Merge pull request #3401 from PHPOffice/NumberFormatter-Improved-Fractions

Allow use of # and 0 digit placeholders in fraction masks

src/PhpSpreadsheet/Style/NumberFormat/NumberFormatter.php

@@ -211,7 +211,10 @@ class NumberFormatter
         $useThousands = self::areThousandsRequired($format);
         $scale = self::scaleThousandsMillions($format);
 
-        if (preg_match('/#?.*\?\/(\?+|\d+)/', $format)) {
+        if (preg_match('/[#\?0]?.*[#\?0]\/(\?+|\d+|#)/', $format)) {
+            // It's a dirty hack; but replace # and 0 digit placeholders with ?
+            $format = (string) preg_replace('/[#0]+\//', '?/', $format);
+            $format = (string) preg_replace('/\/[#0]+/', '/?', $format);
             $value = FractionFormatter::format($value, $format);
         } else {
             // Handle the number itself

tests/data/Style/NumberFormatFractions.php

@@ -9,6 +9,26 @@ return [
         5.25,
         '# ???/???',
     ],
+    [
+        '5 2/8',
+        5.25,
+        '# ???/8',
+    ],
+    [
+        '5 4/16',
+        5.25,
+        '# ???/16',
+    ],
+    [
+        '5 1/4',
+        5.25,
+        '# ##0/000',
+    ],
+    [
+        '5 1/4',
+        5.25,
+        '# ##0/###',
+    ],
     [
         '5 3/10',
         5.2999999999999998,