Declare a few return datatypes

Author: MarkBaker

phpstan-baseline.neon

@@ -2265,11 +2265,6 @@ parameters:
 			count: 1
 			path: src/PhpSpreadsheet/Reader/Xlsx.php
 
-		-
-			message: "#^Method PhpOffice\\\\PhpSpreadsheet\\\\Reader\\\\Xlsx\\:\\:boolean\\(\\) has no return type specified\\.$#"
-			count: 1
-			path: src/PhpSpreadsheet/Reader/Xlsx.php
-
 		-
 			message: "#^Method PhpOffice\\\\PhpSpreadsheet\\\\Reader\\\\Xlsx\\:\\:boolean\\(\\) has parameter \\$value with no type specified\\.$#"
 			count: 1
@@ -2340,11 +2335,6 @@ parameters:
 			count: 1
 			path: src/PhpSpreadsheet/Reader/Xlsx.php
 
-		-
-			message: "#^Method PhpOffice\\\\PhpSpreadsheet\\\\Reader\\\\Xlsx\\:\\:dirAdd\\(\\) has no return type specified\\.$#"
-			count: 1
-			path: src/PhpSpreadsheet/Reader/Xlsx.php
-
 		-
 			message: "#^Method PhpOffice\\\\PhpSpreadsheet\\\\Reader\\\\Xlsx\\:\\:dirAdd\\(\\) has parameter \\$add with no type specified\\.$#"
 			count: 1
@@ -2405,21 +2395,11 @@ parameters:
 			count: 1
 			path: src/PhpSpreadsheet/Reader/Xlsx.php
 
-		-
-			message: "#^Method PhpOffice\\\\PhpSpreadsheet\\\\Reader\\\\Xlsx\\:\\:stripWhiteSpaceFromStyleString\\(\\) has no return type specified\\.$#"
-			count: 1
-			path: src/PhpSpreadsheet/Reader/Xlsx.php
-
 		-
 			message: "#^Method PhpOffice\\\\PhpSpreadsheet\\\\Reader\\\\Xlsx\\:\\:stripWhiteSpaceFromStyleString\\(\\) has parameter \\$string with no type specified\\.$#"
 			count: 1
 			path: src/PhpSpreadsheet/Reader/Xlsx.php
 
-		-
-			message: "#^Method PhpOffice\\\\PhpSpreadsheet\\\\Reader\\\\Xlsx\\:\\:toCSSArray\\(\\) has no return type specified\\.$#"
-			count: 1
-			path: src/PhpSpreadsheet/Reader/Xlsx.php
-
 		-
 			message: "#^Method PhpOffice\\\\PhpSpreadsheet\\\\Reader\\\\Xlsx\\:\\:toCSSArray\\(\\) has parameter \\$style with no type specified\\.$#"
 			count: 1
@@ -4885,8 +4865,3 @@ parameters:
 			count: 2
 			path: src/PhpSpreadsheet/Writer/Xlsx/Worksheet.php
 
-		-
-			message: "#^Method PhpOffice\\\\PhpSpreadsheet\\\\Writer\\\\Xlsx\\\\Xlfn\\:\\:addXlfn\\(\\) should return string but returns string\\|null\\.$#"
-			count: 1
-			path: src/PhpSpreadsheet/Writer/Xlsx/Xlfn.php
-

src/PhpSpreadsheet/Calculation/TextData/Trim.php

@@ -14,7 +14,7 @@ class Trim
      * @param mixed $stringValue String Value to check
      *                              Or can be an array of values
      *
-     * @return null|array|string
+     * @return array|string
      *         If an array of values is passed as the argument, then the returned result will also be an array
      *            with the same dimensions
      */
@@ -26,7 +26,7 @@ public static function nonPrintable($stringValue = '')
 
         $stringValue = Helpers::extractString($stringValue);
 
-        return preg_replace('/[\\x00-\\x1f]/', '', "$stringValue");
+        return (string) preg_replace('/[\\x00-\\x1f]/', '', "$stringValue");
     }
 
     /**

src/PhpSpreadsheet/Reader/Xlsx.php

@@ -1461,7 +1461,7 @@ protected function loadSpreadsheetFromFile(string $filename): Spreadsheet
                                     }
 
                                     // unparsed drawing AlternateContent
-                                    $xmlAltDrawing = $this->loadZip($fileDrawing, Namespaces::COMPATIBILITY);
+                                    $xmlAltDrawing = $this->loadZip((string) $fileDrawing, Namespaces::COMPATIBILITY);
 
                                     if ($xmlAltDrawing->AlternateContent) {
                                         foreach ($xmlAltDrawing->AlternateContent as $alternateContent) {
@@ -1821,12 +1821,12 @@ private static function getArrayItem($array, $key = 0)
         return $array[$key] ?? null;
     }
 
-    private static function dirAdd($base, $add)
+    private static function dirAdd($base, $add): string
     {
-        return preg_replace('~[^/]+/\.\./~', '', dirname($base) . "/$add");
+        return (string) preg_replace('~[^/]+/\.\./~', '', dirname($base) . "/$add");
     }
 
-    private static function toCSSArray($style)
+    private static function toCSSArray($style): array
     {
         $style = self::stripWhiteSpaceFromStyleString($style);
 
@@ -1857,12 +1857,12 @@ private static function toCSSArray($style)
         return $style;
     }
 
-    public static function stripWhiteSpaceFromStyleString($string)
+    public static function stripWhiteSpaceFromStyleString($string): string
     {
         return trim(str_replace(["\r", "\n", ' '], '', $string), ';');
     }
 
-    private static function boolean($value)
+    private static function boolean($value): bool
     {
         if (is_object($value)) {
             $value = (string) $value;

src/PhpSpreadsheet/Writer/Xlsx/Xlfn.php

@@ -152,7 +152,7 @@ class Xlfn
      */
     public static function addXlfn(string $funcstring): string
     {
-        return preg_replace(self::XLFNREGEXP, '_xlfn.$1', $funcstring);
+        return (string) preg_replace(self::XLFNREGEXP, '_xlfn.$1', $funcstring);
     }
 
     /**