* Highlight VLOOKUP bug with a new test
* Remove useless statements + fix VLOOKUP bug
Please not that we have still inconsistencies in Excel (See LOOKUP and
VLOOKUP.php test files)
* Base strtolower on our StringHelper in LookupRef
* Document calculation caching; and how to disable it and how to flush the cache
* Quoted text for string values beginning with `=`, so that they are still treated as strings and not as formulae
* Warning about assigning cells to variables
* Further warning about assigning cells to variables
* getCell() with a second argument
* Added String Value Binder, and a Reader example demonstrating how to use it
* Ensure value is a string before binding
* Sample file for String Value Binder
* PHPCS moaning about order or use statements
* Order of annotations, that PHPStorm determined, isn't what phpcs says it should be
* Extract character set, so we can convert to UTF-8 if required
* Set column width and row height when defined on tr/td
* Parse align and valign on td
* Specify number format of cell via html attribute
* Formatting of b, strong, i and em tags
* Inserting image in cell when using img tag in html
* Add applying inline styles: border, fonts, alignment, dimensions
* Add tests for applying inline styles
In case we generate Spreadsheet from html file and the code
in file have text color in css "color:#FF00FF" it will showing
as black color because it will render like rgb content with } "FF00FF}"
So, we fix it by adding missing bracket "{".
Closes#831
Using an operator is significantly faster than calling the max function.
As this method is called more than once per cell the difference adds up.
Closes#824
Removing the duplicate strtoupper call has a meaningful impact on
performance since this method is called at least once per cell.
`Worksheet::getCells` currently calls `strtoupper` twice. `strtoupper`
is kind of expensive and this method is called at least once for every
cell in the spreadsheet. By removing the unnecessary second call the
runtime decreases by 18% when importing a ~100K cell spreadsheet.
Closes#825
For large XLSX files `Reader/Xlsx::readColumnsAndRowsAttributes()` performs
a lot of calls to `$this->getReadFilter()` and `$this->getReadFilter()->readCell()`
as `readCell()` is called twice for each (possibbly filled) cell.
By ignoring calls to the DefaultReadFilter implementation (which always returns true),
using no custom read filter will not incur any runtime penalty.
The runtime penaltiy when using a custom read filter is reduced by a third by
caching the read filter into a variable instead of using the getter method.
Fixes issue #772.
Fräntz Miccoli