diff --git a/src/Symfony/Component/Serializer/Encoder/CsvEncoder.php b/src/Symfony/Component/Serializer/Encoder/CsvEncoder.php
index 8f9c3cff0fb3c..07043d946d751 100644
--- a/src/Symfony/Component/Serializer/Encoder/CsvEncoder.php
+++ b/src/Symfony/Component/Serializer/Encoder/CsvEncoder.php
@@ -65,6 +65,10 @@ public function encode(mixed $data, string $format, array $context = []): string
} elseif (empty($data)) {
$data = [[]];
} else {
+ if ($data instanceof \Traversable) {
+ // Generators can only be iterated once — convert to array to allow multiple traversals
+ $data = iterator_to_array($data);
+ }
// Sequential arrays of arrays are considered as collections
$i = 0;
foreach ($data as $key => $value) {
diff --git a/src/Symfony/Component/Serializer/Tests/Encoder/CsvEncoderTest.php b/src/Symfony/Component/Serializer/Tests/Encoder/CsvEncoderTest.php
index c0be73a8bd685..cde6d333e99f0 100644
--- a/src/Symfony/Component/Serializer/Tests/Encoder/CsvEncoderTest.php
+++ b/src/Symfony/Component/Serializer/Tests/Encoder/CsvEncoderTest.php
@@ -710,4 +710,28 @@ public function testEndOfLinePassedInConstructor()
$encoder = new CsvEncoder([CsvEncoder::END_OF_LINE => "\r\n"]);
$this->assertSame("foo,bar\r\nhello,test\r\n", $encoder->encode($value, 'csv'));
}
+
+ /** @dataProvider provideIterable */
+ public function testIterable(mixed $data)
+ {
+ $this->assertEquals(<<<'CSV'
+ foo,bar
+ hello,"hey ho"
+ hi,"let's go"
+
+ CSV, $this->encoder->encode($data, 'csv'));
+ }
+
+ public static function provideIterable()
+ {
+ $data = [
+ ['foo' => 'hello', 'bar' => 'hey ho'],
+ ['foo' => 'hi', 'bar' => 'let\'s go'],
+ ];
+
+ yield 'array' => [$data];
+ yield 'array iterator' => [new \ArrayIterator($data)];
+ yield 'iterator aggregate' => [new \IteratorIterator(new \ArrayIterator($data))];
+ yield 'generator' => [(fn (): \Generator => yield from $data)()];
+ }
}
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