新增Finally关键字：http://www.laruence.com/2012/08/16/2709.html
新赠yield关键字，可以在方法中返回多个值所组成的数组
<?php function gen_one_to_three() { for ($i = 1; $i <= 3; $i++) { // Note that $i is preserved between yields. yield $i; } } $generator = gen_one_to_three(); foreach ($generator as $value) { echo "$value\n"; } ?>
增加了opcache扩展
原文：http://www.cnblogs.com/linux-centos/p/5413515.html