最后，我发现了一种适合我需求的方法。以下代码段会将图像调整为指定的宽度，并自动计算高度以保持比例。
$image = $_FILES["image"]["tmp_name"];$resizedDestination = $uploadDirectory.md5($randomNumber.$filename)."_RESIZED.jpg";copy($_FILES, $resizedDestination);$imageSize = getImageSize($image);$imageWidth = $imageSize[0];$imageHeight = $imageSize[1];$DESIRED_WIDTH = 100;$proportionalHeight = round(($DESIRED_WIDTH * $imageHeight) / $imageWidth);$originalImage = imageCreateFromJPEG($image);$resizedImage = imageCreateTrueColor($DESIRED_WIDTH, $proportionalHeight);imageCopyResampled($images_fin, $originalImage, 0, 0, 0, 0, $DESIRED_WIDTH+1, $proportionalHeight+1, $imageWidth, $imageHeight);imageJPEG($resizedImage, $resizedDestination);imageDestroy($originalImage);imageDestroy($resizedImage);
对于寻求完整示例的其他任何人，请创建两个文件：
<!-- send.html --><html><head> <title>Simple File Upload</title></head><body> <center> <div > Select an image. <br/> <br/> <form action="receive.php" enctype="multipart/form-data" method="post"> <input type="file" name="image" size="40"> <input type="submit" value="Send"> </form> </div> </center></body><?php// receive.php$randomNumber = rand(0, 99999);$uploadDirectory = "images/";$filename = basename($_FILES['file_contents']['name']);$destination = $uploadDirectory.md5($randomNumber.$filename).".jpg";echo "File path:".$filePath."<br/>";if (is_uploaded_file($_FILES["image"]["tmp_name"]) == true) { echo "File successfully received through HTTP POST.<br/>"; // Validate the file size, accept files under 5 MB (~5e+6 bytes). if ($_FILES['image']['size'] <= 5000000) { echo "File size: ".$_FILES["image"]["size"]." bytes.<br/>"; // Resize and save the image. $image = $_FILES["image"]["tmp_name"]; $resizedDestination = $uploadDirectory.md5($randomNumber.$filename)."_RESIZED.jpg"; copy($_FILES, $resizedDestination); $imageSize = getImageSize($image); $imageWidth = $imageSize[0]; $imageHeight = $imageSize[1]; $DESIRED_WIDTH = 100; $proportionalHeight = round(($DESIRED_WIDTH * $imageHeight) / $imageWidth); $originalImage = imageCreateFromJPEG($image); $resizedImage = imageCreateTrueColor($DESIRED_WIDTH, $proportionalHeight); imageCopyResampled($images_fin, $originalImage, 0, 0, 0, 0, $DESIRED_WIDTH+1, $proportionalHeight+1, $imageWidth, $imageHeight); imageJPEG($resizedImage, $resizedDestination); imageDestroy($originalImage); imageDestroy($resizedImage); // Save the original image. if (move_uploaded_file($_FILES['image']['tmp_name'], $destination) == true) { echo "Copied the original file to the specified destination.<br/>"; } }}?>
