How to Remove Array Element and Then Re-Index Array

Question

I have some troubles with an array  I have one array that I want to modify like below  I want to remove element  elements  of it by index and then re-index array  Is it possible    foo   array        whatever       0       foo       1       bar      2        foo2   array        foo       0   before  1       bar      1   before  2

User · Answer

array splice  array  0  1     http   php net manual en function array-splice php

User · Answer

In addition to xzyfer s answer  The function  function custom unset  amp  array array     key 0        if isset  array  key                 remove item at index         unset  array  key                 reindex  array          array   array values  array              alternatively            array   array merge  array               return  array      Use   my array array      0  gt  test0        1  gt  test1        2  gt  test2      custom unset  my array  1     Result   array 2         0   gt      string 5   test0       1   gt      string 5   test2

User · Answer

Unset  array 0      Sort  array        I don t know why this is being downvoted  but if anyone has bothered to try it  you will notice that it works   Using sort on an array reassigns the keys of the the array  The only drawback is it sorts the values   Since the keys will obviously be reassigned  even with array values  it does not matter is the values are being sorted or not

User · Answer

unset  foo 0       remove item at index 0  foo2   array values  foo       reindex  array

User · Answer

2020 Benchmark in PHP 7 4 For these who are not satisfied with current answers  I did a little benchmark script  anyone can run from CLI  We are going to compare two solutions  unset   with array values   VS array splice     lt  php  echo  php v    phpversion      quot  n quot     itemsOne        itemsTwo           populate items array with 100k random strings for   i   0   i  lt  100000   i           itemsOne      itemsTwo     sha1 uniqid true        start   microtime true    for   i   0   i  lt  10000   i          unset  itemsOne  i         itemsOne   array values  itemsOne       end   microtime true    echo  unset  amp  array values        end -  start     s     quot  n quot     start   microtime true    for   i   0   i  lt  10000   i          array splice  itemsTwo   i  1       end   microtime true    echo  array splice        end -  start     s     quot  n quot     As you can see the idea is simple   Create two arrays both with the same 100k items  randomly generated strings  Remove 10k first items from first array using unset   and array values   to reindex Remove 10k first items from second array using array splice   Measure time for both methods  Output of the script above on my Dell Latitude i7-6600U 2 60GHz x 4 and 15 5GiB RAM  php v7 4 8 unset  amp  array values  29 089932918549s array splice  17 94264793396s  Verdict  array splice is almost twice more performant than unset and array values  So  array splice is the winner

User · Answer

Try with    foo2   array slice  foo  1

User · Answer

After some time I will just copy all array elements  excluding these unwanted  to new array

User · Answer

array splice  array  array search array value   array   1

User · Answer

If you use array merge  this will reindex the keys  The manual states       Values in the input array with numeric keys will be renumbered with   incrementing keys starting from zero in the result array    http   php net manual en function array-merge php  This is where i found the original answer   http   board phpbuilder com showthread php 10299961-Reset-index-on-array-after-unset

User · Answer

You better use array shift    That will return the first element of the array  remove it from the array and re-index the array  All in one efficient method

[php] How to Remove Array Element and Then Re-Index Array?

Examples related to php

Examples related to arrays

Examples related to indexing