foreach ($string as $key => $val) What is this usage? How to solve it

foreach ($string as $key + $val) What is this usage?
if (Is_array ($string)) {//If it is an array then loop executes this function
foreach ($string as $key = = $val) {
$string [$key] = Daddslashes ($val, $force);
}

Look at Discuz's Code analysis article, see this in the Daddslashes function, iterate over the array, assign a value to the key? But if I write like this, I always give an error, why?

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------Solution--------------------
You must have read the article reproduced.

> In fact, it is an estimate of the background to treat it as HTML special characters

foreach ($string as $key = > $val)
foreach ($string as $key = > $val)

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