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run code in 300+ PHP versions simultaneously
<?php $allowed = array('<p>', '<b>', '<i>', '<u>'); print_r(sprintf('Allowed HTML tags: %', implode(' ', $allowed)));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught ValueError: Missing format specifier at end of string in /in/Ri9DZ:4 Stack trace: #0 /in/Ri9DZ(4): sprintf('Allowed HTML ta...', '<p> <b> <i> <u>') #1 {main} thrown in /in/Ri9DZ on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33
Allowed HTML tags:

preferences:
231.32 ms | 405 KiB | 354 Q