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<?php $session = array( 'car' => new __PHP_Incomplete_Class('Car'), ); try { var_dump((string)$session['car']); } catch (\Throwable $e) { var_dump(123); }
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.4, 8.3.6 - 8.3.7
int(123)
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 int(123)
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33
Recoverable fatal error: Object of class __PHP_Incomplete_Class could not be converted to string in /in/KtJDB on line 8
Process exited with code 255.

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