php - 在选择选项中显示周数

Question

我已经有了这样的选择选项:

<?php
    echo 'Age : <select id="age" name ="age" class="selecta">';
    for($i = 0; $i <= 24; $i += 0.25) 
    { 
?>
    <option value="<?php echo $i ;?>" 
    <?php
    if ($_SESSION['age'] == $i) 
    { 
        echo " selected='selected'"; 
    } 
    ?> > 
    <?php echo $i .'&nbsp&nbsp' ?>
    </option>  
    <?php 
    }
    echo '</select> months <br />';
?>

效果很好并显示:

  0           // means 0 month
  0.25        // means 1 week   or  0.25 of month
  0.50        // means 2 weeks  or half month
  0.75
  1           // means 1 month
  1.25
  ....
  24

但它对用户来说看起来不太好。所以我想要的是让他们像这样:

0      // 0month
1 week  
2 weeks
3 weeks
4 weeks  
1 month
1 month and 1 week
1 month and 2 weeks
.....
24 months

完全一样并不是我最终的愿望，但我想要那样的东西。

这可能吗？

Answer 1

for($i = 0; $i <= 24; $i += 0.25) { 

您在这里进行了 97 次迭代。同样是为了

range(0, 96);

然后您将这些步骤中的任何一个映射到一个特定的数字:

$map = function($step) {
    return $step * 0.25;
}

例如，这将创建以下序列:

0, 0.25, 0.5, 0.75, 1, 1.25, 1.5, 1.75, 2, ... , 23, 23.25, 23.5, 23.75, 24

所以现在您不需要这些数字，只需要美好的月份。如果您更轻松地采取步骤(而不是小数)，您可以计算它们:

month: floor($step / 4)   - division (integer)
weeks: $step % 4          - modulo   (integer)

或者作为将其转换为文本的映射函数:

$map = function ($step) {
    $month = floor($step / 4);
    $week  = $step % 4;

    $buffer = '';

    if ($month) {
        $buffer .= "$month month";
    }

    if ($week) {
        if ($month) {
            $buffer .= ' and ';
        }

        $buffer .=  "$week week" . ($week == 1 ? '' : 's');
    }

    return $buffer;
};

例如:

$map(0)   # (empty)
$map(1)   # 1 week
$map(10)  # 2 month and 3 weeks
$map(95)  # 23 month and 3 weeks
$map(96)  # 24 month

所以现在您只需要将范围作为键映射到它们的值，然后您就可以使用这些值进行选择框的标准输出:

$list = range(0, 96);

$selected = 12; // $_SESSION['age']

echo "Age : \n<select id='age' name ='age' class='selecta'>\n";
foreach ($list as $value)
{
    $label = $map($value);
    printf("  <option value='%d'%s>%s</option>\n", $value, $value === $selected ? " selected='selected'" : '', $label);
}
echo "</select>\n";

它为您提供输出 ( Demo ):

Age : 
<select id='age' name ='age' class='selecta'>
  <option value='0'></option>
  <option value='1'>1 week</option>
  <option value='2'>2 weeks</option>
  <option value='3'>3 weeks</option>
  <option value='4'>1 month</option>
  ...
  <option value='11'>2 month and 3 weeks</option>
  <option value='12' selected='selected'>3 month</option>
  <option value='13'>3 month and 1 week</option>
  ...
  <option value='50'>12 month and 2 weeks</option>
  <option value='51'>12 month and 3 weeks</option>
  <option value='52'>13 month</option>
  <option value='53'>13 month and 1 week</option>
  <option value='54'>13 month and 2 weeks</option>
  ...
  <option value='92'>23 month</option>
  <option value='93'>23 month and 1 week</option>
  <option value='94'>23 month and 2 weeks</option>
  <option value='95'>23 month and 3 weeks</option>
  <option value='96'>24 month</option>
</select>