Question

我正在使用以下代码以网格方式显示数据库中的图像。此代码工作正常并显示图像。但如果row[img]是“pdf”文件，我想显示默认图像。哪里错了？任何指导将受到高度赞赏。

    <?php
    include("config.inc.php"); //include config file
    //sanitize post value
    $page_number = filter_var($_POST["page"], FILTER_SANITIZE_NUMBER_INT, FILTER_FLAG_STRIP_HIGH);

    //throw HTTP error if page number is not valid
    if(!is_numeric($page_number)){
        header('HTTP/1.1 500 Invalid page number!');
        exit();
    }

    //get current starting point of records
    $position = ($page_number * $item_per_page);

    //Limit our results within a specified range. 
    $results = mysqli_query($connecDB,"SELECT id,name,comment,datetime,img,reply FROM table ORDER BY date DESC LIMIT $position, $item_per_page");


    //output results from database
$ext=".pdf";


//output results from database


function endsWith($img, $ext){
    $extLength = strlen($ext);
    if(substr($img, -extLength) == $ext){
return true;
    }
   return false;
} 


while ($row = mysqli_fetch_assoc($results))
{

    //get data
    echo '<article class="white-panel">';



$id = $row['id'];
    $comment = $row['comment'];
    $datetime = $row['datetime'];
    $name = $row['name'];
    $img = $row['img'];
If(endsWith($row['img'], ".pdf")){ //executes if return is true        
    echo '<img src="http://myownwebsite.com/image.png" /></a><p>';
    }
    else
    {
    echo '<img src="http://myownwebiste.com/upload/' .  $row['img'] . '" /></a><p>';
    }
    echo "</article>";
    ?>

我现在更新的代码但没有工作。

根据您的更新，我目前的多项选择代码如下

    <?php
    include("config.inc.php"); //include config file
    //sanitize post value
    $page_number = filter_var($_POST["page"], FILTER_SANITIZE_NUMBER_INT, FILTER_FLAG_STRIP_HIGH);

    //throw HTTP error if page number is not valid
    if(!is_numeric($page_number)){
        header('HTTP/1.1 500 Invalid page number!');
        exit();
    }

    //get current starting point of records
    $position = ($page_number * $item_per_page);

    //Limit our results within a specified range. 
    $results = mysqli_query($connecDB,"SELECT id,name,comment,datetime,img,reply FROM table ORDER BY date DESC LIMIT $position, $item_per_page");


    //output results from database
$ext=".pdf";


//output results from database


while ($row = mysqli_fetch_assoc($results))
{

    //get data
    echo '<article class="white-panel">';



$id = $row['id'];
    $comment = $row['comment'];
    $datetime = $row['datetime'];
    $name = $row['name'];
    $img = $row['img'];

switch(substr($img, -$extLength))
{
  case ".pdf":
echo '<img src="http://myownsite.com/upload/imagepdf.png" /></a><p>';
   break;
  case ".mp4":
echo '<img src="http://myownsite.com/upload/imagemp4.png" /></a><p>';
   break;
default:
echo '<img src="http://myownsite.com/upload/' .  $row['img'] . '" /></a><p>';
   break;
}



echo "</article>";
?>

Answer 1

如果匹配则返回最后4个字符串（.pdf），返回true然后执行，否则执行

 $ext=".pdf";

function endsWith($img, $ext){
    $extLength = strlen($ext);
    if(substr($img, -$extLength) == $ext){
        return true;
    }
    return false;
} 
If(endsWith($row['img'], ".pdf")){ //executes if return is true

echo '<img src="http://example.com/image.png" /></a><p>';
}
else
{   //executes if return is false
echo '<img src="http://example.com/upload/' .  $row['img'] . '" /></a><p>';

}

用于不同分机的多个图像

$extLength=4;//most of extensions are 3 character + 1 for '.'
switch(substr($img, -$extLength))
{
  case ".pdf":
   echo "pdf.jpg";
   break;
  case ".mp4":
   echo "mp4.jpg";
   break;

  default://for jpg i.e present
   echo "http://eg.com/$row[img]";
   break;


}

检查行值是否为pdf文件而不是显示默认图像

1 个答案: