Note: Unless the array is referenced, foreach operates on a copy of the specified array, not the array itself. So the array pointers are not changed by the each () structure, and the changes to the returned array cells do not affect the original array.
1. Since php5, foreach may also traverse the properties of an object.
2. Since php5, foreach can easily modify the array's cells by adding & before $value, which assigns a value instead of copying a value.
Copy the Code code as follows:
$arr = Array (1, 2, 3, 4);
foreach ($arr as & $value) {
$value = $value * 2;
}
?>
Output: $arr =array (2, 4, 6, 8)
Note: foreach does not support the ability to suppress error messages with "@".
The above describes the Fourleafclover php for and foreach differential analysis, including the fourleafclover aspects of the content, I hope that the PHP tutorial interested in a friend helpful.
