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run code in 300+ PHP versions simultaneously
<?php class D { } class C { } unserialize('O:+1:"C":0:{}');
Output for 8.3.0 - 8.3.4, 8.3.6 - 8.3.16, 8.4.1 - 8.4.3
Warning: unserialize(): Error at offset 0 of 13 bytes in /in/YclXi on line 12
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 Warning: unserialize(): Error at offset 0 of 13 bytes in /in/YclXi on line 12
Output for 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.31, 8.2.0 - 8.2.27
Notice: unserialize(): Error at offset 0 of 13 bytes in /in/YclXi on line 12
Output for 5.6.29 - 5.6.40, 7.0.0 - 7.0.33, 7.1.13 - 7.1.33

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