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<?php
$a=["a","b","c"];
$b=$a;

$b[]="d";
print_r($a);                    // will not changed
print_r($b);
echo "-----------\n";

$b[1]='e';
print_r($a);                    // will not changed
print_r($b);

$will_be_displayed=<<<EOS
Array
(
    [0] => a
    [1] => b
    [2] => c
)
Array
(
    [0] => a
    [1] => b
    [2] => c
    [3] => d
)
-----------
Array
(
    [0] => a
    [1] => b
    [2] => c
)
Array
(
    [0] => a
    [1] => e
    [2] => c
    [3] => d
)
EOS;