> Can you give an example of an internal stack frame?
A stack frame that was created by a PHP internal function instead of by
userland code, i.e. one without a file in the frame.
Related to https://github.com/php/php-src/pull/5820#pullrequestreview-452080212
```
php > array_map(fn() => $GLOBALS['x'] = StackFrame::getTrace()[0], [2]);
php > var_export($x);
StackFrame::__set_state(array(
'file' => NULL,
'line' => NULL,
'function' => '{closure}',
'class' => NULL,
'type' => NULL,
'object' => NULL,
'object_class' => NULL,
'closure' => NULL,
'args' =>
array (
0 => 2,
),
))
```
Regards,
- Tyson
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