Cast empty headers to int

CHANGELOG.md

@@ -7,6 +7,7 @@ All notable changes to this project will be documented in this file.
 
 ### Changed
 - Support `WithValidation` concern to allow validations with `Excel::toArray()` and `Excel::toCollection()`
+- Cast empty headings to indexed integer
 
 ### Fixed
 

src/Imports/HeadingRowFormatter.php

@@ -91,6 +91,10 @@ protected static function callFormatter($value, $key=null)
             return $formatter($value, $key);
         }
 
+        if (empty($value)) {
+            return $key;
+        }
+
         if (static::$formatter === self::FORMATTER_SLUG) {
             return Str::slug($value, '_');
         }

tests/Concerns/WithHeadingRowTest.php

@@ -3,8 +3,10 @@
 namespace Maatwebsite\Excel\Tests\Concerns;
 
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Support\Collection;
 use Maatwebsite\Excel\Concerns\Importable;
 use Maatwebsite\Excel\Concerns\ToArray;
+use Maatwebsite\Excel\Concerns\ToCollection;
 use Maatwebsite\Excel\Concerns\ToModel;
 use Maatwebsite\Excel\Concerns\WithHeadingRow;
 use Maatwebsite\Excel\Tests\Data\Stubs\Database\User;
@@ -180,4 +182,32 @@ public function model(array $row): Model
         $import->import('import-empty-users-with-headings.xlsx');
         $this->assertEmpty(User::all());
     }
+
+    /**
+     * @test
+     */
+    public function can_cast_empty_headers_to_indexed_int()
+    {
+        $import = new class() implements ToCollection, WithHeadingRow
+        {
+            use Importable;
+
+            public $called = false;
+
+            public function collection(Collection $collection)
+            {
+                $this->called = true;
+
+                Assert::assertEquals([
+                    0 => 0,
+                    1 => 'email',
+                    2 => 'status',
+                    3 => 3,
+                ], $collection->first()->keys()->toArray());
+            }
+        };
+
+        $import->import('import-users-with-mixed-headings.xlsx');
+        $this->assertTrue($import->called);
+    }
 }

tests/Data/Disks/Local/.gitignore

@@ -23,4 +23,5 @@
 !csv-with-html-tags.csv
 !import-external-reference.xls
 !csv-with-comma.csv
-!import-users-with-grouped-headers.xlsx
+!import-users-with-grouped-headers.xlsx
+!import-users-with-mixed-headings.xlsx