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<?php $a = 'foo'; $b = & $a; function evilExtractor(array $data) { extract($data); foreach (get_defined_vars() as $key => & $value) { if (is_string($value)) { $value .= ' - modified'; } } } evilExtractor(get_defined_vars()); var_dump($a, $b);
Output for git.master, git.master_jit, rfc.property-hooks
string(3) "foo" string(3) "foo"

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