Sort array of objects by object fields

Question

How can I sort this array of objects by one of its fields  like name or count      Array        0    gt  stdClass Object                        ID    gt  1              name    gt  Mary Jane              count    gt  420                 1    gt  stdClass Object                        ID    gt  2              name    gt  Johnny              count    gt  234                 2    gt  stdClass Object                        ID    gt  3              name    gt  Kathy              count    gt  4354

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if you re using php oop you might need to change to   public static function cmp  a   b         return strcmp  a- gt name   b- gt name        in this case FUNCTION NAME would be cmp usort  your data  array  YOUR CLASS NAME   FUNCTION NAME

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Downside of all answers here is that they use static field names  so I wrote an adjusted version in OOP style  Assumed you are using getter methods you could directly use this Class and use the field name as parameter  Probably someone find it useful   class CustomSort       public  field            public function cmp  a   b                               field for order is in a class variable  field            using getter function with naming convention getVariable   we set first letter to uppercase            we use variable variable names -  a- gt   varName   would directly access a field                     return strcmp  a- gt   get  ucfirst  this- gt field       b- gt   get  ucfirst  this- gt field                  public function sortObjectArrayByField  array   field                 this- gt field    field          usort  array  array  Your Namespace CustomSort    cmp              return  array

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Heres a nicer way using closures  usort  your data  function  a   b        return strcmp  a- gt name   b- gt name         Please note this is not in PHP s documentation but if you using 5 3  closures are supported where callable arguments can be provided

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Use usort  here s an example adapted from the manual  function cmp  a   b        return strcmp  a- gt name   b- gt name      usort  your data   quot cmp quot     You can also use any callable as the second argument  Here are some examples   Using anonymous functions  from PHP 5 3    usort  your data  function  a   b   return strcmp  a- gt name   b- gt name        From inside a class   usort  your data  array  this   quot cmp quot         quot cmp quot  should be a method in the class   Using arrow functions  from PHP 7 4    usort  your data  fn  a   b    gt  strcmp  a- gt name   b- gt name       Also  if you re comparing numeric values  fn  a   b    gt   a- gt count -  b- gt count as the  quot compare quot  function should do the trick  or  if you want yet another way of doing the same thing  starting from PHP 7 you can use the Spaceship operator  like this  fn  a   b    gt   a- gt count  lt   gt   b- gt count

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If you need local based string comparison  you can use strcoll instead of strcmp   Remeber to first use setlocale with LC COLLATE to set locale information if needed     usort  your data function  a  b       setlocale  LC COLLATE   pl PL UTF-8       Example of Polish language collation     return strcoll  a- gt name  b- gt name

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If you need to sort by only one field  then usort is a good choice  However  the solution quickly becomes messy if you need to sort by multiple fields  In this case  YaLinqo library  can be used  which implements SQL-like query syntax for arrays and objects  It has a pretty syntax for all cases    sortedByName           from  objects - gt orderBy   v- gt name     sortedByCount          from  objects - gt orderBy   v- gt count     sortedByCountAndName   from  objects - gt orderBy   v- gt count  - gt thenBy   v- gt name      Here    v- gt count  is a shorthand for function   v    return  v- gt count     either can be used   These method chains return iterators  but you can get arrays by adding - gt toArray   in the end if you need it     developed by me

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You can use sorted function from Nspl   use function  nspl a sorted  use function  nspl op propertyGetter  use function  nspl op methodCaller      Sort by property value  sortedByCount   sorted  objects  propertyGetter  count         Or sort by result of method call  sortedByName   sorted  objects  methodCaller  getName

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If everything fails here is another solution    names   array     foreach   my array as  my object         names      my object- gt name    any object field    array multisort  names  SORT ASC   my array    return  my array

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A simple alternative that allows you to determine dynamically the field on which the sorting is based    order by    name   usort  your data  function   a   b  use   order by        return strcmp  a- gt   order by    b- gt   order by          This is based on the Closure class  which allows anonymous functions  It is available since PHP 5 3

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This is what I have for a utility class  class Util       public static function sortArrayByName  amp  arrayToSort   meta            usort  arrayToSort  function  a   b  use   meta                return strcmp  a  meta    b  meta                          Call it   Util  sortArrayByName  array   array property name

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Thanks for the inspirations  I also had to add an external  translator parameter  usort  listable products  function  a   b        global  translator      return strcmp  a- gt getFullTitle  translator    b- gt getFullTitle  translator

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reference answer of Demodave to eating multi key  function array sort by array  arr   keys        if  is array  keys            keyList   explode       keys        keyList   array keys array flip  keyList       array unique       keyList   array reverse  keyList         result    amp  arr      foreach   keyList as  key            if array key exists  key   arr                result   usort  result  function  a   b  use   key    return strcmp  a- gt   key    b- gt   key                  return  result

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If you are using this inside Codeigniter  you can use the methods   usort  jobs  array  this- gt job model   sortJobs         function inside Model usort  jobs  array  this   sortJobs        Written inside Controller     rmooney thank you for the suggestion  It really helps me

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usort  array   my sort function     var dump  array    function my sort function  a   b        return  a- gt name  lt   b- gt name      The same code will be with the count field   More details about usort  http   ru2 php net usort  Btw  where did you get that array from  I hope that not from database

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You can use this function  works in PHP Version    5 3    function sortArrayByKey  amp  array  key  string   false  asc   true       if  string           usort  array function   a   b  use  amp  key  amp  asc                        if  asc     return strcmp strtolower  a  key    strtolower  b  key                 else        return strcmp strtolower  b  key    strtolower  a  key                      else          usort  array function   a   b  use  amp  key  amp  asc                        if  a  key      b  key   return 0               if  asc  return   a  key   lt   b  key     -1   1              else     return   a  key   gt   b  key     -1   1                         Example   sortArrayByKey  yourArray  name  true     String sort  ascending order  sortArrayByKey  yourArray  name  true false     String sort  descending order  sortArrayByKey  yourArray  id      number sort  ascending order  sortArrayByKey  yourArray  count  false false     number sort  descending order

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If you want to sort integer values      Desc sort usort  array function  first  second       return  first- gt number  lt   second- gt number          Asc sort usort  array function  first  second       return  first- gt number  gt   second- gt number        UPDATED with the string don t forget to convert to the same register  upper or lower      Desc sort usort  array function  first  second       return strtolower  first- gt text   lt  strtolower  second- gt text           Asc sort usort  array function  first  second       return strtolower  first- gt text   gt  strtolower  second- gt text

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array 0    array  key a    gt   z    key b    gt   c     array 1    array  key a    gt   x    key b    gt   b     array 2    array  key a    gt   y    key b    gt   a     function build sorter  key        return function   a   b  use   key            return strnatcmp  a  key    b  key              usort  array  build sorter  key b

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You can use usort  like this   usort  array function  first  second       return strcmp  first- gt name   second- gt name

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You can use usort like this  If you want to sort by number   function cmp  a   b        if   a     b            return 0            return   a  lt   b    -1   1      a   array 3  2  5  6  1    usort  a   cmp      Or Abc char   function cmp  a   b        return strcmp  a  fruit     b  fruit         fruits 0   fruit      lemons    fruits 1   fruit      apples    fruits 2   fruit      grapes    usort  fruits   cmp      See more  https   www php net manual en function usort php

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if you want to sort dates     usort  threads function  first  second           return strtotime  first- gt dateandtime   lt  strtotime  second- gt dateandtime

[php] Sort array of objects by object fields

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