<?php $a = 'foo'; $b = & $a; function evilExtractor(array $data) { extract($data, EXTR_REFS); $values = get_defined_vars(); foreach ($values as $key => & $value) { if (is_string($value)) { $value .= ' - modified'; } } } evilExtractor(get_defined_vars()); var_dump($a, $b);
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