一起上传图像和缩略图，但未生成缩略图

Question

我正在尝试向我的现有代码中添加一种方法，以从正在上传的全尺寸图像生成缩略图。我在这里做了一些搜索，找到了一个函数来完成我正在寻找的东西，但没有生成我的缩略图。我设置它的方式是将全尺寸图像转到 images/lg/ 文件夹，缩略图将转到 images 文件夹。但是，只有大图像会进入各自的文件夹，而不会生成缩略图。

<?php 
include_once 'includes/dbh.inc.php';
function make_thumb($src, $dest, $desired_width) {

    /* read the source image */
    $source_image = imagecreatefromjpeg($src);
    $width = imagesx($source_image);
    $height = imagesy($source_image);

    /* find the "desired height" of this thumbnail, relative to the desired width  */
    $desired_height = floor($height * ($desired_width / $width));

    /* create a new, "virtual" image */
    $virtual_image = imagecreatetruecolor($desired_width, $desired_height);

    /* copy source image at a resized size */
    imagecopyresampled($virtual_image, $source_image, 0, 0, 0, 0, $desired_width, $desired_height, $width, $height);

    /* create the physical thumbnail image to its destination */
    imagejpeg($virtual_image, $dest);
}
if (isset($_GET['id'])){
if (isset($_POST['submit'])) {
    $file = $_FILES['file'];

    $fileName = $_FILES['file']['name'];
    $fileType = $_FILES['file']['type'];
    $fileTmpName = $_FILES['file']['tmp_name'];
    $fileSize = $_FILES['file']['size'];
    $fileError = $_FILES['file']['error'];

    $fileExt = explode('.', $fileName);
    $fileActualExt = strtolower(end($fileExt));

    $allowed = array('jpg', 'jpeg', 'png');
    if (in_array($fileActualExt, $allowed))
        if($fileError === 0){
            if ($fileSize < 5000000) {
                $fileNameNew = "car".$_GET['id'].".".$fileActualExt;
                $fileDestination = 'images/lg/'.$fileNameNew;
                move_uploaded_file($fileTmpName, $fileDestination); //files going to the 'images/lg' folder
                $sql = "UPDATE rollingstock SET stockImgStatus=? WHERE stockID=?";
                $stmt = $mysqli->prepare($sql);
                $stockImgStatus = 1;
                if (file_exists($fileDestination)) { /*if the file exisits make a thumbnail */
                $src = $fileDestination;
                $dest = 'images/'.$fileNameNew;
                $desired_width = "395"; 
                make_thumb($src, $dest, $desired_width); //Thumbnails going to the 'imgages' folder
                }
                if ($stmt &&
                    $stmt -> bind_param('ii', $stockImgStatus, $_GET['id'])&&
                    $stmt -> execute()&&
                    $stmt -> affected_rows === 1
                ) {
                    header("Location: list.php?list=all"); 
                }else{
                    echo "Not Updated";
                }
                
            }else {
                echo "Your file is too big!";
            }
        }else{
            echo "There was an error uploading for file!";
        }
}else{
    echo "You cannot upload files of this type!";
}
}

Answer 1

我可以使用提供的代码生成大图像和缩略图。请检查您的图片文件夹是否有写入权限。

Answer 2

我检查了你的代码，总体来说没问题。 make_thumb() 函数中只有一个小错误，您在其中使用了 imagecreatefromjpeg()，它适用于 .jpeg 和 .jpg 图像类型，但不适用于您也接受的 .png 图像。

您可以简单地在 make_thumb() 函数中添加一个检查来检查文件类型并调用适当的方法，就像提到的 in this post.

我还从链接 post:

添加了一个修改过的片段

switch ( strtolower( pathinfo( $src, PATHINFO_EXTENSION ))) {
        case 'jpeg':
        case 'jpg':
            $source_image = imagecreatefromjpeg($src);
        break;

        case 'png':
            $source_image = imagecreatefrompng($src);
        break;

        case 'gif':
            $source_image = imagecreatefromgif($src);
        break;

        default:
            throw new InvalidArgumentException('File "'.$src.'" is not valid jpg, png image.');
        break;
    }

一起上传图像和缩略图，但未生成缩略图

Uploading image and thumbnail together but the thumbnail is not generating

php

file-upload