array_intersect_assoc() returns an array
containing all the values of array1
that are present in all the arguments. Note that the keys are used in
the comparison unlike in array_intersect().
Parameters
array1
The array with master values to check.
array2
An array to compare values against.
array
A variable list of arrays to compare.
Return Values
Returns an associative array containing all the values in
array1
that are present in all of the arguments.
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.
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.