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<?php class someClass { public $foo; public function __destruct() { echo "__destruct(): Exterminate! Exterminate!\n"; } } demo(); echo "Back in main.\n"; function demo() { echo "Demo starts.\n"; $s = serialize(new class { public $foo; public function __destruct() { echo "__destruct(): Exterminate! Exterminate!\n"; } }); #var_dump($s); echo "\n"; echo $s; echo "\n\n"; #$u = unserialize($s); #var_dump($u); echo "Demo's over.\n"; }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Demo starts. Fatal error: Uncaught Exception: Serialization of 'class@anonymous' is not allowed in /in/DUXPJ:15 Stack trace: #0 /in/DUXPJ(15): serialize(Object(class@anonymous)) #1 /in/DUXPJ(10): demo() #2 {main} thrown in /in/DUXPJ on line 15 __destruct(): Exterminate! Exterminate!
Process exited with code 255.
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 Demo starts. Fatal error: Uncaught Exception: Serialization of 'class@anonymous' is not allowed in /in/DUXPJ:15 Stack trace: #0 /in/DUXPJ(15): serialize(Object(class@anonymous)) #1 /in/DUXPJ(10): demo() #2 {main} thrown in /in/DUXPJ on line 15 __destruct(): Exterminate! Exterminate!
Process exited with code 255.
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
Demo starts. Fatal error: Uncaught Exception: Serialization of 'class@anonymous' is not allowed in /in/DUXPJ:15 Stack trace: #0 /in/DUXPJ(15): serialize(Object(class@anonymous)) #1 /in/DUXPJ(10): demo() #2 {main} thrown in /in/DUXPJ on line 15
Process exited with code 255.
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Parse error: syntax error, unexpected 'class' (T_CLASS) in /in/DUXPJ on line 15
Process exited with code 255.

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