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<?php function foo($m) { return md5($m[1]); } var_dump(preg_replace_callback('/A([^B]+)B/','foo', "foo ApasswordB bar \xef\xb7\x90"));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(44) "foo 5f4dcc3b5aa765d61d8327deb882cf99 bar ﷐"