根据图像的长宽比创建缩略图，同时使用php上传图像

Question

我想在上传图像时创建缩略图，我已经创建了上传脚本。

<?php 
if (isset($_POST['upload'])) { 
$target = "./img/".basename($_FILES['image']['name']); 

$image = $_FILES['image']['name']; 

$sql = "INSERT INTO `image`(`image`) VALUES ('$image')"; 
mysqli_query($connection, $sql); 

if (move_uploaded_file($_FILES['image']['tmp_name'], $target)) { 
$smsg = "Image Uploaded Successfuly"; 
}else { 
$fmsg = "An Error Occure During Upload"; 
} 

} 
?> 

和调整图像的脚本：

function resize($newHeight, $targetFile, $originalFile) { 

$info = getimagesize($originalFile); 
$mime = $info['mime']; 

switch ($mime) { 
     case 'image/jpeg': 
       $image_create_func = 'imagecreatefromjpeg'; 
       $image_save_func = 'imagejpeg'; 
       $new_image_ext = 'jpg'; 
       break; 

     case 'image/png': 
       $image_create_func = 'imagecreatefrompng'; 
       $image_save_func = 'imagepng'; 
       $new_image_ext = 'png'; 
       break; 

     case 'image/gif': 
       $image_create_func = 'imagecreatefromgif'; 
       $image_save_func = 'imagegif'; 
       $new_image_ext = 'gif'; 
       break; 

     default: 
       throw new Exception('Unknown image type.'); 
} 

$img = $image_create_func($originalFile); 
list($width, $height) = getimagesize($originalFile); 

$newWidth = ($width/$height) * $newHeight; 
$tmp = imagecreatetruecolor($newWidth, $newHeight); 
imagecopyresampled($tmp, $img, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height); 

if (file_exists($targetFile)) { 
     unlink($targetFile); 
} 
$image_save_func($tmp, "thumb/$targetFile.$new_image_ext"); 
} 

我加入两个这样的脚本

<?php 
if (isset($_POST['upload'])) { 
$target = "./img/".basename($_FILES['image']['name']); 

$image = $_FILES['image']['name']; 

$sql = "INSERT INTO `image`(`image`) VALUES ('$image')"; 
mysqli_query($connection, $sql); 

if (move_uploaded_file($_FILES['image']['tmp_name'], $target)) { 
$smsg = "Image Uploaded Successfuly"; 

resize(320, '$target', '$target');  //resize function 
}else { 
$fmsg = "An Error Occure During Upload"; 
} 

} 
?> 

，当我尝试加入两个脚本则图片上传，但缩略图不创建错误=否这样的文件或目录。

任何人都可以帮助我加入脚本并在上传图片时创建缩略图。

Answer 1

以下行的变量单引号没有被解析，该值实际上是解释为$target而不是预期的folder/filename.xxx：

resize(320, '$target', '$target'); 

要么你删除它们：

resize(320, $target, $target); 

或使用双引号。

resize(320, "$target", "$target"); 

请教关于字符串的http://php.net/manual/en/language.types.string.php。

使用PHP的错误报告，并确保路径是正确的，并且文件夹是可以写入适当的权限。

• http://php.net/manual/en/function.error-reporting.php