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<?php $arr = array('recursive'); $arr[] = & $arr; var_dump(json_encode($arr)); var_dump(json_last_error()); var_dump(PHP_VERSION_ID >= 50500 ? json_last_error_msg() : NULL);
Output for git.master, git.master_jit, rfc.property-hooks
bool(false) int(6) string(18) "Recursion detected"

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