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run code in 300+ PHP versions simultaneously
<?php $dni = '342501198701065'; $row = str_split($dni); $letters = array_combine(range(0,25), range('a', 'z')); //now just use: foreach($row as $n) echo $letters[$n];
Output for 5.6.0 - 5.6.26, 7.0.1, 7.0.3 - 7.0.11, 7.1.0, 7.2.29 - 7.2.33, 7.3.16 - 7.3.33, 7.4.3 - 7.4.33, 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
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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 decfabbjihabagf
Output for 7.0.0, 7.0.2

Process exited with code 137.
preferences:
169.5 ms | 401 KiB | 179 Q