Active support for PHP 5.6 ended on December 31, 2016. PHP 5.6 will receive only critical security fixes until its End of Life on December 31, 2018. Developers still on PHP 5 are urged to upgrade to PHP 7 (ideally 7.1) as soon as possible. A list of popular frameworks and tools dropping PHP 5 support in 2017 is provided, including PHPUnit 6, Laravel 5.5, Symfony 4.0, and others. The post also emphasizes making PHP version upgrades a routine operational practice rather than a one-off project.
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The PHP release processWhat this means for youWhat you should doFrameworks, libraries, and toolsSort: