PHP中是否有内置函数允许我选择不是我指定的数组键

Question

Consider an array

$my_array("key1"=>"value1", "key2"=>"value2", "key3"=>"value3")

Does PHP have a function in which I can pass in key1 and it returns key2 and key3. Assuming key1 is always the same but key2 and key3 can change from time to time.

$my_array("key1"=>"value1", "key2"=>"value2", "key3"=>"value3");
$result = the_function_i_want("key1");
print_r($result);

Expected Output

 Array
    (
        [key2] => value2
        [key3] => value3
    )

Answer 1

If you wish to compare the keys you could use the following;

$array1 = array("a" => "green", "red", "blue", "red");
$array2 = array("a" => "green");

function key_diff($array1, $array2){

    foreach ($array2 as $sKey => $value) {
        if(isset( $array1[$sKey] ) ) unset($array1[$sKey]);
    }
    return $array1;
}

var_dump(key_diff($array1, $array2));
exit;

If you wish to compare the values you can use array_diff() as Taken from PHP Manual

<?php
$array1 = array("a" => "green", "red", "blue", "red");
$array2 = array("b" => "green", "yellow", "red");
$result = array_diff($array1, $array2);

print_r($result);
?>

Multiple occurrences in $array1 are all treated the same way. This will output :

Array
(
    [1] => blue
)