Help sorting keys - php

Question

I need help sorting [Time] data from in this array in php. For a given day, the time is NOT in order.
Is there a way to sort this? Thanks.
Array ( [0] => Array ( )
[1] => Array (
[Server] => server1.name
[Date] => Sun Aug 22 2010
[Set] => db2.bak_lvm
[Time] => 06:00:02
[Duration] => 01:28:12
[Size] => 72.05 GB
[Status] => Succeeded )
[2] => Array ( [Server] => server1.name
[Date] => Sun Aug 22 2010
[Set] => db2.bak_lvm
[Time] => 00:00:03
[Duration] => 01:49:37
[Size] => 187.24 GB
[Status] => Succeeded )
[3] => Array ( [Server] => server1.name
[Date] => Sun Aug 22 2010
[Set] => db3.bak_lvm
[Time] => 23:00:03
[Status] => Unsuccessful )
[4] => Array ( [Server] => server1.name
[Date] => Sun Aug 22 2010
[Set] => db4.bak_lvm
[Time] => 04:00:03
[Duration] => 00:42:36
[Size] => 46.46 GB
[Status] => Succeeded )
Here's my php code, thus far:
<?php
$data = array();
$InputFile = file("test.txt");
foreach ($InputFile as $line){
preg_match_all("/([0-9])-([^=]+)=([^;]+);/", $line, $matches, PREG_SET_ORDER);
$LineData = array();
foreach ($matches as $information)
$LineData[$information[2]] = $information[3];
$data[] = $LineData;
}
$keys = array('Server', 'Date','Set','Time','Duration','Size','Status');
echo '<table id="stats"><tr>';
foreach ($keys as $column)
echo '<th>' . $column . '</th>';
echo '</tr>';
$counter=0;
foreach ($data as $row){
$counter ++;
$class = $counter % 2 === 0 ? 'alt1' : 'alt2';
echo '<tr class="' . $class . '">';
foreach ($keys as $column)
if (isset($row[$column])){
echo '<td>' . $row[$column];
} else {
echo '<td>' . '' . '</td>';
}
}
echo '</table>';
print_r($data);
?>
Updated: Latest sort after using suggested fix by Bill. [Time] is in order, but also need to have it sorted within [Date]
Array ( [0] => Array (
[Server] => server1.name
[Date] => Mon Aug 23 2010
[Set] => db2.bak_lvm
[Time] => 00:00:03
[Duration] => 01:50:24
[Size] => 187.24 GB
[Status] => Succeeded )
[1] => Array ( [Server] => server1.name
[Date] => Mon Aug 23 2010
[Set] => db3.bak_lvm
[Time] => 04:00:02
[Duration] => 00:42:28
[Size] => 46.47 GB
[Status] => Succeeded )
[2] => Array ( [Server] => server1.name
[Date] => Sun Aug 22 2010
[Set] => db3.bak_lvm
[Time] => 04:00:03
[Duration] => 00:42:36
[Size] => 46.46 GB
[Status] => Succeeded )
[3] => Array ( [Server] => server1.name
[Date] => Mon Aug 23 2010
[Set] => db1.bak_lvm
[Time] => 06:00:02
[Duration] => 01:28:24
[Size] => 72.05 GB
[Status] => Succeeded )
[4] => Array ( [Server] => server1.name
[Date] => Sun Aug 22 2010
[Set] => db4.bak_lvm
[Time] => 20:00:03
[Duration] => 04:17:57
[Size] => 426.60 GB
[Status] => Succeeded )

Answer 1

edit: Now that I understand your input data better, I've tested this script.
First I read the data file as you do, but I collect the data field by field directly into a two-dimensional array:
<?php
$data = array();
$InputFile = file("test.txt");
foreach ($InputFile as $line)
{
preg_match_all("/([0-9])-([^=]+)=([^;]+);/", $line, $matches, PREG_SET_ORDER);
foreach ($matches as $information)
{
$id = $information[1];
$field = $information[2];
$value = $information[3];
$data[$id][$field] = $value;
}
}
Next I sort the data array with a user-defined sorting function passed to usort(). Thanks to commenters for suggestions to make this function better.
function comparebydatetime($a, $b) {
$adate = strtotime($a["Date"]." ".$a["Time"]);
$bdate = strtotime($b["Date"]." ".$b["Time"]);
return $adate-$bdate;
}
usort($data, "comparebydatetime");
Now the data is sorted by date and time, so I can simply output it:
$keys = array("Server", "Date","Set","Time","Duration","Size","Status");
echo "<table id='stats'>\n";
echo "<tr>\n";
foreach ($keys as $column)
{
echo "<th>" . htmlspecialchars($column) . "</th>\n";
}
echo "</tr>\n";
$counter=0;
foreach ($data as $row)
{
$counter ++;
$class = $counter % 2 === 0 ? "alt1" : "alt2";
echo "<tr class='" . htmlspecialchars($class) . "'>\n";
foreach ($keys as $column)
{
echo "<td>";
if (isset($row[$column]))
{
echo htmlspecialchars($row[$column]);
}
echo "</td>\n";
}
echo "</tr>\n";
}
echo "</table>";
I've also added some other changes for better PHP style:
Be consistent about indentation.
Use curly-braces even for a block with one statement.
Use htmlspecialchars() for outputting dynamic data (including field names, CSS classes, etc.).

Answer 2

If you are on PHP5.3 already, you could use a Heap (manual|wiki) for this:
class SortByDateTimeDescending extends SplMaxHeap
{
public function compare($a, $b)
{
if(!empty($a['Date']) && !empty($a['Time']) &&
!empty($b['Date']) && !empty($b['Time']))
{
$timestampA = strtotime("{$a['Date']} {$a['Time']}");
$timestampB = strtotime("{$b['Date']} {$b['Time']}");
return $timestampA - $timestampB;
}
return 0;
}
}
$sorter = new SortByDateTimeDescending;
array_map(array($sorter, 'insert'), $data);
You can then foreach over $sorter or, if you want the heap back to an array, use
$sortedData = iterator_to_array($sorter);
If you are not on PHP5.3 yet, you can use the code in the compare function to usort() the data. The order will be reversed though (meaning Ascending). Iterating over the sorted array is easy.
You could also use a SortingIterator to go over the array directly.

Answer 3

Simply put : walk over your array and put each date as the key of each child, then ksort() your resulting array.
Don't forget to, if necessary, translate your date in DateTime before setting it as an array key, so that ksort() can work throught it:
$to_be_sorted = array();
foreach($array as $child) {
$date = new DateTime($child["date"].' '.$child["time"]);
$to_be_sorted[$date] = $child;
}
$sorted = ksort($to_be_sorted);
You'll loose your original keys (0,1,...,4) but I assume that it's not a problem ?