3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump( mb_check_encoding( "\xf4\x8f\xbf\xbf", 'UTF-8' ) );
Output for 4.4.3 - 4.4.9, 5.1.3 - 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 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 7.2.0 - 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
bool(true)
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.2
Fatal error: Call to undefined function mb_check_encoding() in /in/f3sVb on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.2
Fatal error: Call to undefined function: mb_check_encoding() in /in/f3sVb on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: mb_check_encoding() in /in/f3sVb on line 3

preferences:
245.65 ms | 401 KiB | 420 Q