如何为所有类别重复循环

Question

我在 PHP 中有一个循环并没有真正像我想要的那样结束，因为我没有使用 PHP 并且无法弄清楚。我想重复一个循环来显示每个类别的每个帖子，这些帖子都有名为“tblcategories”和“tblposts”的表格。我想每行做 2 个类别，每个类别有 2 个帖子，但我什至没有设法做超过一个类别。这是更新后的代码：

 <?php   
       $no_of_records_per_page = 2;
       $selectcat = "SELECT * FROM tblcategory"; //get all categories
       $stmt = $con->prepare($selectcat); 
       $stmt->execute();
       $result = $stmt->get_result();
       $counter = 0;
       while ($row = mysqli_fetch_array($result)) { //loop all category. here row is single category
           $query="select tblposts.id as pid,tblposts.PostTitle as posttitle,tblposts.PostImage,tblcategory.CategoryName as category,tblcategory.id as cid,tblsubcategory.Subcategory as subcategory,tblposts.PostDetails as postdetails,tblposts.PostingDate as postingdate,tblposts.PostUrl as url from tblposts left join tblcategory on tblcategory.id=tblposts.CategoryId left join  tblsubcategory on  tblsubcategory.SubCategoryId=tblposts.SubCategoryId where tblposts.Is_Active=1 and tblposts.CategoryId=? order by tblposts.id desc  LIMIT ?";
           $stmt = $con->prepare($query); 
           $stmt->bind_param("ii", $row['id'], $no_of_records_per_page);
           $stmt->execute();
           $resultt = $stmt->get_result();
           
           if ($counter % 2 == 0) echo "<div class='row'>"; //here we open row for each even category, so 0, 2, 4,...
           else $counter++;
       
           
           echo "<div class='col-md-5'>";
       
           while ($row1 = mysqli_fetch_array($resultt)) {
               echo "<div class='col-md-12'>"; ?>

<h2 style="text-align:center;" ><a href="category.php?catid=<?php echo htmlentities($row1['cid'])?>"><?php echo htmlentities($row1['category']);?></a></h2>
                <hr> 
                    
                <div class="post-preview"><a href="news-details.php?nid=<?php echo htmlentities($row1['pid'])?>">
                        <img class="post-title" src="admin/postimages/<?php echo htmlentities($row1['PostImage']);?>" alt="<?php echo htmlentities($row1['posttitle']);?>" style="width:250px; height:auto; box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);">
                        <h2 style="font-size:20pt;" class="post-title"><?php echo htmlentities($row1['posttitle']);?></h2>
                        
                    </a>
                    <p class="post-meta"><b>Category : </b> <a href="category.php?catid=<?php echo htmlentities($row1['cid'])?>"><?php echo htmlentities($row1['category']);?></a> <br><?php echo htmlentities($row1['postingdate']);?></a></p>
                </div>
                <hr>

       <?php
               // show here post from $row1
       
               echo "</div>";
           }
           echo "</div>";
           if ($counter % 2 == 1) echo "</div>"; //here we close row for category so, 1, 3, 5,...
       }
        ?>       

Answer 1

我不能完全理解你，但我认为你必须先选择所有类别，然后使用 while 循环你必须选择它的帖子。

你的html结构应该是这样的

像这样：

$no_of_records_per_page = 2;
$selectcat = "SELECT * FROM tblcategory"; //get all categories
$stmt = $con->prepare($selectcat); 
$stmt->execute();
$result = $stmt->get_result();
$counter = 0;
while ($row = mysqli_fetch_array($result)) { //loop all category. here row is single category
    $query="select tblposts.id as pid,tblposts.PostTitle as posttitle,tblposts.PostImage,tblcategory.CategoryName as category,tblcategory.id as cid,tblsubcategory.Subcategory as subcategory,tblposts.PostDetails as postdetails,tblposts.PostingDate as postingdate,tblposts.PostUrl as url from tblposts left join tblcategory on tblcategory.id=tblposts.CategoryId left join  tblsubcategory on  tblsubcategory.SubCategoryId=tblposts.SubCategoryId where tblposts.Is_Active=1 and tblposts.CategoryId=? order by tblposts.id desc  LIMIT ?";
    $stmt = $con->prepare($query); 
    $stmt->bind_param("ii", $row['id'], $no_of_records_per_page);
    $stmt->execute();
    $resultt = $stmt->get_result();
    
    if ($counter % 2 == 0) echo "<div class='row'>"; //here we open row for each even category, so 0, 2, 4,...
    else $counter++;

    
    echo "<div class='col-md-5'>"; //open col for row posts category title will be inside col-5

    while ($row1 = mysqli_fetch_array($resultt)) {
        echo "<div class='col-md-12'>";

        // show here post from $row1

        echo "</div>";
    }
    echo "</div>"; // close col-5
    if ($counter % 2 == 1) echo "</div>"; //here we close row for category so after two col-5 row will be close
}