Add further new Functions introduced in MS Excel 2013 and 2016 (#608)

 - Fix ISFORMULA() function to work with a cell reference to another worksheet
 - Added calculation engine support for the new functions that were added in MS Excel 2013 and MS Excel 2016
   - Text Functions
     - CONCAT()     Synonym for CONCATENATE()
     - NUMBERVALUE()  Converts text to a number, in a locale-independent way
     - UNICHAR()    Synonym for CHAR() in PHPSpreadsheet, which has always used UTF-8 internally
     - UNIORD()     Synonym for ORD() in PHPSpreadsheet, which has always used UTF-8 internally
     - TEXTJOIN()   Joins together two or more text strings, separated by a delimiter
   - Logical Functions
     - XOR()        Returns a logical Exclusive Or of all arguments
   - Date/Time Functions
     - ISOWEEKNUM()  Returns the ISO 8601 week number of the year for a given date
   - Lookup and Reference Functions
     - FORMULATEXT()  Returns a formula as a string
   - Engineering Functions
     - ERF.PRECISE()   Returns the error function integrated between 0 and a supplied limit
     - ERFC.PRECISE()  Synonym for ERFC
   - Math and Trig Functions
     - SEC()          Returns the secant of an angle
     - SECH()         Returns the hyperbolic secant of an angle
     - CSC()          Returns the cosecant of an angle
     - CSCH()         Returns the hyperbolic cosecant of an angle
     - COT()          Returns the cotangent of an angle
     - COTH()         Returns the hyperbolic cotangent of an angle
     - ACOT()         Returns the cotangent of an angle
     - ACOTH()        Returns the hyperbolic cotangent of an angle
  - Financial Functions
    - PDURATION()    Calculates the number of periods required for an investment to reach a specified value
    - RRI()          Calculates the interest rate required for an investment to grow to a specified future value

Author: Mark Baker

CHANGELOG.md

@@ -12,6 +12,35 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Add excel function EXACT(value1, value2) support - [595](https://github.com/PHPOffice/PhpSpreadsheet/pull/595)
 - Support workbook view attributes for Xlsx format - [#523](https://github.com/PHPOffice/PhpSpreadsheet/issues/523)
 - Read and write hyperlink for drawing image - [#490](https://github.com/PHPOffice/PhpSpreadsheet/pull/490)
+- Fix ISFORMULA() function to work with a cell reference to another worksheet
+- Added calculation engine support for the new functions that were added in MS Excel 2013 and MS Excel 2016
+  - Text Functions
+    - CONCAT()        Synonym for CONCATENATE()
+    - NUMBERVALUE()   Converts text to a number, in a locale-independent way
+    - UNICHAR()       Synonym for CHAR() in PHPSpreadsheet, which has always used UTF-8 internally
+    - UNIORD()        Synonym for ORD() in PHPSpreadsheet, which has always used UTF-8 internally
+    - TEXTJOIN()      Joins together two or more text strings, separated by a delimiter
+  - Logical Functions
+    - XOR()           Returns a logical Exclusive Or of all arguments
+  - Date/Time Functions
+    - ISOWEEKNUM()    Returns the ISO 8601 week number of the year for a given date
+  - Lookup and Reference Functions
+    - FORMULATEXT()   Returns a formula as a string
+  - Financial Functions
+    - PDURATION()     Calculates the number of periods required for an investment to reach a specified value
+    - RRI()           Calculates the interest rate required for an investment to grow to a specified future value
+  - Engineering Functions
+    - ERF.PRECISE()   Returns the error function integrated between 0 and a supplied limit
+    - ERFC.PRECISE()  Synonym for ERFC
+  - Math and Trig Functions
+    - SEC()           Returns the secant of an angle
+    - SECH()          Returns the hyperbolic secant of an angle
+    - CSC()           Returns the cosecant of an angle
+    - CSCH()          Returns the hyperbolic cosecant of an angle
+    - COT()           Returns the cotangent of an angle
+    - COTH()          Returns the hyperbolic cotangent of an angle
+    - ACOT()          Returns the cotangent of an angle
+    - ACOTH()         Returns the hyperbolic cotangent of an angle
 
 ### Fixed
 

docs/references/function-list-by-category.md

@@ -41,6 +41,7 @@ DAYS360             | \PhpOffice\PhpSpreadsheet\Calculation\DateTime::DAYS360
 EDATE               | \PhpOffice\PhpSpreadsheet\Calculation\DateTime::EDATE
 EOMONTH             | \PhpOffice\PhpSpreadsheet\Calculation\DateTime::EOMONTH
 HOUR                | \PhpOffice\PhpSpreadsheet\Calculation\DateTime::HOUROFDAY
+ISOWEEKNUM          | \PhpOffice\PhpSpreadsheet\Calculation\DateTime::ISOWEEKNUM
 MINUTE              | \PhpOffice\PhpSpreadsheet\Calculation\DateTime::MINUTE
 MONTH               | \PhpOffice\PhpSpreadsheet\Calculation\DateTime::MONTHOFYEAR
 NETWORKDAYS         | \PhpOffice\PhpSpreadsheet\Calculation\DateTime::NETWORKDAYS
@@ -73,7 +74,9 @@ DEC2HEX             | \PhpOffice\PhpSpreadsheet\Calculation\Engineering::DECTOHE
 DEC2OCT             | \PhpOffice\PhpSpreadsheet\Calculation\Engineering::DECTOOCT
 DELTA               | \PhpOffice\PhpSpreadsheet\Calculation\Engineering::DELTA
 ERF                 | \PhpOffice\PhpSpreadsheet\Calculation\Engineering::ERF
+ERF.PRECISE         | \PhpOffice\PhpSpreadsheet\Calculation\Engineering::ERFPRECISE
 ERFC                | \PhpOffice\PhpSpreadsheet\Calculation\Engineering::ERFC
+ERFC.PRECISE        | \PhpOffice\PhpSpreadsheet\Calculation\Engineering::ERFC
 GESTEP              | \PhpOffice\PhpSpreadsheet\Calculation\Engineering::GESTEP
 HEX2BIN             | \PhpOffice\PhpSpreadsheet\Calculation\Engineering::HEXTOBIN
 HEX2DEC             | \PhpOffice\PhpSpreadsheet\Calculation\Engineering::HEXTODEC
@@ -137,6 +140,7 @@ ODDFPRICE           | **Not yet Implemented**
 ODDFYIELD           | **Not yet Implemented**
 ODDLPRICE           | **Not yet Implemented**
 ODDLYIELD           | **Not yet Implemented**
+PDURATION           | \PhpOffice\PhpSpreadsheet\Calculation\Financial::PDURATION
 PMT                 | \PhpOffice\PhpSpreadsheet\Calculation\Financial::PMT
 PPMT                | \PhpOffice\PhpSpreadsheet\Calculation\Financial::PPMT
 PRICE               | \PhpOffice\PhpSpreadsheet\Calculation\Financial::PRICE
@@ -145,6 +149,7 @@ PRICEMAT            | \PhpOffice\PhpSpreadsheet\Calculation\Financial::PRICEMAT
 PV                  | \PhpOffice\PhpSpreadsheet\Calculation\Financial::PV
 RATE                | \PhpOffice\PhpSpreadsheet\Calculation\Financial::RATE
 RECEIVED            | \PhpOffice\PhpSpreadsheet\Calculation\Financial::RECEIVED
+RRI                 | \PhpOffice\PhpSpreadsheet\Calculation\Financial::RRI
 SLN                 | \PhpOffice\PhpSpreadsheet\Calculation\Financial::SLN
 SYD                 | \PhpOffice\PhpSpreadsheet\Calculation\Financial::SYD
 TBILLEQ             | \PhpOffice\PhpSpreadsheet\Calculation\Financial::TBILLEQ
@@ -169,6 +174,7 @@ ISBLANK             | \PhpOffice\PhpSpreadsheet\Calculation\Functions::IS_BLANK
 ISERR               | \PhpOffice\PhpSpreadsheet\Calculation\Functions::IS_ERR
 ISERROR             | \PhpOffice\PhpSpreadsheet\Calculation\Functions::IS_ERROR
 ISEVEN              | \PhpOffice\PhpSpreadsheet\Calculation\Functions::IS_EVEN
+ISFORMULA           | \PhpOffice\PhpSpreadsheet\Calculation\Functions::ISFORMULA
 ISLOGICAL           | \PhpOffice\PhpSpreadsheet\Calculation\Functions::IS_LOGICAL
 ISNA                | \PhpOffice\PhpSpreadsheet\Calculation\Functions::IS_NA
 ISNONTEXT           | \PhpOffice\PhpSpreadsheet\Calculation\Functions::IS_NONTEXT
@@ -184,13 +190,14 @@ TYPE                | \PhpOffice\PhpSpreadsheet\Calculation\Functions::TYPE
 
 Excel Function      | PhpSpreadsheet Function
 --------------------|-------------------------------------------
-AND                 | \PhpOffice\PhpSpreadsheet\Calculation\Logical::LOGICAL_AND
+AND                 | \PhpOffice\PhpSpreadsheet\Calculation\Logical::logicalAnd
 FALSE               | \PhpOffice\PhpSpreadsheet\Calculation\Logical::FALSE
 IF                  | \PhpOffice\PhpSpreadsheet\Calculation\Logical::STATEMENT_IF
 IFERROR             | \PhpOffice\PhpSpreadsheet\Calculation\Logical::IFERROR
 NOT                 | \PhpOffice\PhpSpreadsheet\Calculation\Logical::NOT
-OR                  | \PhpOffice\PhpSpreadsheet\Calculation\Logical::LOGICAL_OR
+OR                  | \PhpOffice\PhpSpreadsheet\Calculation\Logical::logicalOr
 TRUE                | \PhpOffice\PhpSpreadsheet\Calculation\Logical::TRUE
+XOR                 | \PhpOffice\PhpSpreadsheet\Calculation\Logical::logicalXor
 
 ## CATEGORY_LOOKUP_AND_REFERENCE
 
@@ -201,8 +208,9 @@ AREAS               | **Not yet Implemented**
 CHOOSE              | \PhpOffice\PhpSpreadsheet\Calculation\LookupRef::CHOOSE
 COLUMN              | \PhpOffice\PhpSpreadsheet\Calculation\LookupRef::COLUMN
 COLUMNS             | \PhpOffice\PhpSpreadsheet\Calculation\LookupRef::COLUMNS
+FORMULATEXT         | \PhpOffice\PhpSpreadsheet\Calculation\LookupRef::FORMULATEXT
 GETPIVOTDATA        | **Not yet Implemented**
-HLOOKUP             | **Not yet Implemented**
+HLOOKUP             | \PhpOffice\PhpSpreadsheet\Calculation\LookupRef::HLOOKUP
 HYPERLINK           | \PhpOffice\PhpSpreadsheet\Calculation\LookupRef::HYPERLINK
 INDEX               | \PhpOffice\PhpSpreadsheet\Calculation\LookupRef::INDEX
 INDIRECT            | \PhpOffice\PhpSpreadsheet\Calculation\LookupRef::INDIRECT
@@ -222,6 +230,8 @@ Excel Function      | PhpSpreadsheet Function
 ABS                 | abs
 ACOS                | acos
 ACOSH               | acosh
+ACOT                | \PhpOffice\PhpSpreadsheet\Calculation\MathTrig::ACOT
+ACOTH               | \PhpOffice\PhpSpreadsheet\Calculation\MathTrig::ACOTH
 ASIN                | asin
 ASINH               | asinh
 ATAN                | atan
@@ -231,6 +241,10 @@ CEILING             | \PhpOffice\PhpSpreadsheet\Calculation\MathTrig::CEILING
 COMBIN              | \PhpOffice\PhpSpreadsheet\Calculation\MathTrig::COMBIN
 COS                 | cos
 COSH                | cosh
+COT                 | \PhpOffice\PhpSpreadsheet\Calculation\MathTrig::COT
+COTH                | \PhpOffice\PhpSpreadsheet\Calculation\MathTrig::COTH
+CSC                 | \PhpOffice\PhpSpreadsheet\Calculation\MathTrig::CSC
+CSCH                | \PhpOffice\PhpSpreadsheet\Calculation\MathTrig::CSCH
 DEGREES             | rad2deg
 EVEN                | \PhpOffice\PhpSpreadsheet\Calculation\MathTrig::EVEN
 EXP                 | exp
@@ -261,6 +275,8 @@ ROMAN               | \PhpOffice\PhpSpreadsheet\Calculation\MathTrig::ROMAN
