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array_intersect_assoc

(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)

array_intersect_assocCalcola l'intersezione degli array con un ulteriore controllo sugli indici

Descrizione

array_intersect_assoc(array $array1, array $array2, array $ ... = ?): array

array_intersect_assoc() restituisce un array contenente tutti i valori di array1 che siano presenti in tutti gli array passati come argomento. Si noti che le chiavi sono utilizzate nel confronto, diversamente da array_intersect().

Example #1 esempio di array_intersect_assoc()

<?php
$array1
= array("a" => "verde", "b" => "marrone", "c" => "blu", "rosso");
$array2 = array("a" => "verde", "giallo", "rosso");
$result_array = array_intersect_assoc($array1, $array2);
?>

$result_array sarà:

Array
(
    [a] => verde
)

Nell'esempio si vede che solo la coppia "a" => "verde" è presente in entrambi gli array e quindi viene restituita. Il valore "rosso" non viene restituito perché in $array1 la sua chiave è 0 mentre la chiave di "rosso" in $array2 è 1.

I due valori delle coppie chiave => valore sono considerati uguali solo se (string) $elem1 === (string) $elem2 . In altre parole viene eseguito un controllo stringente che si accerta che le rappresentazioni sotto forma di stringa siano uguali.

Vedere anche array_intersect(), array_uintersect_assoc(), array_intersect_uassoc(), array_uintersect_uassoc(), array_diff() e array_diff_assoc().

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User Contributed Notes 4 notes

up
6
Whitend
11 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.
up
4
vandor at progressive dot hu
19 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
)
up
-6
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.
up
-7
StR: str at strgt dot cjb dot net
18 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;
}
?>
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