Online PHP editor | output for QSCvL

@ 2018-06-20T08:18:03Z

<?php

function calcDate($date)
{
    $m = date('m', strtotime('+30 days', strtotime($date)));
    if($m >= 7 && $m< 9){
        $dateSelect = date('Y-09-d', strtotime($date));   
    }else{
        $dateSelect = date('Y-m-d', strtotime('+30 days', strtotime($date)));
    }
    $N =  date("N", strtotime($dateSelect));
    
    if($N >6) $dateSelect = date("Y-m-d", strtotime($dateSelect . " previous Saturday"));  
    
    return $dateSelect;
}

echo calcDate("2018-07-30");

Output for 7.1.0 - 7.1.20, 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 - 8.2.19, 8.3.0 - 8.3.4, 8.3.6 - 8.3.7: 2018-09-29
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 2018-09-29

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