在一个foreach字符串中添加一个css类

问题描述：

我有下面的代码，它显示wordpress模板中的相关项目，但我想添加一个类，每个第二个项目都附加了一个css类right，我需要什么修改来实现这个？在一个foreach字符串中添加一个css类

<?php $rel = $related->show(get_the_ID(), true); 
    foreach ($rel as $r) : 
    echo '<div class=related-item><a href='.get_permalink($r->ID).'>'.'<div class=page-related-title>'.$r->post_title.'</div>'.get_the_post_thumbnail($r->ID, array(50,50)).'</a></div>'; 
    endforeach;?>

虽然这是WordPress的关系我想这是更多的与一般的PHP编码所以psoting这里，而不是在WPSE。

答

试试这个

<?php $rel = $related->show(get_the_ID(), true); 
$count = 0; 
foreach ($rel as $r) { 
$class= ($count%2 == 0)?"right":""; 

echo '<div class="related-item '.$class.'"><a href='.get_permalink($r->ID).'>'.'<div class=page-related-title>'.$r->post_title.'</div>'.get_the_post_thumbnail($r->ID, array(50,50)).'</a></div>'; 
$count++; 
}?>

丢弃了代码并且页面没有工作，在Dreamweaver中查看提示它告诉我在此编码的第四行有一个语法错误... – 2012-03-02 09:43:52

以及语法错误已得到修复 – 2012-03-02 09:44:37

完美，谢谢 – 2012-03-02 09:48:06

答

<?php $rel = $related->show(get_the_ID(), true); 
     $i = 0; 
     foreach ($rel as $r) { 
      echo '<div class=related-item' . ($i++ % 2 ? '' : ' right') . '><a href='.get_permalink($r->ID).'>'.'<div class=page-related-title>'.$r->post_title.'</div>'.get_the_post_thumbnail($r->ID, array(50,50)).'</a></div>'; 
     } 
    ?>

这样的事情。我的建议是尝试使用花括号代替foreach（）：endforeach;

答

你的意思是：

 

$i = 0; 
    foreach ($rel as $r) : 
     $class = (($i % 2) == 0) ? "your_class" : ""; 
      echo '<div class="related-item $class"><a href='.get_permalink($r->ID).'>'.'<div class=page-related-title>'.$r->post_title.''.get_the_post_thumbnail($r->ID, array(50,50)).'</a></div>'; 
     $i++; 
    endforeach;

答

如果阵列有一个序列索引，你可以使用一个模运算或按位运算。如果该数组基于非数字或未排序的数字，则需要添加一个计数器。

$i & 1 // odd using bitwise 

$i % 2 // odd modulo

那么，你会得到如下：

$i = 0; 
foreach ($rel as $r) { // note that I have used curly brackets. I think it is cleaner more standard 
    $i++; 
    $classes = array('related-item'); 
    if ($i % 2 == 0) $classes[] = 'right'; 

    echo '<div class="'.implode(' ', $classes).'"><a href='.get_permalink($r->ID).'>'.'<div class=page-related-title>'.$r->post_title.'</div>'.get_the_post_thumbnail($r->ID, array(50,50)).'</a></div>'; 
}

或者使用逐：

$i = 0; 
foreach ($rel as $r) { // note that I have used curly brackets. I think it is cleaner more standard 
    $i++; 
    $classes = array('related-item'); 
    if ($i & 2 == 0) $classes[] = 'right'; 

    echo '<div class="'.implode(' ', $classes).'"><a href='.get_permalink($r->ID).'>'.'<div class=page-related-title>'.$r->post_title.'</div>'.get_the_post_thumbnail($r->ID, array(50,50)).'</a></div>'; 
}

或者，如果$rel具有零基于序列索引：

foreach ($rel as $index => $r) { // note that I have used curly brackets. I think it is cleaner more standard 
    $classes = array('related-item'); 
    if ($index & 2 == 1) $classes[] = 'right'; 

    echo '<div class="'.implode(' ', $classes).'"><a href='.get_permalink($r->ID).'>'.'<div class=page-related-title>'.$r->post_title.'</div>'.get_the_post_thumbnail($r->ID, array(50,50)).'</a></div>'; 
}

答

<?php 
foreach($rel as $key => $r) { 
    /* here we check if $key is even and assign class name or empty string to $class variable */ 
    ($key%2) ? $class = 'your-class-name' : $class = ''; 

    /* and here we just add $class variable to 'class="related-items " part. */ 
    /* so if $key is odd then $class will be empt and your div will have only 'related-item' class, and if $key is even then $class will hold 'your-class-name' value and div will have two classes: related-item and your-class-name */ 
    echo '<div class="related-item '.$class.'"><a href='.get_permalink($r->ID).'>'.'<div class=page-related-title>'.$r->post_title.'</div>'.get_the_post_thumbnail($r->ID, array(50,50)).'</a></div>'; 
} 
?>

在一个foreach字符串中添加一个css类

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