Cleanup After Phpstan Upgrade (#2800)

After Phpstan 1.6.3 upgrade, clean up some new problems that will show up if it runs under Php 8+.

phpstan-baseline.neon

@@ -360,11 +360,6 @@ parameters:
 			count: 1
 			path: src/PhpSpreadsheet/Calculation/Engineering/ErfC.php
 
-		-
-			message: "#^Parameter \\#1 \\$callback of function set_error_handler expects \\(callable\\(int, string, string, int, array\\)\\: bool\\)\\|null, array\\{'PhpOffice\\\\\\\\PhpSpreadsheet\\\\\\\\Calculation\\\\\\\\Exception', 'errorHandlerCallback'\\} given\\.$#"
-			count: 1
-			path: src/PhpSpreadsheet/Calculation/ExceptionHandler.php
-
 		-
 			message: "#^Method PhpOffice\\\\PhpSpreadsheet\\\\Calculation\\\\Financial\\:\\:ISPMT\\(\\) has no return type specified\\.$#"
 			count: 1

phpstan-conditional.php

@@ -46,6 +46,13 @@ if (PHP_VERSION_ID < 80000) {
         'path' => __DIR__ . '/src/PhpSpreadsheet/Shared/StringHelper.php',
         'count' => 1,
     ];
+} else {
+    // Flagged in Php8+ - unsure how to correct code
+    $config['parameters']['ignoreErrors'][] = [
+        'message' => '#^Binary operation "/" between float and array[|]float[|]int[|]string results in an error.#',
+        'path' => __DIR__ . '/src/PhpSpreadsheet/Calculation/MathTrig/Combinations.php',
+        'count' => 2,
+    ];
 }
 
 return $config;

src/PhpSpreadsheet/Calculation/ExceptionHandler.php

@@ -9,7 +9,9 @@ class ExceptionHandler
      */
     public function __construct()
     {
-        set_error_handler([Exception::class, 'errorHandlerCallback'], E_ALL);
+        /** @var callable */
+        $callable = [Exception::class, 'errorHandlerCallback'];
+        set_error_handler($callable, E_ALL);
     }
 
     /**

src/PhpSpreadsheet/Reader/Slk.php

@@ -450,7 +450,7 @@ class Slk extends BaseReader
 
                     break;
                 case 'M':
-                    $formatArray['font']['size'] = substr($rowDatum, 1) / 20;
+                    $formatArray['font']['size'] = ((float) substr($rowDatum, 1)) / 20;
 
                     break;
                 case 'L':

src/PhpSpreadsheet/Reader/Xls/MD5.php

@@ -4,8 +4,6 @@ namespace PhpOffice\PhpSpreadsheet\Reader\Xls;
 
 class MD5
 {
-    // Context
-
     /**
      * @var int
      */
@@ -26,11 +24,17 @@ class MD5
      */
     private $d;
 
+    /**
+     * @var int
+     */
+    private static $allOneBits;
+
     /**
      * MD5 stream constructor.
      */
     public function __construct()
     {
+        self::$allOneBits = self::signedInt(0xffffffff);
         $this->reset();
     }
 
@@ -40,8 +44,8 @@ class MD5
     public function reset(): void
     {
         $this->a = 0x67452301;
-        $this->b = 0xEFCDAB89;
-        $this->c = 0x98BADCFE;
+        $this->b = self::signedInt(0xEFCDAB89);
+        $this->c = self::signedInt(0x98BADCFE);
         $this->d = 0x10325476;
     }
 
@@ -156,10 +160,10 @@ class MD5
         self::step($I, $C, $D, $A, $B, $words[2], 15, 0x2ad7d2bb);
         self::step($I, $B, $C, $D, $A, $words[9], 21, 0xeb86d391);
 
-        $this->a = ($this->a + $A) & 0xffffffff;
-        $this->b = ($this->b + $B) & 0xffffffff;
-        $this->c = ($this->c + $C) & 0xffffffff;
-        $this->d = ($this->d + $D) & 0xffffffff;
+        $this->a = ($this->a + $A) & self::$allOneBits;
+        $this->b = ($this->b + $B) & self::$allOneBits;
+        $this->c = ($this->c + $C) & self::$allOneBits;
+        $this->d = ($this->d + $D) & self::$allOneBits;
     }
 
     private static function f(int $X, int $Y, int $Z): int
@@ -182,18 +186,25 @@ class MD5
         return $Y ^ ($X | (~$Z)); // Y XOR (X OR NOT Z)
     }
 
-    private static function step(callable $func, int &$A, int $B, int $C, int $D, int $M, int $s, int $t): void
+    /** @param float|int $t may be float on 32-bit system */
+    private static function step(callable $func, int &$A, int $B, int $C, int $D, int $M, int $s, $t): void
     {
-        $A = ($A + call_user_func($func, $B, $C, $D) + $M + $t) & 0xffffffff;
+        $t = self::signedInt($t);
+        $A = ($A + call_user_func($func, $B, $C, $D) + $M + $t) & self::$allOneBits;
         $A = self::rotate($A, $s);
-        $A = ($B + $A) & 0xffffffff;
+        $A = ($B + $A) & self::$allOneBits;
     }
 
-    /** @return float|int */
-    private static function rotate(int $decimal, int $bits)
+    /** @param float|int $result may be float on 32-bit system */
+    private static function signedInt($result): int
+    {
+        return is_int($result) ? $result : (int) (PHP_INT_MIN + $result - 1 - PHP_INT_MAX);
+    }
+
+    private static function rotate(int $decimal, int $bits): int
     {
         $binary = str_pad(decbin($decimal), 32, '0', STR_PAD_LEFT);
 
-        return bindec(substr($binary, $bits) . substr($binary, 0, $bits));
+        return self::signedInt(bindec(substr($binary, $bits) . substr($binary, 0, $bits)));
     }
 }