How to Sort Multi-dimensional Array by Value

Question

How can I sort this array by the value of the  order  key  Even though the values are currently sequential  they will not always be   Array        0    gt  Array                        hashtag    gt  a7e87329b5eab8578f4f1098a152d6f4              title    gt  Flower              order    gt  3                 1    gt  Array                        hashtag    gt  b24ce0cd392a5b0b8dedc66c25213594              title    gt  Free              order    gt  2                 2    gt  Array                        hashtag    gt  e7d31fc0602fb2ede144d18cdffd816b              title    gt  Ready              order    gt  1

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This solution is for usort   with an easy-to-remember notation for multidimensional sorting  The spaceship operator  lt   gt  is used  which is available from PHP 7  usort  in function  a  b     return  a  first      lt   gt   b  first      first asc           a  second     lt   gt   b  second     second asc           b  third      lt   gt   a  third      third desc  a b swapped           etc          Examples   in         firstname    gt   Anton    surname    gt   Gruber    birthdate    gt   03 08 1967    rank    gt  3       firstname    gt   Anna    surname    gt   Egger    birthdate    gt   04 01 1960    rank    gt  1       firstname    gt   Paul    surname    gt   Mueller    birthdate    gt   15 10 1971    rank    gt  2       firstname    gt   Marie    surname    gt   Schmidt     birthdate    gt   24 12 1963    rank    gt  2       firstname    gt   Emma    surname    gt   Mueller    birthdate    gt   23 11 1969    rank    gt  2       first task  Order By rank asc  surname asc usort  in function  a  b     return  a  rank         lt   gt   b  rank         first asc           a  surname      lt   gt   b  surname      second asc          second task  Order By rank desc  surname asc  firstmame asc usort  in function  a  b     return  b  rank         lt   gt   a  rank           first desc           a  surname      lt   gt   b  surname        second asc           a  firstname    lt   gt   b  firstname      third asc          third task  Order By rank desc  birthdate asc The date cannot be sorted in this notation  It is converted with strtotime  usort  in function  a  b     return  b  rank         lt   gt   a  rank           first desc          strtotime  a  birthdate     lt   gt  strtotime  b  birthdate         second asc

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I usually use usort  and pass my own comparison function  In this case  it is very simple   function compareOrder  a   b      return  a  order   -  b  order      usort  array   compareOrder      In PHP 7 using spaceship operator   usort  array  function  a   b        return  a  order    lt   gt   b  order

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The most flexible approach would be using this method  Arr  sortByKeys array  array   keys  bool  assoc   true   array   here s why    You can sort by any key  also nested like  key1 key2 key3  or   k1    k2    k3    Works both on associative and not associative arrays   assoc flag  It doesn t use reference - return new sorted array   In your case it would be as simple as    sortedArray   Arr  sortByKeys  array   order      This method is a part of this library

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If anyone need sort according to key best is to use below usort  array  build sorter  order      function build sorter  key       return function   a   b  use   key          return strnatcmp  a  key    b  key

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function aasort   amp  array   key         sorter array         ret array        reset  array       foreach   array as  ii   gt   va             sorter  ii   va  key             asort  sorter       foreach   sorter as  ii   gt   va             ret  ii   array  ii              array  ret     aasort  your array  order

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Let s face it  php does NOT have a simple out of the box function to properly handle every array sort scenario   This routine is intuitive  which means faster debugging and maintenance      automatic population of array  tempArray   array     annotations   array           some code    SQL  sql retrieves result array  result      row 0  is the ID  but is populated out of order  comes from     multiple selects populating various dimensions for the same DATE     for example while  row   mysql fetch array  result          needle    row 0       arrayIndexes  needle       create a parallel array with IDs only      annotations  needle   someDimension      row 1      whatever   asort  tempArray   foreach   tempArray as  arrayKey         dataInOrder    annotations  arrayKey   someDimension                 more code    function arrayIndexes   needle        global  tempArray      if   in array  needle  tempArray             array push  tempArray  needle

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Use array multisort    array map    array multisort array map function  element          return  element  order          array   SORT ASC   array    print r  array     DEMO

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Try a usort  If you are still on PHP 5 2 or earlier  you ll have to define a sorting function first   function sortByOrder  a   b        return  a  order   -  b  order       usort  myArray   sortByOrder      Starting in PHP 5 3  you can use an anonymous function   usort  myArray  function  a   b        return  a  order   -  b  order          And finally with PHP 7 you can use the spaceship operator   usort  myArray  function  a   b        return  a  order    lt   gt   b  order          To extend this to multi-dimensional sorting  reference the second third sorting elements if the first is zero - best explained below  You can also use this for sorting on sub-elements   usort  myArray  function  a   b         retval    a  order    lt   gt   b  order        if   retval    0             retval    a  suborder    lt   gt   b  suborder            if   retval    0                 retval    a  details    subsuborder    lt   gt   b  details    subsuborder                        return  retval        If you need to retain key associations  use uasort   - see comparison of array sorting functions in the manual

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One approach to achieve this would be like this       new                                      hashtag    gt   a7e87329b5eab8578f4f1098a152d6f4                    title    gt   Flower                    order    gt  3                                                     hashtag    gt   b24ce0cd392a5b0b8dedc66c25213594                    title    gt   Free                    order    gt  2                                                     hashtag    gt   e7d31fc0602fb2ede144d18cdffd816b                    title    gt   Ready                    order    gt  1                                keys   array column  new   order         array multisort  keys  SORT ASC   new        var dump  new     Result       Array                0    gt  Array                                hashtag    gt  e7d31fc0602fb2ede144d18cdffd816b                  title    gt  Ready                  order    gt  1                         1    gt  Array                                hashtag    gt  b24ce0cd392a5b0b8dedc66c25213594                  title    gt  Free                  order    gt  2                         2    gt  Array                                hashtag    gt  a7e87329b5eab8578f4f1098a152d6f4                  title    gt  Flower                  order    gt  3

User · Answer

To sort the array by the value of the  title  key use   uasort  myArray  function  a   b        return strcmp  a  title     b  title           strcmp compare the strings   uasort   maintains the array keys as they were defined

User · Answer

I use this function    function array sort by column  amp  arr   col   dir   SORT ASC         sort col   array        foreach   arr as  key  gt   row             sort col  key     row  col              array multisort  sort col   dir   arr       array sort by column  array   order

User · Answer

sort   array     array lowercase   array map  strtolower    array to be sorted   array multisort  array lowercase  SORT ASC  SORT STRING   alphabetically ordered array     This takes care of both upper and lower case alphabets

[php] How to Sort Multi-dimensional Array by Value?

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