Online PHP editor | output for SjYiE

@ 2017-05-18T11:32:35Z

<?php

function add_one_month($date) {
    // find the next month
    $nextmonth = mktime(0, 0, 0, date("n", $date) + 1, 1, date("Y", $date));
    // limit the day number according to the month
    $day = min(date("t", $nextmonth), date("j", $date));
    // combine into desired date
    return mktime(0, 0, 0, date("n", $nextmonth), $day, date("Y", $nextmonth));
}

for ($d = 20; $d <= 31; $d++) {
    $date = mktime(0, 0, 0, 1, $d, 2017);
    $normal = date("Y-m-d", strtotime("+1 month", $date));
    $addonemonth = date("Y-m-d", add_one_month($date));
    printf("2017-01-%02d:  +1 month = %s  add_one_month = %s\n", $d, $normal, $addonemonth);
}

Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 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 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3: 2017-01-20: +1 month = 2017-02-20 add_one_month = 2017-02-20 2017-01-21: +1 month = 2017-02-21 add_one_month = 2017-02-21 2017-01-22: +1 month = 2017-02-22 add_one_month = 2017-02-22 2017-01-23: +1 month = 2017-02-23 add_one_month = 2017-02-23 2017-01-24: +1 month = 2017-02-24 add_one_month = 2017-02-24 2017-01-25: +1 month = 2017-02-25 add_one_month = 2017-02-25 2017-01-26: +1 month = 2017-02-26 add_one_month = 2017-02-26 2017-01-27: +1 month = 2017-02-27 add_one_month = 2017-02-27 2017-01-28: +1 month = 2017-02-28 add_one_month = 2017-02-28 2017-01-29: +1 month = 2017-03-01 add_one_month = 2017-02-28 2017-01-30: +1 month = 2017-03-02 add_one_month = 2017-02-28 2017-01-31: +1 month = 2017-03-03 add_one_month = 2017-02-28

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