Data Filtering

Filter Classes in SPHPlayground offer simple object oriented interface to filtering and validation.

• Sphp\Filters namespace contains filters that alter the input
• Sphp\Validation namespace contains validators

All SPHPlayground filters implement the Filter interface. Build-in filters focus on filtering arrays and scalar values.

Definition a data filter:

1. All Filter implementations should accept any type of input variable
2. An implementation should never throw an exception or produce PHP errors or PHP warnings for any type of input data
3. Otherwise the implementation of the functionality is totally unrestricted
4. Because of the above rules these filters are NOT necessarily SAFE

Sanitizing filters

These filters sanitize scalar values or an array of scalars. Similar results can be achieved by using PHP's filter extension.

An ArrayFilter filters an array of valiables. It returns filtered values as an array. Individual key -> value pairs are filtered using specified filters like:

• FilterAggregate consists of Filter objects and/or other callables that act as a filter. Individual filters in this aggregate are executed in the order they are inserted into the aggeragate.
• A StringFilter filters input variable as a string.
• A IntegerFilter for integer filtering
• FloatFilter for float filtering

Special filters

SPHPlayground has a couple of special filters.

Filters for development and testing

HtmlIntender indents HTML. It uses Dindent, and thus it will not sanitize or otherwise manipulate your output beyond indentation.

SQLFormatter indents SQL statement strings. It uses Doctrine SqlFormatter. This filter will not sanitize or otherwise manipulate the output beyond indentation.

Special numeric filters

• IntegerToRoman creates roman numerals from variables that can be represented by positive integers.
• Ordinalizer creates english ordinal numers. This should only be used if NumberFormatter is not available.