我们的服务器正在将 EXIF 数据保存到使用imagejpeg()
. 据我所知,这不是默认行为(甚至可能,从我读过的内容来看)。但是,它正在发生,并且由于FileDateTime
包含的信息(并使用time
保存),它破坏了我们上传/批准系统中的功能(由于总是不同md5_file()
,为完全相同的图像返回不同的值)。FileDateTime
有没有办法防止imagejpeg()
默认保存图像的 EXIF 数据?
服务器信息
- CentOS 5
- Parallels Plesk 面板 10.4.4
- GD 版本:捆绑(2.0.34 兼容)
- PHP 5.3
代码
<?php
public function upload_book_cover($book, $cover, $filename = NULL, $approved = NULL){
global $c_consummo, $user;
$approved = bool($approved, true, true);
if(filesize($cover)>5242880){
return false; // Too large;
}
$max_width = 450;
$cover_info = getimagesize($cover);
if(!$this->is_valid_book_cover_type($cover_info['mime'])){
return false; // Invalid image type
}
$width = $cover_info[0];
$height = $cover_info[1];
if($width<200){
return false; // Too small
} elseif($width>1500){
return false; // Too wide
}
$original_cover = false;
switch($cover_info[2]){
case IMAGETYPE_GIF:
$original_cover = imagecreatefromgif($cover);
break;
case IMAGETYPE_JPEG:
$original_cover = imagecreatefromjpeg($cover);
break;
case IMAGETYPE_PNG:
$original_cover = imagecreatefrompng($cover);
break;
case IMAGETYPE_BMP:
$original_cover = imagecreatefrombmp($cover);
break;
}
if(!$original_cover){
return false; // Unsupported type
}
if($width>$max_width){
$new_width = $max_width;
} else {
$new_width = $width;
}
$new_height = round($height*($new_width/$width));
$new_cover = imagecreatetruecolor($new_width, $new_height);
if(!$new_cover){
return false; // Could not create true color image
}
if(!imagecopyresampled($new_cover, $original_cover, 0, 0, 0, 0, $new_width, $new_height, $width, $height)){
return false; // Could not copy image
}
if(!imagejpeg($new_cover, $cover, 100)){
return false; // Image could not be saved to tmp file
// This is adding *new* EXIF data to images by itself
}
$file_hash = md5_file($cover);
$duplicate_book_cover = $this->find_duplicate_book_cover($book, $file_hash);
if($duplicate_book_cover){
return $duplicate_book_cover;
}
$file_id = $c_consummo->upload_file($cover, $filename);
...
}