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array_diff_assoc

(PHP 4 >= 4.3.0, PHP 5)

array_diff_assocComputa a diferença entre arrays com checagem adicional de índice

Descrição

array array_diff_assoc ( array $array1 , array $array2 [, array $... ] )

Compara array1 com array2 e retorna a diferença. Ao contrário de array_diff(), as chaves dos arrays são usadas na comparação.

Parâmetros

array1

O array a comparar.

array2

O array a ser comparado.

...

Mais arrays a serem comparados.

Valor Retornado

Retorna um array contendo todos os valores do array1 que não estão presentes em qualquer dos outros arrays.

Exemplos

Exemplo #1 Exemplo de array_diff_assoc()

Neste exemplo você vê que o par "a" => "verde" está presente em ambos os arrays e assim ele não está na saída da função. Ao contrário disso, o par 0 => "vermelho" está na saída porque no segundo argumento "vermelho" tem a chave 1.

<?php
$array1 
= array("a" => "verde""b" => "marrom""c" => "azul""vermelho");
$array2 = array("a" => "verde""amarelo""vermelho");
$result array_diff_assoc($array1$array2);
print_r($result);
?>

O exemplo acima irá imprimir:

Array
(
    [b] => marrom
    [c] => azul
    [0] => vermelho
)

Exemplo #2 Exemplo de array_diff_assoc()

Dois valores dos pares chave => valor são considerados iguais somente se (string) $elem1 === (string) $elem2 . Em outras palavras, uma checagem estrita de string é feita para que representações de string sejam as mesmas.

<?php
$array1 
= array(012);
$array2 = array("00""01""2");
$result array_diff_assoc($array1$array2);
print_r($result);
?>

O exemplo acima irá imprimir:

Array
(
    [0] => 0
    [1] => 1
    )

Notas

Nota: Esta função checa somente uma dimensão de um array n-dimensional. É claro que você pode checar dimensões mais profundas usando, por exemplo, array_diff_assoc($array1[0], $array2[0]);.

Veja Também

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User Contributed Notes 13 notes

up
9
Michael Richey
1 year ago
If you're looking for a true array_diff_assoc, comparing arrays to determine the difference between two, finding missing values from both, you can use this along with array_merge.

$a = array('a'=>1,'b'=>2,'c'=>3);
$b = array('a'=>1,'b'=>2,'d'=>4);
print_r(array_diff_assoc($a,$b));
// returns:
array
(
    [c] => 3
)

print_r(array_diff_assoc($b,$a));
// returns
array
(
    [d] => 4
)

print_r(array_merge(array_diff_assoc($a,$b),array_diff_assoc($b,$a)));
// returns
array
(
    [c] => 3
    [d] => 4
)
up
6
Alexander Podgorny
8 years ago
NOTE: the diff_array also removes all the duplicate values that match to the values in the second array:

<?php
    $array1
= array("a","b","c","a","a");
   
$array2 = array("a");

   
$diff = array_diff($array1,$array2);

   
// yields: array("b","c") the duplicate "a" values are removed
?>
up
4
chinello at gmail dot com
7 years ago
The following will recursively do an array_diff_assoc, which will calculate differences on a multi-dimensional level.  This not display any notices if a key don't exist and if error_reporting is set to E_ALL:

<?php
function array_diff_assoc_recursive($array1, $array2)
{
    foreach(
$array1 as $key => $value)
    {
        if(
is_array($value))
        {
              if(!isset(
$array2[$key]))
              {
                 
$difference[$key] = $value;
              }
              elseif(!
is_array($array2[$key]))
              {
                 
$difference[$key] = $value;
              }
              else
              {
                 
$new_diff = array_diff_assoc_recursive($value, $array2[$key]);
                  if(
$new_diff != FALSE)
                  {
                       
$difference[$key] = $new_diff;
                  }
              }
          }
          elseif(!isset(
$array2[$key]) || $array2[$key] != $value)
          {
             
$difference[$key] = $value;
          }
    }
    return !isset(
$difference) ? 0 : $difference;
}
?>

[NOTE BY danbrown AT php DOT net: This is a combination of efforts from previous notes deleted.  Contributors included (Michael Johnson), (jochem AT iamjochem DAWT com), (sc1n AT yahoo DOT com), and (anders DOT carlsson AT mds DOT mdh DOT se).]
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6
Giosh
1 year ago
The array_diff_assoc_array from "chinello at gmail dot com" (and others) will not work for arrays with null values. That's because !isset is true when an array key doesn't exists or is set to null.

