You can reference values of an array to the values of another array,
however if you change the array by reassigning it, the reference will no longer apply, for example:
<?php
$ref = [1,2,3];
$c = count($ref);
$foo = ['A'];
for($i=0;$i<$c;$i++)
$foo[] =& $ref[$i];
print_r($foo);
print_r($ref);
$ref = [4,5,6];
print_r($foo);
print_r($ref);
?>
Will output:
Array
(
[0] => A
[1] => 1
[2] => 2
[3] => 3
)
Array
(
[0] => 1
[1] => 2
[2] => 3
)
Array
(
[0] => A
[1] => 1
[2] => 2
[3] => 3
)
Array
(
[0] => 4
[1] => 5
[2] => 6
)
Therefore if you want the values to still reference you must set the array values individually to not reassign the array:
<?php
$ref = [1,2,3];
$c = count($ref);
$foo = ['A'];
for($i=0;$i<$c;$i++)
$foo[] =& $ref[$i];
print_r($foo);
print_r($ref);
$bar = [4,5,6];
foreach($bar as $i => $value)
$ref[$i] = $value;
print_r($foo);
print_r($ref);
?>
Results:
Array
(
[0] => A
[1] => 1
[2] => 2
[3] => 3
)
Array
(
[0] => 1
[1] => 2
[2] => 3
)
Array
(
[0] => A
[1] => 4
[2] => 5
[3] => 6
)
Array
(
[0] => 4
[1] => 5
[2] => 6
)
