php数组中的重复值

Question

我想做一个计划，每4天重复一次这个值.下面的php脚本循环的日期从1-9月30日至9月30日.我想每4天重复这个值一次.例如，我的值是(A，B，C，D)，我想重复每一个4day...thats平均值

1/9 = A 
2/9 = B 
3/9 = C 
4/9 = D 
5/9 = A 
6/9 = B 
7/9 = C 
8/9 = D 

.直到30/9然后停止..。

<?php  
// Set timezone
date_default_timezone_set('UTC');

// Start date
$start_date = '2015-09-01';
// End date
$end_date = '2015-09-30';

$value = "A";

while (strtotime($start_date) <= strtotime($end_date)) {
echo "$start_date <br>";
$start_date = date ("Y-m-d", strtotime("+1 day", strtotime($start_date)));

}
 ?>

Answer 1

像这样的东西呢？

$values = ['A', 'B', 'C', 'D'];

// Start date
$start_date = '2015-09-01';
// End date
$end_date = '2015-09-30';

$current_date = $start_date;
$index = 0;
while (strtotime($current_date) <= strtotime($end_date)) {
    $i = $index % count($values);
    echo "$current_date: $values[$i]\n";
    $current_date = date("Y-m-d", strtotime("+1 day", strtotime($current_date)));
    $index++;
}

%是一个模算子，它返回除法的剩余部分。$a % $b返回$a的剩余部分除以$b。例如6 % 4是2，7 % 4是3，依此类推。

Answer 2

另一个版本是：

<?php  
// Set timezone
date_default_timezone_set('UTC');

// Start date
$start_date = strtotime('2015-09-01');
// End date
$end_date = strtotime('2015-09-30');

$value = "A";

for ($date = $start_date; $date <= $end_date; 
     $date = strtotime("+1 day", $date)) {
  $date_str = date("Y-m-d", $date);
  echo "$date_str: $value<br>\n";
  $value++;
  if ($value > "D") {
    $value = "A";
  }
}
?>

注意:虽然变量有日期后缀，但它们包含UNIX时间值，而不是某种日期对象。

Answer 3

<?php
// Set timezone
date_default_timezone_set('UTC');

// Start date
$start_date = '2015-09-01';
// End date
$end_date   = '2015-09-30';

$value = array(
    "A",
    "B",
    "C",
    "D"
);
$i     = 0;
while (strtotime($start_date) <= strtotime($end_date)) {
    echo "$start_date = " . $value[$i] . " <br>";
    if ($i == count($value) - 1) {
        $i = 0;
    } else {
        $i++;
    }
    $start_date = date("Y-m-d", strtotime("+1 day", strtotime($start_date)));

}
?>