(sorry for the changed indent-style)
<?php
function array_diff_assoc_recursive($array1, $array2) {
   
$difference=array();
    foreach(
$array1 as $key => $value) {
        if(
is_array($value) ) {
            if( !isset(
$array2[$key]) || !is_array($array2[$key]) ) {
               
$difference[$key] = $value;
            } else {
               
$new_diff = array_diff_assoc_recursive($value, $array2[$key]);
                if( !empty(
$new_diff) )
                   
$difference[$key] = $new_diff;
            }
        } else if( !
array_key_exists($key,$array2) || $array2[$key] !== $value ) {
           
$difference[$key] = $value;
        }
    }
    return
$difference;
}
?>

And here an example (note index 'b' in the output):
<?php
$a1
=array( 'a' => 0, 'b' => null, 'c' => array( 'd' => null ) );
$a2=array( 'a' => 0, 'b' => null );

var_dump( array_diff_assoc_recursive( $a1, $a2 ) );
var_dump( chinello_array_diff_assoc_recursive( $a1, $a2 ) );
?>
array(1) {
  ["c"]=>
  array(1) {
    ["d"]=>
    NULL
  }
}

array(2) {
  ["b"]=>
  NULL
  ["c"]=>
  array(1) {
    ["d"]=>
    NULL
  }
}
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3
benjamin at moonfactory dot co dot jp
9 years ago
Hi all,
For php versions < 4.3...

<?php
/**
* array_diff_assoc for version < 4.3
**/
if (!function_exists('array_diff_assoc'))
{
    function
array_diff_assoc($a1, $a2)
    {
        foreach(
$a1 as $key => $value)
        {
            if(isset(
$a2[$key]))
            {
                if((string)
$value !== (string) $a2[$key])
                {
                    
$r[$key] = $value;
                }
            }else
            {
               
$r[$key] = $value;
            }
        }
        return
$r ;
    }
}

?>
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3
carl at thep dot lu dot se
11 years ago
To unset elements in an array if you know the keys but not the values, you can do:

<?php
$a
= array("foo", "bar", "baz", "quux");
$b = array(1, 3); // Elements to get rid of

foreach($b as $e)
  unset(
$a[$e]);
?>

Of course this makes most sense if $b has many elements or is dynamically generated.
up
1
news_yodpeirs at thoftware dot de
3 years ago
A quite simple (yet not very efficient) way to compare the first level of arrays which have values that are not strings:
array_map('unserialize',array_diff_assoc(array_map('serialize',$arr1),array_map('serialize',$arr2)))
Might be useful for debugging (that's what I use it for).
up
1
contact at pascalopitz dot com
7 years ago
The direction of the arguments does actually make a difference:

<?php
$a
= array(
   
'x' => 'x',
   
'y' => 'y',
   
'z' => 'z',
   
't' => 't',
);

$b = array(
   
'x' => 'x',
   
'y' => 'y',
   
'z' => 'z',
   
't' => 't',
   
'g' => 'g',
);

print_r(array_diff_assoc($a, $b));
print_r(array_diff_assoc($b, $a));
?>

echoes:

Array
(
)
Array
(
    [g] => g
)
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1
cedric at daneel dot net
7 years ago
To diff between n-dimensional array, juste use this :

