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Discussion: This type of explanation of using foreach ($arr as &$value) in foreach in PHP_PHP Tutorial
- WBOYOriginal
- 2016-07-21 15:03:57925browse
Since PHP 5, you can easily modify the elements of an array by preceding $value with &. This method assigns by reference rather than copying a value.
Copy code The code is as follows:
$arr = array(1, 2, 3, 4);
foreach ($arr as &$value) {
$value = $value * 2;
}
// $arr is now array(2, 4, 6, 8)
?>
This method is only available when the array being traversed can be referenced (for example, it is a variable).
Copy code The code is as follows:
foreach (array(1, 2, 3, 4) as &$value) {
$value = $value * 2;
}
?>
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