 ROUND               | round
 ROUNDDOWN           | \PhpOffice\PhpSpreadsheet\Calculation\MathTrig::ROUNDDOWN
 ROUNDUP             | \PhpOffice\PhpSpreadsheet\Calculation\MathTrig::ROUNDUP
+SEC                 | \PhpOffice\PhpSpreadsheet\Calculation\MathTrig::SEC
+SECH                | \PhpOffice\PhpSpreadsheet\Calculation\MathTrig::SECH
 SERIESSUM           | \PhpOffice\PhpSpreadsheet\Calculation\MathTrig::SERIESSUM
 SIGN                | \PhpOffice\PhpSpreadsheet\Calculation\MathTrig::SIGN
 SIN                 | sin
@@ -270,7 +286,7 @@ SQRTPI              | \PhpOffice\PhpSpreadsheet\Calculation\MathTrig::SQRTPI
 SUBTOTAL            | \PhpOffice\PhpSpreadsheet\Calculation\MathTrig::SUBTOTAL
 SUM                 | \PhpOffice\PhpSpreadsheet\Calculation\MathTrig::SUM
 SUMIF               | \PhpOffice\PhpSpreadsheet\Calculation\MathTrig::SUMIF
-SUMIFS              | **Not yet Implemented**
+SUMIFS              | \PhpOffice\PhpSpreadsheet\Calculation\MathTrig::SUMIFS
 SUMPRODUCT          | \PhpOffice\PhpSpreadsheet\Calculation\MathTrig::SUMPRODUCT
 SUMSQ               | \PhpOffice\PhpSpreadsheet\Calculation\MathTrig::SUMSQ
 SUMX2MY2            | \PhpOffice\PhpSpreadsheet\Calculation\MathTrig::SUMX2MY2
@@ -336,6 +352,7 @@ MIN                 | \PhpOffice\PhpSpreadsheet\Calculation\Statistical::MIN
 MINA                | \PhpOffice\PhpSpreadsheet\Calculation\Statistical::MINA
 MINIF               | \PhpOffice\PhpSpreadsheet\Calculation\Statistical::MINIF
 MODE                | \PhpOffice\PhpSpreadsheet\Calculation\Statistical::MODE
+MODE.SNGL           | \PhpOffice\PhpSpreadsheet\Calculation\Statistical::MODE
 NEGBINOMDIST        | \PhpOffice\PhpSpreadsheet\Calculation\Statistical::NEGBINOMDIST
 NORMDIST            | \PhpOffice\PhpSpreadsheet\Calculation\Statistical::NORMDIST
 NORMINV             | \PhpOffice\PhpSpreadsheet\Calculation\Statistical::NORMINV
@@ -355,6 +372,8 @@ SLOPE               | \PhpOffice\PhpSpreadsheet\Calculation\Statistical::SLOPE
 SMALL               | \PhpOffice\PhpSpreadsheet\Calculation\Statistical::SMALL
 STANDARDIZE         | \PhpOffice\PhpSpreadsheet\Calculation\Statistical::STANDARDIZE
 STDEV               | \PhpOffice\PhpSpreadsheet\Calculation\Statistical::STDEV
+STDEV.S             | \PhpOffice\PhpSpreadsheet\Calculation\Statistical::STDEV
+STDEV.P             | \PhpOffice\PhpSpreadsheet\Calculation\Statistical::STDEVP
 STDEVA              | \PhpOffice\PhpSpreadsheet\Calculation\Statistical::STDEVA
 STDEVP              | \PhpOffice\PhpSpreadsheet\Calculation\Statistical::STDEVP
 STDEVPA             | \PhpOffice\PhpSpreadsheet\Calculation\Statistical::STDEVPA
@@ -365,6 +384,8 @@ TREND               | \PhpOffice\PhpSpreadsheet\Calculation\Statistical::TREND
 TRIMMEAN            | \PhpOffice\PhpSpreadsheet\Calculation\Statistical::TRIMMEAN
 TTEST               | **Not yet Implemented**
