Insert new item in array on any position in PHP

Question

How can I insert a new item into an array on any position  for example in the middle of array

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Based on  Halil great answer  here is simple function how to insert new element after a specific key  while preserving integer keys   private function arrayInsertAfterKey  array   afterKey   key   value        pos     array search  afterKey  array keys  array         return array merge          array slice  array  0   pos   preserve keys   true           array  key  gt  value           array slice  array   pos   preserve keys   true

User · Answer

You may find this a little more intuitive  It only requires one function call to array splice    original   array   a    b    c    d    e      inserted   array   x        not necessarily an array  see manual quote  array splice   original  3  0   inserted       splice in at position 3     original is now a b c x d e      If replacement is just one element it is not necessary to put array   around it  unless the element is an array itself  an object or NULL

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Hint for adding an element at the beginning of an array    a   array  first    second     a -1     i am the new first element     then   foreach  a as  aelem      echo  a          returns first  second  i am      but   for   i   -1   i  lt  count  a -1   i         echo  a          returns i am as 1st element

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There is no native PHP function  that I am aware of  that can do exactly what you requested    I ve written 2 methods that I believe are fit for purpose   function insertBefore  input   index   element        if   array key exists  index   input             throw new Exception  Index not found               tmpArray   array         originalIndex   0      foreach   input as  key   gt   value            if   key      index                 tmpArray      element              break                     tmpArray  key     value           originalIndex              array splice  input  0   originalIndex   tmpArray       return  input     function insertAfter  input   index   element        if   array key exists  index   input             throw new Exception  Index not found               tmpArray   array         originalIndex   0      foreach   input as  key   gt   value             tmpArray  key     value           originalIndex            if   key      index                 tmpArray      element              break                      array splice  input  0   originalIndex   tmpArray       return  input      While faster and probably more memory efficient  this is only really suitable where it is not necessary to maintain the keys of the array   If you do need to maintain keys  the following would be more suitable   function insertBefore  input   index   newKey   element        if   array key exists  index   input             throw new Exception  Index not found               tmpArray   array        foreach   input as  key   gt   value            if   key      index                 tmpArray  newKey     element                     tmpArray  key     value            return  input     function insertAfter  input   index   newKey   element        if   array key exists  index   input             throw new Exception  Index not found               tmpArray   array        foreach   input as  key   gt   value             tmpArray  key     value          if   key      index                 tmpArray  newKey     element                      return  tmpArray

User · Answer

This is also a working solution   function array insert  amp  array  element  position null      if  count  array     0         array      element        elseif  is numeric  position   amp  amp   position  lt  0        if  count  array  position   lt  0           array   array insert  array  element 0             else          array count  array   position     element              elseif  is numeric  position   amp  amp  isset  array  position           part1   array slice  array 0  position true        part2   array slice  array  position null true        array   array merge  part1 array  position  gt  element   part2       foreach  array as  key  gt  item          if  is null  item             unset  array  key                        elseif  is null  position          array      element          elseif   isset  array  position           array  position     element         array   array merge  array     return  array      credits go to  http   binarykitten com php 52-php-insert-element-and-shift html

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If you have regular arrays and nothing fancy  this will do  Remember  using array splice   for inserting elements really means insert before the start index  Be careful when moving elements  because moving up means  targetIndex -1  where as moving down means  targetIndex   1  class someArrayClass       private const KEEP EXISTING ELEMENTS   0       public function insertAfter array  array  int  startIndex   newElements                return  this- gt insertBefore  array   startIndex   1   newElements              public function insertBefore array  array  int  startIndex   newElements                return array splice  array   startIndex  self  KEEP EXISTING ELEMENTS   newElements

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a   array 1  2  3  4    b   array merge array slice  a  0  2   array 5   array slice  a  2        b   array 1  2  5  3  4

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You can try it  use this method to make it easy        array insert element on position         link https   vector cool         since 1 01 38        param array  original     param mixed  inserted     param int    position     return array     function array insert  amp  original   inserted  int  position   array       array splice  original   position  0  array  inserted        return  original       columns           name    gt           column    gt   item name          name    gt           column    gt   start time          name    gt           column    gt   full name          name    gt           column    gt   phone          name    gt           column    gt   create time       col     name    gt           column    gt   user id     columns   array insert  columns   col  3   print r  columns    Print out  Array        0    gt  Array                        name    gt                    column    gt  item name                1    gt  Array                        name    gt                    column    gt  start time                2    gt  Array                        name    gt                    column    gt  full name                3    gt  Array                        name    gt      1              column    gt  num of people                4    gt  Array                        name    gt                    column    gt  phone                5    gt  Array                        name    gt                    column    gt  user id                6    gt  Array                        name    gt                    column    gt  create time

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Try this one    colors   array  red    blue    yellow      colors   insertElementToArray  colors   green   2     function insertElementToArray  arr   array     element   null   index   0        if   element    null            return  arr              arrLength   count  arr        j    arrLength - 1       while   j  gt    index             arr  j 1     arr  j            j--              arr  index     element       return  arr

