Online PHP editor | output for NjSAe

@ 2018-10-31T03:03:14Z

<?php

$needYear=2018;
$needMonth=10;

                // $_startTime = strtotime('2018-10-31 00:00:00');
                // $_endTime   = strtotime('2018-11-01 00:00:00');
                
                // var_dump(date('Y-n', $_startTime), date('Y-n', $_endTime), $needYear . '-' . $needMonth);
                
                var_dump(date('Y-m-d', strtotime('last day of 2018-10')));
                var_dump(date('Y-m-d', strtotime('2018-10 last day')));
                var_dump(date('Y-m-d', strtotime('first day of 2018-10')));
                var_dump(date('Y-m-d', strtotime('2018-10 first day')));

Output for 5.6.38, 7.1.0 - 7.1.23, 7.2.0 - 7.2.33, 7.3.16 - 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: string(10) "2018-10-31" string(10) "2018-09-30" string(10) "2018-10-01" string(10) "2018-10-02"
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(10) "2018-10-31" string(10) "2018-09-30" string(10) "2018-10-01" string(10) "2018-10-02"

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