Question

我如何组织php foreach？我已经尝试了5天，但仍然无法使其工作我不知道php foreach它是如何工作的，但我正在学习它，感谢大家的建议

原始php：

<?php if(isset($this->leading) && count($this->leading)): ?>
        <?php foreach($this->leading as $key=>$item): ?>
            <?php

                $this->item=$item;
                echo $this->loadTemplate('item');
            ?>
        <?php endforeach; ?>
    <?php endif; ?>


    <?php if(isset($this->primary) && count($this->primary)): ?>
        <?php foreach($this->primary as $key=>$item): ?>
            <?php

                $this->item=$item;
                echo $this->loadTemplate('item');
            ?>
        <?php endforeach; ?>
    <?php endif; ?>


    <?php if(isset($this->secondary) && count($this->secondary)): ?>
        <?php foreach($this->secondary as $key=>$item): ?>          
            <?php

                $this->item=$item;
                echo $this->loadTemplate('item');
            ?>
        <?php endforeach; ?>
    <?php endif; ?>

我试过

<?php if(isset($this->leading) && count($this->leading)) && (isset($this->primary) && count($this->primary)) && (isset($this->secondary) && count($this->secondary)): ?>
    <!-- Leading items -->
        <?php foreach (array($this->leading, $this->primary, $this->secondary) as $key=>$item)          ($this->leading as $key=>$item): ?>
            <?php
                // Load category_item.php by default
                $this->item=$item;
                echo $this->loadTemplate('item');
            ?>
        <?php endforeach; ?>
    <?php endif; ?>

但没有工作

一如既往，感谢您的协助！

谢谢！每个人：）

谢谢，史蒂芬！

Answer 1

你的意思是这样的......？

<?php

$arr = array();
$arr[] = $this->leading;
$arr[] = $this->primary;
$arr[] = $this->secondary;

foreach($arr as $v) {    
    if(is_array($v) && (count($v) > 0)) {
        foreach($v as $item) {
            $this->item=$item;
            echo $this->loadTemplate('item');
        }
    }
}

?>

Answer 2

定义如下函数：

function foobar ($tmp) {
    if(isset($tmp) && count($tmp)) { 
        foreach ($tmp as $key => $item) {
            // Load category_item.php by default
            $this->item = $item;
            echo $this->loadTemplate('item');
        }
    }   
}

并使用您的数据调用它：

foobar($this->leading);
foobar($this->primary);
foobar($this->secondary);

Answer 3

处理此问题的最简单方法是首先构建一个包含所需项目的列表，然后只使用一个foreach循环遍历该列表。

我还建议在是否定义三个变量（前导，主要，次要）方面有所建议。如果你可以保证它们已被设置并且是数组 - 即使它们是空数组，它也可以使你的代码变得如此简单：

<?php
$items = array_merge($this->leading, $this->primary, $this->secondary);
foreach ($items as $Item) {
    $this->item = $item;
    $this->loadTemplate('item');
}
?>

如果您真的不知道变量是否已设置，并且您无法在其他位置重构代码以进行更改，则可以执行以下操作：

<?php
$items = array();
if (isset($this->leading)) $items = array_merge($items, $this->leading);
if (isset($this->primary)) $items = array_merge($items, $this->primary);
if (isset($this->secondary)) $items = array_merge($items, $this->secondary);
foreach ($items as $Item) {
    $this->item = $item;
    $this->loadTemplate('item');
}
?>

group php foreach loop（已关闭）

3 个答案: