PHP - Check if two arrays are equal

Question

I d like to check if two arrays are equal  I mean  same size  same index  same values  How can I do that   Using     as suggested by a user  I expect that the following would print enter if at least one element in the array s  are different  but in fact it does not   if     POST  atlOriginal        oldAtlPosition       or    POST  atl        aext       or    POST  sidesOriginal        oldSidePosition       or    POST  sidesOriginal        sideext          echo  enter

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According to this page   NOTE  The accepted answer works for associative arrays  but it will not work as expected with indexed arrays  explained below   If you want to compare either of them  then use this solution  Also  this function may not works with multidimensional arrays  due to the nature of array diff function    Testing two indexed arrays  which elements are in different order  using  a     b or  a      b fails  for example    lt  php      array  x   y      array  y   x        false    gt    That is because the above means   array 0   gt   x   1   gt   y   vs  array 0   gt   y   1   gt   x     To solve that issue  use    lt  php function array equal  a   b        return            is array  a             amp  amp  is array  b             amp  amp  count  a     count  b             amp  amp  array diff  a   b      array diff  b   a             gt    Comparing array sizes was added  suggested by super ton  as it may improve speed

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Compare them as other values   if  array a     array b        they are the same     You can read about all array operators here  http   php net manual en language operators array php Note for example that     also checks that the types and order of the elements in the arrays are the same

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Short solution that works even with arrays which keys are given in different order   public static function arrays are equal  array1   array2        array multisort  array1       array multisort  array2       return   serialize  array1      serialize  array2

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Try serialize  This will check nested subarrays as well    foo  serialize  array foo    bar  serialize  array bar   if   foo     bar  echo  Foo and bar are equal

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One way   implementing  considered equal  for http   tools ietf org html rfc6902 section-4 6   This way allows associative arrays whose members are ordered differently - e g  they d be considered equal in every language but php        recursive ksort function rksort  a      if   is array  a         return  a        foreach  array keys  a  as  key         a  key    ksort  a  key             SORT STRING seems required  as otherwise      numeric indices  e g   0   aren t sorted    ksort  a  SORT STRING     return  a         Per http   tools ietf org html rfc6902 section-4 6 function considered equal  a1   a2      return json encode rksort  a1       json encode rksort  a2

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Syntax problem on your arrays   array1   array       a    gt   value1        b    gt   value2        c    gt   value3         array2   array       a    gt   value1        b    gt   value2        c    gt   value3         diff   array diff  array1   array2    var dump  diff

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arraysAreEqual     a     b      TRUE if  a and  b have the same key value pairs   arraysAreEqual     a      b      TRUE if  a and  b have the same key value pairs in the same order and of the same types    See Array Operators   EDIT  The inequality operator is    while the non-identity operator is     to match the equality  operator    and the identity operator

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Use php function array diff array1  array2    It will return a the difference between arrays  If its empty then they re equal    example     array1   array       a    gt   value1         b    gt   value2         c    gt   value3        array2   array       a    gt   value1         b    gt   value2         c    gt   value4        diff   array diff array1  array2    var dump  diff       it will print array    0   gt    c     gt   value4       Example 2    array1   array       a    gt   value1         b    gt   value2         c    gt   value3         array2   array       a    gt   value1         b    gt   value2         c    gt   value3         diff   array diff array1  array2    var dump  diff       it will print empty

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if  array diff  a  b     array diff  b  a          Equals    if  array diff  a  b     array diff  b  a          Not Equals     From my pov it s better to use array diff than array intersect because with  checks of this nature the differences returned commonly are less than the similarities  this way the bool conversion is less memory hungry   Edit Note that this solution is for plain arrays and complements the    and     one posted above that is only valid for dictionaries

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Here is the example how to compare to arrays and get what is different between them    array1     1    gt   XXX    second    gt                 a    gt    test    gt   2                 b    gt   test              b    gt    no test               array2                  1    gt   XX                second    gt                     a    gt    test    gt   5    z    gt  5                    b    gt   test                              test                       function compareArrayValues  arrayOne   arrayTwo   amp  diff        reversed   false                        foreach   arrayOne as  key   gt   val                    if   isset  arrayTwo  key                           diff  key     MISSING IN       reversed    FIRST     SECOND                      else if  is array  val   amp  amp   json encode  arrayOne  key       json encode  arrayTwo  key                           compareArrayValues  arrayOne  key    arrayTwo  key    diff  key    reversed                     else if   arrayOne  key       arrayTwo  key                          diff  key     DIFFERENT                                                       diff                diffSecond                compareArrayValues  array1   array2   diff           compareArrayValues  array2   array1   diffSecond  true            print r  diff           print r  diffSecond            print r array merge  diff   diffSecond      Result   Array        0    gt  DIFFERENT      second    gt  Array                        a    gt  Array                                        test    gt  DIFFERENT                      z    gt  MISSING IN FIRST                                    b    gt  MISSING IN SECOND      1    gt  DIFFERENT      2    gt  MISSING IN FIRST

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If you want to check non associative arrays  here is the solution    a     blog    company     b     company    blog      count array unique array merge  a   b        count  a      Equals     Not Equals      Equals

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array diff     Computes the difference of arrays http   php net manual en function array-diff php  array array diff   array  array1   array  array2    array           Compares array1 against one or more other arrays and returns the values in array1 that are not present in any of the other arrays

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function compareIsEqualArray array  array1 array  array  bool       return  array diff  array1  array2       amp  amp  array diff  array2  array1

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Another method for checking equality regardless of value order works by using http   php net manual en function array-intersect php  like so    array1   array 2 5 3    array2   array 5 2 3   if  array1     array intersect  array1   array2   amp  amp   array2     array intersect  array2   array1         echo  Equal     else       echo  Not equal       Here s a version that works also with multidimensional arrays using http   php net manual en function array-uintersect php    array1   array      array 5  2       array 3  6       array 2  9  4      array2   array      array 3  6       array 2  9  4       array 5  2      if  array1     array uintersect  array1   array2   compare    amp  amp   array2     array uintersect  array2   array1   compare          echo  Equal     else       echo  Not equal      function compare  v1   v2        if   v1    v2            return 0            if   v1  gt   v2  return 1      return -1

User · Answer

will not work because it s a syntax error   The correct way is      not three  equal to  symbols

[php] PHP - Check if two arrays are equal

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