循环中的图像与PHP中的不同div类

Question

假设我有像下面这样的代码

<?php 
$sql = "SELECT * FROM images";
$query = mysql_query($sql);

while($row = mysql_fetch_assoc($query)) {
    echo '<div class="single">';
    echo '<img src="'.$row['image'].'" alt="'.$row['title'].' " />';
    echo '</div>';
} 
?>

我想追加first并last在DIV类<div class="single">的每一套5张,即

<div class="single first">
    <img src="image1.jpg" alt="title1" />
</div>

<div class="single">
    <img src="image2.jpg" alt="title2" />
</div>

<div class="single">
    <img src="image3.jpg" alt="title3" />
</div>

<div class="single">
    <img src="image4.jpg" alt="title4" />
</div>

<div class="single last">
    <img src="image5.jpg" alt="title5" />
</div>

如何通过循环,请帮助,

谢谢 :)

Answer 1

使用modulo:

<?php 
$sql = "SELECT * FROM images";
$query = mysql_query($sql);

$i = 0;
$class = "";

while($row = mysql_fetch_assoc($query)) {

    if($i % 5 == 0){
        $class = 'first';
    }else if($i % 5 == 4){
        $class = 'last';
    }else{
        $class = "";
    }

    echo '<div class="single ' . $class . '">';
    echo '<img src="'.$row['image'].'" alt="'.$row['title'].' " />';
    echo '</div>';

    $i++;
} 
?>