3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo ' ' . json_encode(round('1.123456789123456789', 10), JSON_NUMERIC_CHECK) . PHP_EOL; echo json_encode('1.123456789123456789');
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
1.1234567891 "1.123456789123456789"
preferences:
139.93 ms | 404 KiB | 174 Q