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<?php var_dump((string) new Exception(get_class(new class extends stdclass {}) . " failed"));
Output for 8.1.18 - 8.1.33, 8.2.5 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0
string(88) "Exception: stdclass@anonymous/in/e9AGZ:3$0 failed in /in/e9AGZ:3 Stack trace: #0 {main}"
Output for 8.4.15
/bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.17, 8.2.0 - 8.2.4
string(67) "Exception: stdclass@anonymous in /in/e9AGZ:3 Stack trace: #0 {main}"
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
string(64) "Exception: class@anonymous in /in/e9AGZ:3 Stack trace: #0 {main}"
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Parse error: syntax error, unexpected 'class' (T_CLASS) in /in/e9AGZ on line 3
Process exited with code 255.

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