array_intersect_assoc

(PHP 4 >= 4.3.0, PHP 5, PHP 7)

array_intersect_assoc — Computes the intersection of arrays with additional index check

Descrierea

array_intersect_assoc ( array $array , array ...$arrays ) : array

array_intersect_assoc() returns an array containing all the values of array that are present in all the arguments. Note that the keys are also used in the comparison unlike in array_intersect().

Parametri

array: The array with master values to check.
arrays: Arrays to compare values against.

Valorile întoarse

Returns an associative array containing all the values in array that are present in all of the arguments.

Exemple

Example #1 array_intersect_assoc() example


<?php
$array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
$array2 = array("a" => "green", "b" => "yellow", "blue", "red");
$result_array = array_intersect_assoc($array1, $array2);
print_r($result_array);
?>

Exemplul de mai sus va afișa:

Array
(
    [a] => green
)

In our example you see that only the pair "a" => "green" is present in both arrays and thus is returned. The value "red" is not returned because in $array1 its key is 0 while the key of "red" in $array2 is 1, and the key "b" is not returned because its values are different in each array.

The two values from the key => value pairs are considered equal only if (string) $elem1 === (string) $elem2 . In other words a strict type check is executed so the string representation must be the same.

A se vedea și

array_intersect() - Computes the intersection of arrays
array_uintersect_assoc() - Computes the intersection of arrays with additional index check, compares data by a callback function
array_intersect_uassoc() - Computes the intersection of arrays with additional index check, compares indexes by a callback function
array_uintersect_uassoc() - Computes the intersection of arrays with additional index check, compares data and indexes by separate callback functions
array_diff() - Calculează diferența dintre tablouri
array_diff_assoc() - Computes the difference of arrays with additional index check

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User Contributed Notes 4 notes

down

Whitend ¶

12 years ago


One of the ways to get intersection of two arrays is as follows:

<?php
function arrayIntersect( $primary_array, $secondary_array ) {
    
    if ( !is_array( $primary_array ) || !is_array( $secondary_array ) ) {
        return false;
    }
    
    if ( !empty( $primary_array ) ) {
        
        foreach( $primary_array as $key => $value ) {
            
            if ( !isset( $secondary_array[$key] ) ) {
                unset( $primary_array[$key] );
            } else {
                if ( serialize( $secondary_array[$key] ) != serialize( $value ) ) {
                    unset( $primary_array[$key] );
                }
            }
            
        }
        
        return $primary_array;
        
    } else {
        return array();
    }
    
} 
?>

It would pay attention to both keys and values even if values would be arrays as well. One important note is that if value of $primary_array is yet another array, its order of key & value pairs becomes important for matching.

down

vandor at progressive dot hu ¶

20 years ago


# ket tomb kulcs alapu metszetet szamitja ki, az erteken is ellenorzest vegez
#
# calculating (key base) intersection of arrays (value are checked)
# use: $result_array = array_intersect_assoc($a1, $a2, $a3,..);
#
##
# original code by [jochem at iamjochem dawt com] : array_diff_keys()

<?php
function array_intersect_assoc() {

    $args = func_get_args();
    $res = $args[0];

    for ($i=1;$i<count($args);$i++) {
        if (!is_array($args[$i])) {continue;}

        foreach ($res as $key => $data) {
            if ( (!array_key_exists($key, $args[$i])) || ( (isset($args[$i][$key])) && ($args[$i][$key] !== $res[$key]) ) ) {
                unset($res[$key]);
            }
        }
    }

    return $res;
}

?>

<?php
$array1 = array("a"=>"green", "b"=>"brown", "c"=>"blue", "red");
$array2 = array("a"=>"green", "b"=>"yellow", "c"=>"yellow", "red");
$a = array('a'=>'green', 'b'=>'brown', 'c'=>'yellow');
$b = array('a'=>'green', 'b'=>'brown', 'c'=>'yellow', 'e'=>'yellow');

$result_array = array_intersect_assoc($a, $b, $array1, $array2);
?>

$args array will look like:

(
    0 => 
        (
            a => green
            b => brown
            c => yellow
        )

    1 => 
        (
            a => green
            b => brown
            c => yellow
            e => yellow
        )

    2 => 
        (
            a => green
            b => brown
            c => blue
            0 => red
        )

    3 => 
        (
            a => green
            b => yellow
            c => yellow
            0 => red
        )

)

$result_array will look like:

(
    a => green
)

down

-5

StR: str at strgt dot cjb dot net ¶

19 years ago


To find the keys that are in 2 arrays, without caring of the values:

This is a function i needed, and it also returns the values of the first array

<?php
function array_key_intersect(&$a, &$b) {
  $array = array();
  while (list($key,$value) = each($a)) {
    if (isset($b[$key]))
      $array[$key] = $value;
  }
  return $array;
}
?>

down

-7

Jim Yaghi ¶

7 years ago


Remember, null values will be interpreted as, "key does not exist." eg,

$a = ['apples' => 1, 'oranges' => 2, 'turtles' => null, 'bananas'=>4];
$b = ['apples'=>10, 'turtles' => 11, 'eggs'=>12];
$c = array_intersect_assoc($b,$a);

You might have expected $c to contain:

['oranges' => 10, 'turtles' => 11]

In fact, 'turtles' has a null value in the $a array, therefore the $c array contains only:

['oranges' => 10]

Something to keep in mind if using array_intersect_assoc to filter valid entries, eg in a mySQL insertion pre-processing or nerdy API that doesn't like extra params.

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