除了最后一个条目之外，如何在数组中的数据之间插入逗号？

Question

我试图将输出设置为使逗号位于除最后一个之外的所有输出项之间。我需要做什么？

echo "The following months have 31 days: ";

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

}

Answer 1

你可以试试这个。 除非您想手动构造逗号分隔字符串，否则可以使用php的implode函数。

<?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);

所以这里我将值存储在另一个数组中，然后将其写为逗号分隔的字符串。

Answer 2

你可以这样做：

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]";
  }

}