The following code, which returns back a flattened array of sorts into the $results array, in newer versions of PHP raises the error "PHP Fatal error: Call-time pass-by-reference has been removed":
<?php
$results = array();
function example_function ($item, $key, &$arr_values)
{
$arr_values[$key] = $item;
}
array_walk_recursive($data, 'example_function', &$results);
print_r($results);
?>
This can be fixed using an anonymous function:
<?php
$results = array();
array_walk_recursive($data, function ($item, $key) use (&$results){$results[$key] = $item;});
print_r($results);
?>
