Question

我想调整用户上传到我们服务器的图片的大小。我希望它是200x200像素。目前，这是我正在使用的代码。它上传很好，但它没有将图像大小调整为200x200。或者有没有办法缩小文件大小？

// make a note of the current working directory, relative to root.
$directory_self = str_replace(basename($_SERVER['PHP_SELF']), '', $_SERVER['PHP_SELF']);

// make a note of the directory that will recieve the uploaded files
$uploadsDirectory = $_SERVER['DOCUMENT_ROOT'] . $directory_self . 'uploaded_files/';

// make a note of the location of the upload form in case we need it
$uploadForm = 'http://' . $_SERVER['HTTP_HOST'] . $directory_self . 'upload.form.php';

// make a note of the location of the success page
$uploadSuccess = 'http://' . $_SERVER['HTTP_HOST'] . $directory_self .     'upload.success.php';

// name of the fieldname used for the file in the HTML form
$fieldname = 'file';


// Now let's deal with the upload

// possible PHP upload errors
$errors = array(1 => 'php.ini max file size exceeded', 
            2 => 'html form max file size exceeded', 
            3 => 'file upload was only partial', 
            4 => 'no file was attached');

// check the upload form was actually submitted else print form
isset($_POST['submit'])
or error('the upload form is neaded', $uploadForm);

// check for standard uploading errors
($_FILES[$fieldname]['error'] == 0)
or error($errors[$_FILES[$fieldname]['error']], $uploadForm);

// check that the file we are working on really was an HTTP upload
@is_uploaded_file($_FILES[$fieldname]['tmp_name'])
or error('not an HTTP upload', $uploadForm);

// validation... since this is an image upload script we 
// should run a check to make sure the upload is an image
@getimagesize($_FILES[$fieldname]['tmp_name'])
or error('only image uploads are allowed', $uploadForm);

// make a unique filename for the uploaded file and check it is 
// not taken... if it is keep trying until we find a vacant one
//$now = time();

while(file_exists($uploadFilename = $uploadsDirectory.$fb_id.'-'.$_FILES[$fieldname]    ['name']))
{
//$now++;
}

// now let's move the file to its final and allocate it with the new filename
@move_uploaded_file($_FILES[$fieldname]['tmp_name'], $uploadFilename)
or error('receiving directory insuffiecient permission', $uploadForm);

Answer 1

永远不要缩小文件，否则会对图片造成不必要的损坏。而是尝试使用图像函数（例如gd image functons）使用新的缩放尺寸重新创建图像。它提供了重新创建和调整大小所需的一切。此外，您也可以使用Imagick Library，它具有更多高级功能。

当你找到合适的工作时，也可以尝试接受答案，如果你的录取率足够公平，它会让人们回答你更多的问题。

调整上传的图像文件php

1 个答案: