Option to customise CSV EOL characters

CHANGELOG.md

@@ -1,5 +1,9 @@
 ### Unreleased
 
+### v2.3.1 (2025-03-12)
+
+* Support option to customize EOL character in CSVWriter
+
 ### v2.3.0 (2025-03-10)
 
 * Support option to write CSV column headers unquoted

src/CSV/CSVWriter.php

@@ -35,6 +35,7 @@ class CSVWriter
     protected $options = [
         'write_utf8_bom' => FALSE,
         'quote_headers' => TRUE,
+        'eol' => "\n",
     ];
 
     /**
@@ -79,7 +80,7 @@ public function write(array $row)
             throw MismatchedSchemaException::forSchema($this->expect_schema, $row_schema);
         }
 
-        \fputcsv($this->resource, $row);
+        \fputcsv($this->resource, $row, eol: $this->options['eol']);
     }
 
     protected function isResourceOpen()
@@ -103,7 +104,7 @@ public function close()
     private function writeHeaders(array $keys): void
     {
         if ($this->options['quote_headers']) {
-            \fputcsv($this->resource, $keys);
+            \fputcsv($this->resource, $keys, eol: $this->options['eol']);
         } else {
             array_walk(
                 $keys,
@@ -112,7 +113,7 @@ private function writeHeaders(array $keys): void
                         "Column header `$str` cannot contain comma if headers are not quoted"
                     )
             );
-            fwrite($this->resource, implode(',', $keys).PHP_EOL);
+            fwrite($this->resource, implode(',', $keys).$this->options['eol']);
         }
     }
 }

test/unit/CSV/CSVWriterTest.php

@@ -194,6 +194,48 @@ public function test_it_throws_if_column_headers_contain_comma_when_unquoted():
         fclose($file);
     }
 
+    public static function providerLineEndings(): array
+    {
+        return [
+            'default' => [
+                [],
+                "\"our big\",is\ndata,here\n",
+            ],
+            'default, with unquoted headers' => [
+                ['quote_headers' => false],
+                "our big,is\ndata,here\n",
+            ],
+            'unix' => [
+                ['eol' => "\n"],
+                "\"our big\",is\ndata,here\n",
+            ],
+            'mac' => [
+                ['eol' => "\r"],
+                "\"our big\",is\rdata,here\r",
+            ],
+            'windows' => [
+                ['eol' => "\r\n"],
+                "\"our big\",is\r\ndata,here\r\n",
+            ],
+            'windows, with unquoted headers' => [
+                ['eol' => "\r\n", 'quote_headers' => false],
+                "our big,is\r\ndata,here\r\n",
+            ],
+        ];
+    }
+
+    #[DataProvider('providerLineEndings')]
+    public function test_its_line_endings_can_be_configured(array $options, string $expect): void
+    {
+        $file = fopen('php://memory', 'w');
+        $subj = $this->newSubject();
+        $subj->open($file, $options);
+        $subj->write(['our big' => 'data', 'is' => 'here']);
+        rewind($file);
+        $this->assertSame($expect, stream_get_contents($file));
+        fclose($file);
+    }
+
     #[TestWith([true])]
     #[TestWith([false])]
     public function test_it_optionally_writes_byte_order_mark_at_start_of_file($write_bom)