PHP Date Difference After 30 Days Error? - php

Question

I have a date difference that works in minutes .. then after 1 hour goes to hours .. then after 24 hours goes to days .. then weirdly after 30 days it goes back to hours
For why?! What am I missing in this code or is this some bug?!
$d_start = new DateTime('now');
$d_end = new DateTime($last_gdate);
$d_dif = $d_start->diff($d_end);
$d_d = $d_dif->d;
$d_h = $d_dif->h;
$d_m = $d_dif->i;
if ($d_d < 1) {
if ($d_h < 1) {
$d_since = $d_m . "m";
} else {
$d_since = $d_h . "h";
}
} else {
$d_since = $d_d . "d";
}

Answer 1

You will notice that DateTime's diff() will restart d in the next month. You should use days if you are not going to check/honor m.
Code: (Demo)
$last_gdate = "2018-07-23 00:01:02";
$d_start = new DateTime('now');
$d_end = new DateTime($last_gdate);
$d_dif = $d_start->diff($d_end);
var_export($d_dif);
$d_d = $d_dif->days;
$d_h = $d_dif->h;
$d_m = $d_dif->i;
if ($d_d < 1) {
if ($d_h < 1) {
$d_since = $d_m . "m";
} else {
$d_since = $d_h . "h";
}
} else {
$d_since = $d_d . "d";
}
echo "\n$d_since";
Output:
DateInterval::__set_state(array(
'y' => 0,
'm' => 1,
'd' => 0,
'h' => 6,
'i' => 42,
's' => 2,
'f' => 0.002468,
'weekday' => 0,
'weekday_behavior' => 0,
'first_last_day_of' => 0,
'invert' => 1,
'days' => 31,
'special_type' => 0,
'special_amount' => 0,
'have_weekday_relative' => 0,
'have_special_relative' => 0,
))
31d