Are PHP variables declared inside a foreach loop destroyed and re-created at each iteration?

Question

If I declare a variable inside a foreach loop, such as:

foreach($myArray as $myData) {
    $myVariable = \'x\';
}

Does PHP destroy it, and

Answer 1

The problem is $myVariable is not truly local to foreach only. So it can clobber a global variable under the same name.

A way around that is make your foreach an inline anonymous function.

E.g.

$myforeach=function(&$myArray){ // pass by ref only if modifying it
  foreach($myArray as $myData) {
    $myVariable = 'x';
  }
};
$myforeach($myArray);  // execute anonymous.

This way you guarantee it will not step on other globals.