Adding Decimal Points in PHP

Question

I have a foreach loop that is outputting a bunch of numbers and then I want to take all of those numbers and add them together. However, when I do this, it only adds together whats before the decimal point. I feel like maybe I am missing something with number_format maybe??

Here is the code:

$totalHours = '0';
  foreach ($timeEntries as $entry) {
    $entryID = $entry->id;
    $entryHours = $entry->hours;
    $entryDate = $entry->spent_at;
    $totalHours += $entryHours;
    echo $entryHours."<br />";
  }
  echo "All added up: $totalHours <br />";

And that is displaying the following:

0.7
0.5
0.53
2.6
0.8
0.2
0.5
2.22
1.28
0.57
0.55
0.35
0.5
0.5
1.2
1.4
1.2
0.5
0.82
1.0
0.17
0.33
2.0
1.0
0.5
1.0
0.17
1.97
All added up: 14

Any ideas?

Have you tried casting the numbers as floats? This may help stackoverflow.com/questions/481466/php-string-to-float — Craig
– Craig, Commented Oct 5, 2016 at 16:00
$totalHours should be set to 0.0 (without the quotes), so it's cast as a float from the start, not an string-as-integer. — aynber
– aynber, Commented Oct 5, 2016 at 16:04
@aynber That shouldn't matter. PHP does all arithmetic as floats. — Barmar
– Barmar, Commented Oct 5, 2016 at 16:08
What are the types of $timeEntries, $entry and $entry->hours? It seems like $entry->hours is not a string and also not a float... maybe an object that has float representation as a string? — Dekel
– Dekel, Commented Oct 5, 2016 at 16:11
@Barmar You're correct. I was just testing it out. On the other hand, it's supposed to add up to more than 24, so there's something going on there... — aynber
– aynber, Commented Oct 5, 2016 at 16:11

Shawn Kemp · Accepted Answer · 2016-10-05 16:26:33Z

0

@craig got this one!

Solution was to change it to the following:

  $totalHours = '0';
  foreach ($timeEntries as $entry) {
    $entryID = $entry->id;
    $entryHours = $entry->hours;
    $entryDate = $entry->spent_at;
    $floatHours = (float) $entryHours;
    $totalHours += $floatHours;
  }
  echo "All added up: $totalHours <br />";

answered Oct 5, 2016 at 16:26

Shawn Kemp

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1 Comment

Barmar Over a year ago

This shouldn't be necessary. It works without using the cast. ideone.com/7iu2bI

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