Question

This is a very odd problem and I’m sorry in advance about the title of the question, but I can’t think of a good one.

Anyway, I have an array of prices, one for every day of the week.

 array = (
   [Mon] => 0.40,
   [Tue] => 0.40,
   [Wed] => 0.40,
   [Thu] => 0.40,
   [Fri] => 0.40,
   [Sat] => 0.50,
   [Sun] => 
 )

As you can see one or more days can be empty and the prices can be different every day.

I need to get a string like

 Mon - Fri 0.40, Sat 0.50

I kind of need to flat the array, as long as the price is the same.

The one above is just an example, I may have “holes” in the array, so for example if I didn’t have a price for Wednesday, then the resulting string should be

 Mon - Tue 0.40, Thu - Fri 0.40, Sat 0.50

Any suggestion how I can do this in PHP?

Answer 1

You can try this …

Your array

$array = array(
        "Mon" => 0.40,
        "Tue" => 0.40,
        "Wed" => 0.40,
        "Thu" => 0.40,
        "Fri" => 0.40,
        "Sat" => 0.50,
        "Sun" => null);

Example 1

var_dump(groupDateTime($array));

Output

array
  0 => 
    array
      's' => string 'Mon' (length=3)
      'e' => string 'Fri' (length=3)
      't' => float 0.4
  1 => 
    array
      's' => string 'Sat' (length=3)
      'e' => string 'Sat' (length=3)
      't' => float 0.5

Example 2

 var_dump(groupDateTime($array,true));
                                ^---------- Optional Formatting 

Output

array
  0 => string 'Mon - Fri 0.4' (length=13)
  1 => string 'Sat 0.5' (length=7)

Function Used

function groupDateTime($array, $format = false) {
    $group = array();
    $x = 0;
    foreach ( $array as $day => $time ) {
        if (empty($group[$x]) === true) {
            $group[$x]['s'] = $day;
            $group[$x]['e'] = $day;
            $group[$x]['t'] = $time;
        }
        if ($group[$x]['t'] === $time) {
            $group[$x]['e'] = $day;
            continue;
        }
        $x ++;
        $group[$x]['s'] = $day;
        $group[$x]['e'] = $day;
        $group[$x]['t'] = $time;
    }

    $group = array_filter($group, function ($v) {
        return ! empty($v['t']);
    });
    if ($format === true)
        $group = array_map(function ($v) {
            if ($v['s'] == $v['e'])
                return "{$v['s']} {$v['t']}";
            return "{$v['s']} - {$v['e']} {$v['t']}";
        }, $group);
    return $group;
}