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This way you can insert arrays   function array insert  amp  array   value   index        return  array   array merge array splice  array  max 0   index - 1    array  value    array

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function array insert  array   position   insert        if   position  gt  0            if   position    1                array unshift  array  array               else                position    position - 1              array splice  array   position  0  array                                                        array  position     insert             return  array      Call example    array   array insert  array  1    123    abc

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This is what worked for me for the associative array         Inserts a new key value after the key in the array         param  key      The key to insert after      param  array      An array to insert in to      param  new key      The key to insert      param  new value      An value to insert         return      The new array if the key exists  FALSE otherwise         see array insert before       function array insert after  key  array  amp  array   new key   new value      if  array key exists  key   array          new   array        foreach   array as  k   gt   value           new  k     value        if   k      key             new  new key     new value                    return  new        return FALSE      The function source - this blog post  There s also handy function to insert BEFORE specific key

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if unsure  then DONT USE THESE    arr1    arr1    arr2    OR   arr1     arr2    because with   original array will be overwritten   see source

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function insert  amp  arr   value   index               lengh   count  arr       if  index lt 0   index gt  lengh          return       for  i  lengh   i gt  index   i--            arr  i     arr  i-1               arr  index     value

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Normally  with scalar values    elements   array  foo         array splice  array   position   length   elements     To insert a single array element into your array don t forget to wrap the array in an array  as it was a scalar value      element   array  key1   gt  value1     elements   array  element   array splice  array   position   length   elements     otherwise all the keys of the array will be added piece by piece

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If you want to keep the keys of the initial array and also add an array that has keys  then use the function below   function insertArrayAtPosition   array   insert   position                 array   The initial array i want to modify      insert   the new array i want to add  eg array  key    gt   value   or array  value        position   the position where the new array will be inserted into  Please mind that arrays start at 0            return array slice  array  0   position  TRUE     insert   array slice  array   position  NULL  TRUE       Call example    array   insertArrayAtPosition  array  array  key    gt   Value    3

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result array   array     array   array  quot Tim quot   quot John quot   quot Mark quot     new element    quot Bill quot    position   1    for   i 0   i lt count  array    i                if   i   position                      result array      new element                   result array      array  i          print r  result array        Result will Array  0    gt   quot Tim quot   1    gt   quot Bill quot    2    gt   quot John quot   1    gt   quot Mark quot

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A function that can insert at both integer and string positions           param array       array     param int string  position     param mixed       insert     function array insert  amp  array   position   insert        if  is int  position             array splice  array   position  0   insert         else            pos     array search  position  array keys  array             array   array merge              array slice  array  0   pos                insert              array slice  array   pos                       Integer usage    arr     one    two    three    array insert       arr      1       one-half        - gt  array     0   gt   one     1   gt   one-half     2   gt   two     3   gt   three       String Usage    arr          name     gt             type         gt   string            maxlength    gt   30               email    gt             type         gt   email            maxlength    gt   150              array insert       arr       email                  phone    gt                 type      gt   string                format    gt   phone                          - gt  array      name    gt    array        type    gt   string        maxlength    gt   30           phone    gt    array        type    gt   string        format    gt   phone           email    gt    array        type    gt   email        maxlength    gt   150

User · Answer

This can be done with array splice however  array splice fails when inserting an array or using a string key  I wrote a function to handle all cases  function array insert  amp  arr   index   val        if  is string  index            index   array search  index  array keys  arr        if  is array  val           array splice  arr   index  0    index   gt   val        else         array splice  arr   index  0   val

User · Answer

You can use this  foreach   array as  key   gt   value         if  key  1                 new array    other array                new array    value

User · Answer

Solution by jay lee is perfect  In case you want to add item s  to a multidimensional array  first add a single dimensional array and then replace it afterwards    original      0    gt  Array                title    gt  Speed          width    gt  14         1    gt  Array                title    gt  Date          width    gt  18         2    gt  Array                title    gt  Pineapple          width    gt  30            Adding an item in same format to this array will add all new array indexes as items instead of just item     new   array       title    gt   Time        width    gt  10    array splice  original 1 0 array  random string        can be more items  original 1     new      replaced with actual item   Note  Adding items directly to a multidimensional array with array splice will add all its indexes as items instead of just that item

User · Answer

For inserting elements into an array with string keys you can do something like this      insert an element after given array key     src   array    array to work with     ins   array   to insert in key  gt array format     pos   key that  ins will be inserted after      function array insert string keys  src  ins  pos          counter 1      foreach  src as  key  gt  s           if  key   pos               break                     counter                 array head   array slice  src 0  counter        array tail   array slice  src  counter         src   array merge  array head   ins        src   array merge  src   array tail        return  src

[php] Insert new item in array on any position in PHP

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