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<?php $val = new DateTime(); var_dump(json_encode($val)); var_dump(json_last_error()); var_dump(PHP_VERSION_ID >= 50500 ? json_last_error_msg() : NULL);
Output for git.master
string(86) "{"date":"2014-04-09 23:02:51.003546","timezone_type":3,"timezone":"Europe\/Amsterdam"}" int(0) string(8) "No error"
Output for git.master_jit
string(86) "{"date":"2014-04-09 23:02:51.003932","timezone_type":3,"timezone":"Europe\/Amsterdam"}" int(0) string(8) "No error"
Output for rfc.property-hooks
string(86) "{"date":"2014-04-09 23:02:51.003577","timezone_type":3,"timezone":"Europe\/Amsterdam"}" int(0) string(8) "No error"

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