嗨,我根据我在网上找到的函数创建了这个函数,并尝试为我的PHP页面修改它,以便上传他们的图标,但我想限制用户上传只能为100x100px大小的图像。我只是用这个来称呼它:
uploadImage($id,$_FILES['upload']['name'],$_FILES['upload']['tmp_name']);
这是我做的功能:
function uploadImage($new_name,$imagename,$tmp_name){
if($tmp_name!=null||$tmp_name!=""){
list($width, $height, $type, $attr) = getimagesize($tmp_name);
if($width==100&&$height==100){
$image1 = $imagename;
$extension = substr($image1, strrpos($image1, '.') + 1);
$image = "$new_name.$extension";
$folder = "Images/";
if($image) {
$filename = $folder.$image;
$copied = copy($tmp_name, $filename);
}
else echo "image not uploaded.";
}
else
echo "upload only 100x100px image!";
}
}
现在的问题是,即使我上传了一个超过100 x 100px尺寸的图像,它仍然不会返回任何错误,现在我已经迷失了方向
您可能需要重新考虑您的代码;有一个功能可以检查上传的图像是否有效,然后实际进行上传。或者,您可以创建一个类。
<?php
class ImageUpload
{
public $tmpImage;
public $maxWidth = 100;
public $maxHeight = 100;
public $errors = [];
public function __construct($image)
{
$this->tmpImage = $image;
}
public function upload()
{
// Check image is valid; if not throw exception
// Check image is within desired dimensions
list($width, $height) = getimagesize($this->tmpImage);
if ($width > $this->maxWidth || $height > $this->maxHeight) {
throw new Exception(sprintf('Your image exceeded the maximum dimensions (%d×%d)', $this->maxWidth, $this->maxHeight));
}
// Create filename
// Do the upload logic, i.e. move_uploaded_file()
}
}
然后,您可以按如下方式使用此类:
<?php
$imageUpload = new ImageUpload($_FILES['upload']['tmp_name']);
try {
$imageUpload->upload();
} catch (Exception $e) {
echo 'An error occurred: ' . $e->getMessage();
}
这是即兴写的,所以它们可能是错误的。但希望它能展示一种更好的方法来处理文件上传,以及上传过程中可能出现的错误。
好吧,您也可以在上传后调整图像的大小。
function createFixSizeImage( $pathToImages, $pathToFixSizeImages, $Width )
{
// open the directory
$dir = opendir( $pathToImages );
// loop through it, looking for any/all JPG files:
while (false !== ($fname = readdir( $dir ))) {
$image_info = getimagesize( "path/to/images/".$fname );
$image_width = $image_info[0];
$image_height = $image_info[1];
$image_type = $image_info[2];
switch ( $image_type )
{
case IMAGETYPE_JPEG:
// parse path for the extension
$info = pathinfo($pathToImages . $fname);
// continue only if this is a JPEG image
if ( strtolower($info['extension']) == 'jpeg' )
{
// load image and get image size
$img = imagecreatefromjpeg( "{$pathToImages}{$fname}" );
$width = imagesx( $img );
$height = imagesy( $img );
// give the size,u want
$new_width = 100;
$new_height = 100;
// create a new temporary image
$tmp_img = imagecreatetruecolor( $new_width, $new_height );
// copy and resize old image into new image
imagecopyresized( $tmp_img, $img, 0, 0, 0, 0, $new_width, $new_height, $width, $height );
// save Fix Size Images into a file
imagejpeg( $tmp_img, "{$pathToFixSizeImages}{$fname}" );
}
break;
case IMAGETYPE_PNG:
// parse path for the extension
$info = pathinfo($pathToImages . $fname);
// continue only if this is a JPEG image
if ( strtolower($info['extension']) == 'png' )
{
// load image and get image size
$img = imagecreatefrompng( "{$pathToImages}{$fname}" );
$width = imagesx( $img );
$height = imagesy( $img );
$new_width = 100;
$new_height = 100;
// create a new temporary image
$tmp_img = imagecreatetruecolor( $new_width, $new_height );
// copy and resize old image into new image
imagecopyresized( $tmp_img, $img, 0, 0, 0, 0, $new_width, $new_height, $width, $height );
// save Fix Size Images into a file
imagejpeg( $tmp_img, "{$pathToFixSizeImages}{$fname}" );
}
break;
case IMAGETYPE_BMP:
echo "bmp";
break;
default:
break;
}
}
}
// close the directory
closedir( $dir );
}
createFixSizeImage("path","path/to/images/to/be/saved",100);
扩展或多或少未知的代码,然后对其进行调试,就像几周前写了一些代码,但现在已经不懂了。
在您的案例中,您正在通过添加检查图像大小的功能来扩展一些现有代码(您没有发布原始代码,但您写道您是这样做的)。
这样你就不需要编辑很多(未知但有效的)代码,创建新功能作为它自己的功能:
/**
* @param string $file
* @param int $with
* @param int $height
* @return bool|null true/false if image has that exact size, null on error.
*/
function image_has_size($file, $width, $height)
{
$result = getimagesize($file);
if ($count($result) < 2) {
return null;
}
list($file_width, $file_height) = $result;
return ($file_width == (int) $width)
&& ($file_height == (int) $height);
}
现在,您在一个函数中拥有了新的功能,您可以更容易地将其集成到原始代码中(希望能以其他方式工作)。
用法:
$imageHasCorrectSize = image_has_size($tmp_name, 100, 100);
所以,每当你更改代码时,都要像外科医生一样,尽可能地缩小切口。