PHP5.3

PHP5.4

PHP5.5

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

PHP5.6

PHP7