Models, Views, and Controllers (MVC) patterns are used by CodeIgniter to organized the files. This helps us to maintain the data, the presentation, and flow through the application. To make things more clear we can understand with their basic definition:...

The setAlign() function is an inbuilt function in PHP | Spreadsheet_Excel_Writer which is used to set cell alignment of the spreadsheet....

The DirectoryIterator::current() function is an inbuilt function in PHP which is used to return the current DirectoryIterator item....

The DirectoryIterator::isFile() function is an inbuilt function in PHP which is used to check the current DirectoryIterator item is a regular file or not....

The CachingIterator::getCache() function is an inbuilt function in PHP which is used to retrieve the contents of the cache....

The DirectoryIterator::isDir() function is an inbuilt function in PHP which is used to check the current DirectoryIterator item is a directory or not....

The ArrayIterator::rewind() function is an inbuilt function in PHP which is used to rewind the array back to the start....

The DirectoryIterator::getExtension() function is an inbuilt function in PHP which is used to get the file extension....

The DirectoryIterator::next() function is an inbuilt function in PHP which is used to move forward to the next DirectoryIterator item....

The CachingIterator::hasNext() function is an inbuilt function in PHP that is used to iterate the next element in the iterator. CachingIterator class is to cache the elements of an underlying iterator to improve performance when iterating over the same data multiple times....

The ArrayIterator::offsetExists() function is an inbuilt function in PHP which is used to check the existence of offset at the given index....

The DirectoryIterator::seek() function is an inbuilt function in PHP which is used to seek the DirectoryIterator item to the given position....