While upload images from mobile devices like Android/ iPhone with mobile camera, images will be shown in wrong orientation. To avoid this, you need to know image original orientation. “exif_read_data” function return image Orientation information.

If you need to get array unique values from array use “array_unique” function. But while dealing with multi-dimensional associate array, this “array_unique” will not work. Use bellow function to get unique values from associate array.

The round() function rounds a floating-point number. To round a number UP to the nearest integer. To round a number DOWN to the nearest integer.

PHPExcel library to provide an “Export to Excel” function in a website. So that the user can export the data into an Excel 2007/2013 file. We can draw the images inside the excel column. PHP Excel library provides this feature. It's easy to use.

Two of the many comparison operators used by PHP are '==' (i.e. equal) and '===' (i.e. identical). The difference between the two is that '==' should be used to check if the values of the two operands are equal or not. On the other hand, '===' checks the values as well as the type of operands.