Php: Populating an Array with the Names of the Next 12 Months

PHP: Populating an array with the names of the next 12 months

Just fixed your code slightly, this should work pretty well:

$months = array();
$currentMonth = (int)date('m');

for ($x = $currentMonth; $x < $currentMonth + 12; $x++) {
    $months[] = date('F', mktime(0, 0, 0, $x, 1));
}

Note that I took out the array key, as I think it's unnecessary, but you can change that of course if you need it.

How to list the last N months with PHP DateTime

You are getting same 2 months, because when you are subtracting 1 month from date, that has more days than previous month. Example: when you subtract 1 month from 31.3. you will get 3.3. (same month), and not 28.2. as you might expect...

My suggestion is to get first day of current month, and then do your logic:

$dt = new DateTime('first day of this month');
for ($i = 1; $i <= 10; $i++) {
    echo $dt->format('F Y'), "\n";
    $dt->modify('-1 month');
}

demo

Get the last 12 months in PHP

I'm sure someone has a more elegant solution, but you could start counting backwards from the 1st of this month.

for ($i = 1; $i <= 12; $i++) {
    $months[] = date("Y-m%", strtotime( date( 'Y-m-01' )." -$i months"));
}

Populating PHP list() with values in an array

You are trying to use a language construct in a manner in which it's not meant to be used. Use variable variables as Alvaro mentioned.

$arr = array('foo', 'bar', 'bash', 'monkey', 'badger');
foreach ($arr as $index => $key) {
    $$key = $data[$index];
}

or

$arr = array('foo', 'bar', 'bash', 'monkey', 'badger');
$result = array();
foreach ($arr as $index => $key) {
    $result[$key] = $data[$index];
}
extract($result);

In short, do not use "list", use arrays and associated arrays. Write helper functions to make your code clearer.

Creating an array of dates with a sequence of intervals between days

Carbon is perfectly able to do this:

// $startDate as mentioned should be a valid Carbon date pointed to Tuesday

$dates = [];
for ($currentDate = $startDate; $currentDate <= $endDate; ) {
    $dates[] = $currentDate;
    $currentDate->addDays(2);
    $dates[] = $currentDate;
    $currentDate->addDays(2);
    $dates[] = $currentDate;
    $currentDate->addDay();
}

Insert new datas into an existing array in PHP

One way to do this is

$yourArray[1] = 149.0;
$yourArray[3] = 1166.0;

$months = range(1, 12);
foreach (array_keys($yourArray) as $month) {
  unset($months[$month - 1]);
}

foreach ($months as $month) {
  $yourArray[$month] = 0.00;
}

• With range you are basically creating ad array with value from 1 to 12.
  
• Next foreach will loop upon your array keys and unset previously setted months, leaving other without a value. The -1 part is due to zero index of array
  
• Final foreach will set to 0.00 remaining values

Populate array by recycling a smaller array starting with a particular value

You have supplied the lookup array, the number of iterations, and the value before the starting value.

The only things left to do are:

1. Find the count of the lookup,
2. Find the index of the last value in the lookup,
3. Loop the expressed number of times,
4. Use a modulus calculation to find the next appropriate value in the lookup, and
5. Push values into the result array.

This can be done with no iterated function calls.

Code: (Demo)

$count = count($list_order_id);
$index = array_search($last_id, $list_order_id);
$result = [];
for ($i = 0; $i < $vacancies; ++$i) {
    $result[] = $list_order_id[++$index % $count];
}
var_export($result);

Populate array of class type in PHP

Just simply add new Fuelprices($year, $coal) objects into the array.

foreach($arrayFromDatabase as $theData){
    $data[] = new Fuelprices($theData['year'], $theData['coal']);
}

In PHP given a month string such as November how can I return 11 without using a 12 part switch statement?

Try

echo date('n', strtotime('November')); // returns 11

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If you have to do this often, you might consider using an array that has these values hardcoded:

$months = array( 1 => 'January', 2 => 'February', 3 => 'March', 4 => 'April',
                 5 => 'May',     6 => 'June',     7 => 'July',  8 => 'August',
                 9 => 'September', 10 => 'October', 11 => 'November',
                 12 => 'December');

Can also do it the other way round though, using the names for the keys and numbers for values.

With the names for values you do

echo array_search('November', $months); // returns 11

and with names for keys you do

echo $months['November']; // returns 11

I find using the numbers for the keys somewhat better in general, though for your UseCase the names for keys approach is likely more comfortable. With just 12 values in the array, there shouldn't be much of a difference between the array approches.

A quick benchmark noted a difference of 0.000003s vs 0.000002s, whereas the time conversion takes 0.000060s on my computer (read: might differ on other computer).

Fill array with values without loop in PHP

use array_fill():

$t = array_fill(0, $n, 'val');

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