How to get last key in an array

Question

How can I get the last key of an array

User · Answer

array   array       something    gt  array 1 2 3        somethingelse    gt  array 1 2 3 4       last value   end  array    last key   key  array       somethingelse    This works because PHP moves it s array pointer internally for  array

User · Answer

As of PHP    7 3 array key last   is the best way to get the last key of any of an array  Using combination of end    key   and reset   just to get last key of an array is outrageous    array   array  one    gt  bird   two    gt   fish   3   gt   elephant     key   array key last  array   var dump  key    output 3   compare that to  end  array   key   key  array  var dump  key    output 3 reset  array    You must reset array for the pointer to be at the beginning if you are using combination of end   and key

User · Answer

Since PHP 7 3  2018  there is  finally  function for this  http   php net manual en function array-key-last php   array     apple   gt 10  grape   gt 15  orange   gt 20   echo array key last    array     will output  orange

User · Answer

Just use   echo  array count  array  - 1

User · Answer

You can use this    array   array  one    gt   apple    two    gt   orange    three    gt   pear    end  array    echo key  array     Another Solution is to create a function and use it   function endKey  array   end  array   return key  array       array   array  one    gt   apple    two    gt   orange    three    gt   pear    echo endKey  array

User · Answer

Dont know if this is going to be faster or not  but it seems easier to do it this way  and you avoid the error by not passing in a function to end        it just needed a variable    not a big deal to write one more line of code  then unset it if you needed to    array   array       first    gt  123       second    gt  456       last    gt  789        keys   array keys  array    last   end  keys

User · Answer

I just took the helper-function from Xander and improved it with the answers before   function last  array      keys   array keys  array     return end  keys        arr   array  one    gt   apple    two    gt   orange    three    gt   pear        echo last  arr   echo  arr last  arr

User · Answer

A solution would be to use a combination of end and key  quoting      end   advances array  s internal pointer to the last element  and returns its value   key   returns the index element of the current array position     So  a portion of code such as this one should do the trick     array   array       first    gt  123       second    gt  456       last    gt  789       end  array              move the internal pointer to the end of the array  key   key  array       fetches the key of the element pointed to by the internal pointer  var dump  key     Will output    string  last   length 4    i e  the key of the last element of my array   After this has been done the array s internal pointer will be at the end of the array  As pointed out in the comments  you may want to run reset   on the array to bring the pointer back to the beginning of the array

User · Answer

Or in php  gt   7 3 0 you can use the function array key last   As described in php net     Gets the last key of an array https   www php net manual en function array-key-last php

User · Answer

I prefer   end array keys  myarr

User · Answer

The best possible solution that can be also used used inline   end  arr   amp  amp  false    key  arr    This solution is only expression statement and provides good is not the best possible performance   Inlined example usage    obj- gt setValue      end  arr   amp  amp  false    key  arr     last  arr key       UPDATE  In PHP 7 3   use  of course  the newly added array key last   method

User · Answer

arr   array  key1   gt  value1   key2   gt  value2   key3   gt  value3    list  last key    each array reverse  arr    print  last key     key3

User · Answer

Try this one with array reverse         arr   array        first    gt  01        second    gt  10        third    gt  20           key   key array reverse  arr     var dump  key

User · Answer

As of PHP7 3 you can directly access the last key in  the outer level of  an array with array key last    The definitively puts much of the debate on this page to bed   It is hands-down the best performer  suffers no side effects  and is a direct  intuitive  single-call technique to deliver exactly what this question seeks   A rough benchmark as proof  https   3v4l org hO1Yf   array slice     key     1 4 end     key            13 7 array key last          0 00015        test array contains 500000 elements  microtime repeated 100x then averaged then multiplied by 1000 to avoid scientific notation   Credit to  MAChitgarha for the initial benchmark commented under  TadejMagajna s answer    This means you can retrieve the value of the final key without    moving the array pointer  which requires two lines of code  or sorting  reversing  popping  counting  indexing an array of keys  or any other tomfoolery   This function was long overdue and a welcome addition to the array function tool belt that improves performance  avoids unwanted side-effects  and enables clean direct intuitive code   Here is a demo    array     a    gt   one    b    gt   two    c    gt   three    if   function exists  array key last          echo  please upgrade to php7 3     else       echo  First Key      key  array      n       echo  Last Key      array key last  array      n       next  array                      move array pointer to second element     echo  Second Key      key  array      n       echo  Still Last Key      array key last  array       Output   First Key  a Last Key  c         lt -- unaffected by the pointer position  NICE  Second Key  b Last Key  c         lt -- unaffected by the pointer position  NICE      Some notes    array key last   is the sibling function of array key first    Both of these functions are  pointer-ignorant   Both functions return null if the array is empty  Discarded sibling functions  array value first    amp  array value last    also would have offered the pointer-ignorant access to bookend elements  but they evidently failed to garner sufficient votes to come to life    Here are some relevant pages discussing the new features    https   laravel-news com outer-array-functions-php-7-3 https   kinsta com blog php-7-3  array-key-first-last https   wiki php net rfc array key first last   p s  If anyone is weighing up some of the other techniques  you may refer to this small collection of comparisons   Demo    Duration of array slice     key        0 35353660583496 Duration of end     key                6 7495584487915 Duration of array key last             0 00025749206542969 Duration of array keys     end         7 6123380661011 Duration of array reverse     key      6 7875385284424 Duration of array slice     foreach    0 28870105743408

User · Answer

Try using array pop and array keys function as follows    lt  php   array   array       one    gt  1       two    gt  2       three    gt  3     echo array pop array keys  array       prints three    gt

User · Answer

I would also like to offer an alternative solution to this problem   Assuming all your keys are numeric without any gaps  my preferred method is to count the array then minus 1 from that value  to account for the fact that array keys start at 0    array   array 0  gt  dog   1  gt  cat      lastKey   count  array -1   lastKeyValue    array  lastKey    var dump  lastKey   print r  lastKeyValue     This would give you      int 1    cat

User · Answer

It is strange  but why this topic is not have this answer     lastKey   array keys  array  count  array -1

User · Answer

Although end   seems to be the easiest  it s not the fastest  The faster  and much stronger alternative is array slice      lastKey   key array slice  array  -1  1  true      As the tests say  on an array with 500000 elements  it is almost 7x faster

[php] How to get last key in an array?

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