php循环 - 检查总数之前的最后一个数字

Question

Let's say that you have an array of 30 characters and you are looping through them to build a visual grid in HTML. I want to know when it's on the last row of items and apply a CSS rule. For every 8th item, I can use the code below to apply an additional CSS rule:

$cnt=1;
foreach ($characters as $index => $character){
   if ($cnt % 8==0) echo "newline";
   $cnt++;
}

Since I only have 30 characters, there will be 3 lines with a shorter 4th line (it will only have 6 items). How can I flag every character from 24-30 as belonging to the last row. The total number of characters will always vary.

Answer 1

$rowCount = 8; // the number of items per row
$lastRowStarts = intval(floor(count($characters) / $rowCount)) * $rowCount;
// e.g: floor(30 / 8) * 8 = 3 * 8 = 24 = <index of first item in last row>

$index = 1;
foreach ($characters as $character) {
   if ($index >= $lastRowStarts) echo "last line";

   $index++;
}