 VAR                 | \PhpOffice\PhpSpreadsheet\Calculation\Statistical::VARFunc
+VAR.P               | \PhpOffice\PhpSpreadsheet\Calculation\Statistical::VARP
+VAR.S               | \PhpOffice\PhpSpreadsheet\Calculation\Statistical::VARFunc
 VARA                | \PhpOffice\PhpSpreadsheet\Calculation\Statistical::VARA
 VARP                | \PhpOffice\PhpSpreadsheet\Calculation\Statistical::VARP
 VARPA               | \PhpOffice\PhpSpreadsheet\Calculation\Statistical::VARPA
@@ -380,9 +401,10 @@ BAHTTEXT            | **Not yet Implemented**
 CHAR                | \PhpOffice\PhpSpreadsheet\Calculation\TextData::CHARACTER
 CLEAN               | \PhpOffice\PhpSpreadsheet\Calculation\TextData::TRIMNONPRINTABLE
 CODE                | \PhpOffice\PhpSpreadsheet\Calculation\TextData::ASCIICODE
+CONCAT              | \PhpOffice\PhpSpreadsheet\Calculation\TextData::CONCATENATE
 CONCATENATE         | \PhpOffice\PhpSpreadsheet\Calculation\TextData::CONCATENATE
 DOLLAR              | \PhpOffice\PhpSpreadsheet\Calculation\TextData::DOLLAR
-EXACT               | **Not yet Implemented**
+EXACT               | \PhpOffice\PhpSpreadsheet\Calculation\TextData::EXACT
 FIND                | \PhpOffice\PhpSpreadsheet\Calculation\TextData::SEARCHSENSITIVE
 FINDB               | \PhpOffice\PhpSpreadsheet\Calculation\TextData::SEARCHSENSITIVE
 FIXED               | \PhpOffice\PhpSpreadsheet\Calculation\TextData::FIXEDFORMAT
@@ -394,6 +416,7 @@ LENB                | \PhpOffice\PhpSpreadsheet\Calculation\TextData::STRINGLENG
 LOWER               | \PhpOffice\PhpSpreadsheet\Calculation\TextData::LOWERCASE
 MID                 | \PhpOffice\PhpSpreadsheet\Calculation\TextData::MID
 MIDB                | \PhpOffice\PhpSpreadsheet\Calculation\TextData::MID
+NUMBERVALUE         | \PhpOffice\PhpSpreadsheet\Calculation\TextData::NUMBERVALUE
 PHONETIC            | **Not yet Implemented**
 PROPER              | \PhpOffice\PhpSpreadsheet\Calculation\TextData::PROPERCASE
 REPLACE             | \PhpOffice\PhpSpreadsheet\Calculation\TextData::REPLACE
@@ -406,6 +429,9 @@ SEARCHB             | \PhpOffice\PhpSpreadsheet\Calculation\TextData::SEARCHINSE
 SUBSTITUTE          | \PhpOffice\PhpSpreadsheet\Calculation\TextData::SUBSTITUTE
 T                   | \PhpOffice\PhpSpreadsheet\Calculation\TextData::RETURNSTRING
 TEXT                | \PhpOffice\PhpSpreadsheet\Calculation\TextData::TEXTFORMAT
+TEXTJOIN            | \PhpOffice\PhpSpreadsheet\Calculation\TextData::TEXTJOIN
 TRIM                | \PhpOffice\PhpSpreadsheet\Calculation\TextData::TRIMSPACES
+UNICHAR             | \PhpOffice\PhpSpreadsheet\Calculation\TextData::CHARACTER
+UNICODE             | \PhpOffice\PhpSpreadsheet\Calculation\TextData::ASCIICODE
 UPPER               | \PhpOffice\PhpSpreadsheet\Calculation\TextData::UPPERCASE
-VALUE               | **Not yet Implemented**
+VALUE               | \PhpOffice\PhpSpreadsheet\Calculation\TextData::VALUE