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<?php
$a = array(1,2,3);
foreach ($a as &$v){
 $v++;
}
unset($v);
print_r($a);
foreach ($a as $v){
 echo $v." ";
}
echo "\n";
print_r($a);

Success #stdin #stdout 0.01s 20568KB

stdin

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Standard input is empty

stdout

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Array
(
    [0] => 2
    [1] => 3
    [2] => 4
)
2 3 4 
Array
(
    [0] => 2
    [1] => 3
    [2] => 4
)

https://ideone.com/3sry7c

language:

PHP (php 7.3.5)

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