In Symfony 3.3, cookies include the new "max-age" attribute and they can be created via PHP strings thanks to a new named constructor.
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Symfony 3.3 improves the formatting of the JSON and Markdown descriptors for console commands.
In addition to some large new features, Symfony 3.3 will also contain minor tweaks to make your work a bit easier.
In Symfony 3.3, the Configuration panel of the Symfony Profiler will show more information about PHP and Symfony.
How to solve the "Undefined class constant PARSE_CONSTANT" error displayed by PHPUnit when running tests in Symfony 3.2 applications.
In Symfony 3.3, the DomCrawler component added support for the formaction and formmethod attributes that form buttons can define to override the original action and method defined by the form.
The Symfony Security component provides out-of-the-box support for several authentication mechanisms, such as form logins and HTTP. In Symfony 3.3 we added a new mechanism based on JSON.