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<?php var_dump(preg_match('/\A\w/z', 'あ'));
Output for 4.3.11 - 7.2.0
Warning: preg_match(): Unknown modifier 'z' in /in/dR3fV on line 2 bool(false)
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier 'z' in /in/dR3fV on line 2 bool(false)