Dynamically add data to the array during foreach loop, foreach array_PHP tutorial

Dynamicly add data to the array during the foreach loop, foreach array

Add data (we will give you an example here)

Result:

foreach ($arr as &$v){···}, it is equal to $v=&$arr[$k]
$arr[$k] and $v At the same time, it points to the memory address of $arr[$k]. Even unset($v) only deletes the reference of $v to the memory space and does not delete the reference of $arr[$k] to the memory address, so $arr [$k] is still alive, so $arr naturally remains unchanged, so it should be like this

Result:

There is one more thing to note: &$kWhat is the result

Result:

It means: the key cannot be quoted, there is no such syntax format at all

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