两个具有相同值的数组键

Question

Just wondering how I can easily have two array keys with the same associative value. My current code is:

$arraytest = array(
        'test1', 'test2' => 1,
        'test3', 'test4' => 2,
)

I want the array to work so the following code returns:

$arraytest['test1'] returns 1
$arraytest['test2'] returns 1

etc

thanks for your help, m

Answer 1

you can associate the reference of one variable to two array keys to simulate this situation :

e.g.

$a = 2;

$arraytest = array (
  'test1' => &$a,
  'test2' => &$a
);

This way, as 'test1' and 'test2' point to $a in memory you will always have the value of the "real" $a using 'test1' and 'test2' of the array. However keep in mind using references in arrays should be avoided since this can lead to unexpected program behaviors:

from php.net documentation

"Note, however, that references inside arrays are potentially dangerous. Doing a normal (not by reference) assignment with a reference on the right side does not turn the left side into a reference, but references inside arrays are preserved in these normal assignments. This also applies to function calls where the array is passed by value."

More details here => What References Do (php.net)