What potential issue arises when using foreach with an array in PHP?

When using foreach with an array in PHP, a potential issue that may arise is modifying the array within the loop. This can lead to unexpected behavior or errors because foreach operates on a copy of the array rather than the actual array itself. To solve this issue, you can use a reference variable in the foreach loop declaration, which allows you to directly modify the original array. 

$array = [1, 2, 3, 4, 5];
foreach ($array as &$value) {
    $value *= 2;
}
unset($value); // unset the reference variable
print_r($array);

Keywords

foreach array PHP key value

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