not eliminate the loop   I d be tempted to do something more like   foreach   list as  k   gt   v       unset   list  k         new key     some logic here       list  new key     v      I don t think it s all that more efficient than the first code but it provides more control and won t have issues with the length of the arrays

User · Answer

No  there is not  for starters  it is impossible to have an array with elements sharing the same key   x  array      x  foo      bar      x  foo      baz     replaces  bar    Secondarily  if you wish to merely prefix the numbers so that    x 0  -- gt   x  foo 0       That is computationally implausible to do without looping  No php functions presently exist for the task of  key-prefixing   and the closest thing is  extract   which will prefix numeric keys prior to making them variables    The very simplest way is this    function rekey   input    prefix           out   array         foreach   input as  i   gt   v              if   is numeric   i                     out  prefix    i     v               continue                      out  i     v            return  out      Additionally  upon reading XMLWriter usage  I believe you would be writing XML in a bad way     lt section gt        lt foo 0 gt  lt  foo 0 gt      lt foo 1 gt  lt  foo 1 gt      lt bar gt  lt  bar gt      lt foo 2 gt  lt  foo 2 gt   lt  section gt    Is not good XML     lt section gt       lt foo gt  lt  foo gt      lt foo gt  lt  foo gt      lt bar gt  lt  bar gt      lt foo gt  lt  foo gt   lt  section gt    Is better XML  because when intrepreted  the names being duplicate don t matter because they re all offset numerically like so    section   gt         0   gt    foo            1   gt    foo            2   gt    bar            3   gt    foo

User · Answer

I added this for an answer to another question and seemed relevant  Hopefully might help someone that needs to change the value of the keys in an array  Uses built-in functions for php    inputArray   array  app test    gt   test    app two    gt   two            Used to remap keys of an array by removing the prefix passed in        Example      inputArray   array  app test    gt   test    app two    gt   two        keys   array keys  inputArray      array walk  keys   removePrefix    app         remappedArray   array combine  keys   inputArray          param  value - key value to replace  should be from array keys     param  omit - unused  needed for prefix call     param  prefix - prefix to string replace in keys     function removePrefix  amp  value   omit   prefix         value   str replace  prefix       value         first get all the keys to remap  keys   array keys  inputArray       perform internal iteration with prefix passed into walk function for dynamic replace of key array walk  keys   removePrefix    app         combine the rewritten keys and overwrite the originals  remappedArray   array combine  keys   inputArray       see full output of comparison var dump  inputArray   var dump  remappedArray     Output   array 2       attr test    gt    string 4   test     attr two    gt    string 3   two    array 2       test    gt    string 4   test     two    gt    string 3   two

User · Answer

lt  php      array  new key     array  old key       unset  array  old key      gt

User · Answer

You could create a new array containing that array  so    lt  php  array   array     array  name      oldArray    gt

[php] PHP Change Array Keys

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