3v4l.org

run code in 300+ PHP versions simultaneously
<?php $row = ['a\\"', 'bbb']; $fp = fopen('php://memory', 'w+'); fputcsv($fp, $row); rewind($fp); var_dump(stream_get_contents($fp)); fclose($fp);
Output for 7.0.0 - 7.0.23, 7.1.0 - 7.1.33, 7.2.6 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
string(10) ""a\"",bbb "

preferences:
195.3 ms | 403 KiB | 202 Q