Differences between php versions
1. Comparison of differences between PHP 5.2, 5.3, 5.4, 5.5, 5.6 versions and detailed explanation of new features
PHP5.2 以前：autoload, PDO 和 MySQLi, 类型约束 PHP5.2：JSON 支持 PHP5.3：弃用的功能，匿名函数，新增魔术方法，命名空间，后期静态绑定，Heredoc 和 Nowdoc, const, 三元运算符，Phar PHP5.4：Short Open Tag, 数组简写形式，Traits, 内置 Web 服务器，细节修改 PHP5.5：yield, list() 用于 foreach, 细节修改 PHP5.6: 常量增强，可变函数参数，命名空间增强
2. PHP7 New features
./bin/php -v #查看PHP版本 ./bin/php -m #查看安装的模块
1. Variable type
function test(int $a,string $b,array $c):int{
}2. Error exception
try/catch
3. Using stack memory with zval
节约了内存分配 php5 zval*val;make_std_zval(val)； php7 zval val;
Recommended tutorial: PHP video tutorial
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