使 if in PHP 无穷大

Question

我需要一些有关 php 代码的帮助。我的 controller/product/product.php (opencart 1.5.6):

中有这段代码

            $rsNext     = $this->model_catalog_product->getProduct($product_id+1);
            $rsNext2    = $this->model_catalog_product->getProduct($product_id+2);
            $rsNext3    = $this->model_catalog_product->getProduct($product_id+3);
            $rsLast     = $this->model_catalog_product->getProduct($product_id-1);
            $rsLast2    = $this->model_catalog_product->getProduct($product_id-2);
            $rsLast3    = $this->model_catalog_product->getProduct($product_id-3);
            if($rsNext):
                $this->data['next_url'] = $this->url->link('product/product', 'product_id=' .  $rsNext['product_id']);
                $this->data['next_text']= $rsNext['name']." &gt;&gt;";

            elseif($rsNext2):
                $this->data['next_url'] = $this->url->link('product/product', 'product_id=' .  $rsNext2['product_id']);
                $this->data['next_text']= $rsNext2['name']." &gt;&gt;";

            elseif($rsNext3):
                $this->data['next_url'] = $this->url->link('product/product', 'product_id=' .  $rsNext3['product_id']);
                $this->data['next_text']= $rsNext3['name']." &gt;&gt;";
            else:
                $this->data['next_url'] = '';
                $this->data['next_text']= '';
            endif;

            if($rsLast):
                $this->data['prev_url'] = $this->url->link('product/product', 'product_id=' .  $rsLast['product_id']);
                $this->data['prev_text']= "&lt;&lt; ".$rsLast['name'];

            elseif($rsLast2):
                $this->data['prev_url'] = $this->url->link('product/product', 'product_id=' .  $rsLast2['product_id']);
                $this->data['prev_text']= "&lt;&lt; ".$rsLast2['name'];

            elseif($rsLast3):
                $this->data['prev_url'] = $this->url->link('product/product', 'product_id=' .  $rsLast3['product_id']);
                $this->data['prev_text']= "&lt;&lt; ".$rsLast3['name'];
            else:
                $this->data['prev_url'] = '';
                $this->data['prev_text']= null;
            endif;

我怎么能让这个无限大，因为在某些情况下需要 product_id+15 或更多。谢谢！

Answer 1

假设$product_id是一个整数，你可以这样循环：

$from = $product_id -10;
$to = $product_id + 10;

for($i = $from; $i<$to; $i++){
  echo $i;
}

会不会影响加载速度，是的。如果你问多少，最少。也许几微秒。需要更多示例吗？看看这个非常容易构造的 Google 查询。

Answer 2

使用 foreach 创建一个循环

在 foreach 循环中使用 if 的基本示例

$number = array(1, 2, 3, 4, 5, 6, 7, 8, 9);
echo '<ul>';
foreach($number as $num){
    if($num > 5){
        echo '<li>Greater than - '.$num.'</li>';
    }else{
        echo '<li>less than - '.$num.'</li>';
    }
}
echo '</ul>';

使 if in PHP 无穷大

Make if in PHP infinite

php

controller

opencart