<?php
function array_diff_values($tab1, $tab2)
    {
   
$result = array();
    foreach(
$tab1 as $values) if(! in_array($values, $tab2)) $result[] = $values;
    return
$result;
    }
?>
up
0
shadow_games at abv dot bg
2 months ago
there is a functiont that i searched long enough now i have created it so someone else to find it if he need it ;]
<?php
   
function compare_two_object_recursive($object_1, $object_2, $object_1_Identifier = false, $object_2_Identifier = false){
       
$object1 = (array)$object_1;
       
$object2 = (array)$object_2;
       
$object3 = array();

       
$o1i = $object_1_Identifier ? $object_1_Identifier : 1;
       
$o2i = $object_2_Identifier ? $object_2_Identifier : 2;

        foreach(
$object1 as $key => $value){
            if(
is_object($object1[$key])){
               
$object1[$key] = (array)$object1[$key];
               
$object2[$key] = (array)$object2[$key];
               
$object3[$key] = (object)compare_two_object_recursive($object1[$key], $object2[$key], $o1i, $o2i);
            }elseif(
is_array($object1[$key])){
               
$object3[$key] = compare_two_object_recursive($object1[$key], $object2[$key], $o1i, $o2i);
            }else{
                if(
$object1[$key] == $object2[$key]){
                   
$object3[$key]['comparison_status'] = "SAME";
                }else{
                   
$object3[$key]['comparison_status'] = "NOT THE SAME";
                   
$object3[$key][$o1i] = $object1[$key];
                   
$object3[$key][$o2i] = $object2[$key];
                }
            }
        }
        return
$object3;
    }
?>
up
0
dev5er6 at gmail dot com
4 months ago
Works more like the original function:

<?php

function array_diff_assoc_recursive ( )
{
   
$args = func_get_args ( );
   
$diff = array ( );
    foreach (
array_shift ( $args ) as $key => $val )
    {
        for (
$i = 0, $j = 0, $tmp = array ( $val ) , $count = count ( $args ); $i < $count; $i++ )
            if (
is_array ( $val ) )
                if ( !isset (
$args[$i][$key] ) || !is_array ( $args[$i][$key] ) || empty( $args[$i][$key] ) )
                   
$j++;
                else
                   
$tmp[] = $args[$i][$key];
            elseif ( !
array_key_exists ( $key, $args[$i] ) || $args[$i][$key] !== $val )
               
$j++;
        if (
is_array ( $val ) )
        {
           
$tmp = call_user_func_array ( __FUNCTION__, $tmp );
            if ( ! empty (
$tmp ) ) $diff[$key] = $tmp;
            elseif (
$j == $count ) $diff[$key] = $val;
        }
        elseif (
$j == $count && $count ) $diff[$key] = $val;
    }

    return
$diff;
}

?>
up
0
telefoontoestel at hotmail dot com
6 months ago
an earlier post for recursive array_diff_assoc failed because isset returned false on an array element containing a null value. I updated the code so it compares null values too.

<?php
function array_diff_assoc_recursive($array1, $array2)
{
    foreach(
$array1 as $key => $value)
    {
        if(
is_array($value))
        {
              if(!isset(
$array2[$key]))
              {
                 
$difference[$key] = $value;
              }
              elseif(!
is_array($array2[$key]))
              {
                 
$difference[$key] = $value;
              }
              else
              {
                 
$new_diff = array_diff_assoc_recursive($value, $array2[$key]);
                  if(
$new_diff != FALSE)
                  {
                       
$difference[$key] = $new_diff;
                  }
              }
          }
          elseif(!
array_key_exists($key, $array2) || $array2[$key] != $value)
          {
             
$difference[$key] = $value;
          }
    }
    return !isset(
$difference) ? 0 : $difference;
}
?>
up
0
jrajpu10 at gmail dot com
5 years ago
array_diff_assoc can also be used to find the duplicates in an array

<?php
$arr
= array('1','2','3','4','3','2','5');
$uniques = array_unique($arr);
// array_diff will not work here, array_diff_assoc works as it takes the key // in account.
$dups = array_diff_assoc($arr, $uniques);

print_r($dups);
?>

Note: The index of the $dups is not in strict sequential order as expected by C programmer.
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