Question

我需要一个帮助。我正在显示一些来自数据库的数据，但我需要在每个循环迭代中使用PHP动态设置类名。我在下面解释我的代码。

<?php
     $class=array('classname'=>'pic1-caption bottom-to-top','classname'=>'pic1-caption top-to-bottom','classname'=>'pic1-caption left-to-right','classname'=>'pic1-caption right-to-left','classname'=>'pic1-caption rotate-in','classname'=>'pic1-caption rotate-out','classname'=>'pic1-caption open-up','classname'=>'pic1-caption open-down','classname'=>'pic1-caption open-left','classname'=>'pic1-caption open-right','classname'=>'pic1-caption come-left','classname'=>'pic1-caption come-right');
     $sql=mysql_query("select * from phr_health_care where status=1  order by health_id desc");
     $key=0;
     while($row=mysql_fetch_array($sql)){
 ?>
<div class="pic1">
 <img src="backend/uploads/<?php echo $row['image'] ?>" class="pic1-image" alt="pic1"/>
 <span class="pic1-caption bottom-to-top"> //here need to set class name dynamically.
 <h1 class="pic1-title">DIABETICS</h1>
 <p class="newp"><?php echo $row['title'] ?></p>
  <a href="health.html" class="detall">Go for Details</a>
</span>

此处所有数据都来自数据库，我需要动态设置span element中的类名，这些类名在$class变量中声明。我也需要在$class变量内声明所有类将在循环继续时完成，它将从开始开始直到db值获取尚未完成。请帮助我。

Answer 1

如果我理解你的问题，这就是你想要做的事情：

<?php
$class=array('A','B','C');
$length = count($class);
$key=0;
while(...) {
  $index = $key % $length;
  $current_class= $class[$index];
  $key += 1;
}

当$ key增长时，$ current_class将循环每个类值。

$ key将采用：0,1,2,3,4,5,6等

但$ index将采用：0,1,2,0,1,2等

所以$ class [$ index]将是：'A'，'B'，'C'，'A'，'B'，'C'等。

（参见http://php.net/manual/en/language.operators.arithmetic.php处的“模数”运算符）

Answer 2

是的，您可以将数组四舍五入以动态使用。这是这类事情的例子。

修改后的脚本：

修改数组：

$class = array('pic1-caption bottom-to-top', 
             'pic1-caption top-to-bottom', 
             'pic1-caption left-to-right', 
             'pic1-caption right-to-left', 
             'pic1-caption rotate-in', 
             'pic1-caption rotate-out', 
             'pic1-caption open-up',
             'pic1-caption open-down',
             'pic1-caption open-left',
             'pic1-caption open-right',
             'pic1-caption come-left',
             'pic1-caption come-right');

SQL：

$sql=mysql_query("select * from phr_health_care where status=1  order by health_id desc");

其余代码：

$len = count($class);
$key = 0;
while($row=mysql_fetch_array($sql)){
?>
<div class="pic1">
    <img src="backend/uploads/<?php echo $row['image'] ?>" class="pic1-image" alt="picture"/>
    <span class="<?php echo $class[$len%$key];?>"> 
        <h1 class="pic1-title">DIABETICS</h1>
        <p class="newp"><?php echo $row['title'] ?></p>
        <a href="health.html" class="detall">Go for Details</a>
    </span>
</div>
<?php 
$key = ($key == ($len-1)) ? 0 : ($key + 1);
}?>

Answer 3

您需要对代码进行一些更改，这些更改由评论本身说明：

您需要将$class数组转换为索引数组而不是关联数组，因为所有键都相同且错误。

<?php
 $class=array('pic1-caption bottom-to-top','pic1-caption top-to-bottom','pic1-caption left-to-right','pic1-caption right-to-left','pic1-caption rotate-in','pic1-caption rotate-out','pic1-caption open-up','pic1-caption open-down','pic1-caption open-left','pic1-caption open-right','pic1-caption come-left','pic1-caption come-right'); //I make it an indexed array because associative array with same key is wrong and give you error
 $sql=mysql_query("select * from phr_health_care where status=1  order by health_id desc");
 $key=0;// start counter 
 $class_count = count($class); // take count of class array
 while($row=mysql_fetch_array($sql)){
 ?>
   <div class="pic1">
   <img src="backend/uploads/<?php echo $row['image'] ?>" class="pic1-image" alt="pic1"/>
   <span class="<?php echo $class[$key];?>"><!--  get classes dynamically-->
     <h1 class="pic1-title">DIABETICS</h1>
     <p class="newp"><?php echo $row['title'] ?></p>
     <a href="health.html" class="detall">Go for Details</a>
   </span>
 <?php 
 if($key == $class_count-1){ // check when classes array values ends start count from 0 again
     $key = 0;
 }else{
    $key++;
 }
}?>

注意： - 由于mysql_*已弃用，现在请使用mysqli_*或PDO。感谢

如何使用PHP

3 个答案: