如何在动态下拉菜单

Question

我有一个动态的下拉菜单，显示从数1-10每个值插入下面这些值：

$min_year = 1; 
$max_year = 10; 
$years = range($min_year, $max_year); // returns array with numeric values of 1900 - 2012 
$durationHTML = ''; 
$durationHTML .= '<select name="duration" id="durationDrop">'.PHP_EOL; 
$durationHTML .= '<option value="">Please Select</option>'.PHP_EOL; 
foreach ($years as $year) { 
    $durationHTML .= "<option>$year</option>".PHP_EOL; // if no value attribute, value will be whatever is inside option tag, in this case, $year 
} 
$durationHTML .= '</select>'; 

我想，虽然做的是改变的值，所以它显示下面这些值：

1 
1/2 
2 
2/3 
3 
3/4 
4 
4/5 
5 
5/6 
6 
6/7 
7 
7/8 
8 
8/9 
9 
9/10 
10 

我的问题是，我该如何动态显示上述这些值？

UPDATE：

$min_year = 1; 
$max_year = 10; 
$years = range($min_year, $max_year); // returns array with numeric values of 1900 - 2012 
$durationHTML = ''; 
$durationHTML .= '<select name="duration" id="durationDrop">'.PHP_EOL; 
$durationHTML .= '<option value="">Please Select</option>'.PHP_EOL; 

for($i = 0; $i < sizeof($years); $i++) 
{ 
    $current_year = $years[$i]; 
    $durationHTML .= "<option>{$current_year}</option"; 
    if($i != (sizeof($years) - 1)) //So you don't try to grab 11 because it doesn't exist. 
    { 
    $next_year = $years[$i+1]; 
    $durationHTML .= "<option>{$current_year}/{$next_year}</option>"; 
    } 
} 

$durationHTML .= '</select>'; 

下面是它的输出：

11/2 
22/3 
33/4 
44/5 
55/6 
66/7 
77/8 
88/9 
99/10 
10 

Answer 1

这样的事情应该适合你;

$min_year = 1; 
$max_year = 10; 
$years = range($min_year, $max_year); // returns array with numeric values of 1900 - 2012 
$durationHTML = ''; 
$durationHTML .= '<select name="duration" id="durationDrop">'.PHP_EOL; 
$durationHTML .= '<option value="">Please Select</option>'.PHP_EOL; 
foreach ($years as $year) { 
    $durationHTML .= "<option>$year</option>".PHP_EOL; 
    if ($year != $max_year) { 
     $nextYear = $year + 1; 
     $durationHTML .= "<option>$year/$nextYear</option>".PHP_EOL;    
    } 
} 
$durationHTML .= '</select>'; 

Answer 2

可能有几种方法可以做到这一点。

最简单的方法是将您的foreach循环更改为简单的for循环，并获取下一个值并使用它来形成分数。我这样做是为了更容易阅读，但不需要将current_year和next_year存储在变量中，您可以直接从数组中回显它们。

for($i = 0; $i < sizeof($years); $i++) 
{ 
    $current_year = $years[$i]; 
    echo "<option>{$current_year}</option"; 
    if($i != (sizeof($years) - 1)) //So you don't try to grab 11 because it doesn't exist. 
    { 
    $next_year = $years[$i+1]; 
    echo "<option>{$current_year}/{$next_year}</option>"; 
    } 
}