如何在除最后一项以外的数组数据之间插入逗号？

Question

I'm trying to get my output to be so that commas are between all the output items except for the last one. What do I need to do?

echo "The following months have 31 days: ";

for ($count=0; $count <= (count($daysInMonth) - 1); $count++) {
  if ($daysInMonth[$count] == 31){
    echo "$months[$count]" . ", ";
  }

}

Answer 1

You could try this. Unless you want to manually construct the comma separated string you can use the implode function of php.

<?php
$longMonths = array();
$daysInMonth = [31,30,31];
$months = ['Jan','Sep','Dec'];

for ($count=0; $count <= (count($daysInMonth) - 1); $count++) {
  if ($daysInMonth[$count] == 31){
    $longMonths[] = $months[$count];
  }
}
echo implode(', ', $longMonths);

So here I am storing the values in another array and then writing it as a comma separated string.

Answer 2

You can do this:

echo "The following months have 31 days: ";

for ($count=0; $count <= (count($daysInMonth) - 1); $count++) {
  if ($daysInMonth[$count] == 31 && $months[$count] != "December"){
    echo "$months[$count]" . ", ";
  }

  if ($daysInMonth[$count] == 31 && $months[$count] == "December") {
    echo "$months[$count]";
  }

}