Online PHP editor | output for KXUXc

@ 2020-01-08T15:18:10Z

<?php

$date_string = '2020W01';

$from = date('Y-m-d', strtotime($date_string));
$to = date('Y-m-d', strtotime($date_string . '7'));

echo $from .' - '. $to .'<br/>';

$from = date('o-W', strtotime($date_string));
$to = date('o-W', strtotime($date_string .'7'));

echo $from .' - '. $to .'<br/>';

$from = date('o-W', mktime(0,0,0,12,30,2019));

echo $from;

Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 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: 2019-12-30 - 2020-01-05<br/>2020-01 - 2020-01<br/>2020-01
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 2019-12-30 - 2020-01-05<br/>2020-01 - 2020-01<br/>2020-01

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