What is this? This is a QR Code: a machine-readable image-based code consisting of black and white squares. QR Codes are typically used for storing URLs and other information for reading by a smart devices like smart phones.
When scanned by an appropriate app on your mobile device, you are redirected to the embedded URL of this page. View this page with one device (desktop or another mobile device), and then scan the
QR Code with your mobile device. This makes it quicker and easier to browse a page discovered on one device on your mobile device without manually entering the URL in the mobile device browser address bar.
⚬ If you are using an Android phone, you can find a QR Code reading app at Google Play on your device.
⚬ If you are using an iOS device (iPhone, iPad, etc.), you can find a QR Code reading app at the Apple iTunes App Store on your device.
⚬ If you are using a Windows phone, you can find a QR Code reading app at the Microsoft Store on your device.
PHP Manual [Migrating from PHP 5.5.x to PHP 5.6.x]
Most improvements in PHP 5.6.x have no impact on existing code. There are
a few incompatibilities
and new features that should
be considered, and code should be tested before switching PHP
versions in production environments.