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run code in 300+ PHP versions simultaneously
<?php var_dump(mb_decode_mimeheader(mb_encode_mimeheader('1234567890123456789012', 'ISO-2022-JP-MS', 'B')));
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.12 - 8.1.28, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4, 8.3.6
string(66) "1234567890123456789012"
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 string(66) "1234567890123456789012"
Output for 8.2.18
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.2.18/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.2.18/modules/sodium.so.so (/usr/lib/php/8.2.18/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 string(66) "1234567890123456789012"
Output for 8.1.0 - 8.1.11
string(62) "123456789012345678#9#0#1#2"

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