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December 5, 2019 09:15
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Export CSV low memory fingerprint using iterator - HTTP Streamed Response & CLI
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<?php | |
function csvToStdOut(array $headers, iterable $rows, string $delimiter = ','): void | |
{ | |
$resource = fopen('php://output', 'wb'); | |
fputcsv($resource, $headers, $delimiter); | |
foreach ($rows as $row) { | |
fputcsv($resource, $row, $delimiter); | |
} | |
fclose($resource); | |
} | |
$generator = function() { | |
foreach($names as $name) { | |
yield [ | |
$name, | |
]; | |
} | |
} | |
csvToStdOut(['name'], $generator()); |
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<?php | |
use Symfony\Component\HttpFoundation\Response; | |
use Symfony\Component\HttpFoundation\ResponseHeaderBag; | |
use Symfony\Component\HttpFoundation\StreamedResponse; | |
function createStreamedResponseCSV(string $filename, array $headers, iterable $rows, string $delimiter = ','): Response | |
{ | |
$response = new StreamedResponse(function () use ($headers, $generator) { | |
$resource = fopen('php://output', 'wb'); | |
fputcsv($resource, $headers, $delimiter); | |
foreach ($rows as $row) { | |
fputcsv($resource, $row, $delimiter); | |
} | |
fclose($resource); | |
}); | |
$disposition = $response->headers->makeDisposition( | |
ResponseHeaderBag::DISPOSITION_INLINE, | |
$filename | |
); | |
$response->headers->set('Content-Disposition', $disposition); | |
$response->headers->set('Content-Encoding', 'none'); | |
$response->headers->set('Content-Type', 'text/csv; charset=UTF-8'); | |
return $response; | |
} | |
$generator = function() { | |
foreach($names as $name) { | |
yield [ | |
$name, | |
]; | |
} | |
} | |
$response = createStreamedResponseCSV('export.csv', ['name'], $generator()); |
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