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http://php.net/manual/zh/migration53.new-features.php
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http://php.net/manual/zh/migration55.new-features.php
http://php.net/manual/zh/migration56.new-features.php
http://blog.csdn.net/black_ox/article/details/21163193
http://www.chinaz.com/news/2014/1103/372786.shtml