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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