我正在使用Laravel框架和Intervention Image库来上传和处理我的页面上的图像。一切正常，直到我尝试更新从移动设备或相机拍摄的.jpg图像。这些图像的MIME类型为application/octet-stream而不是image/jpeg。当我尝试使用以下命令上传图像时：
Image::make($thumb)->resize($this->twidth, $this->theight)->save($this->destination."/".$filename);
我遇到错误：
Unable to read image from file
一种解决方案是将图像在MS Paint中打开并重新保存，这将更改MIME类型为'image/jpeg'，使其可以上传。但我想尽量避免采用这种方法。
编辑：
我试图通过此命令来修复它：
$img = imagecreatefromstring($thumb);
但它返回错误：imagecreatefromstring(): Empty string or invalid image
有没有办法处理这种类型的图片？
请检查php.ini中的upload_max_filesize。在我的情况下，这是原因。
$request->validate([
'image' => 'required',
]);
使用文件扩展名验证图像将如下所示
if (! in_array($request->file('image')->clientExtension(), ['jpg', 'jpeg', 'png'])) {
// not a valid image
}
你可以尝试将它转换成 Laravel
//The file post to the server
$image = $_FILES['imgfile'];
//array for type if octet
$MimeType = array(
'useNew' => false,
'type' => ''
);
if($image['type'] == "application/octet-stream"){
$imageMimeSize = getimagesize($img['tmp_name']); // get temporary file REAL info
$MimeType['type'] = $imageMimeSize['mime']; //set in our array the correct mime
$MimeType['useNew'] = true; //set to true for next if
}
//now check if we will use the MimeType or the one sent by browser
//$mimeCheck is the things you want to check. In my case i just wanted PNG or JPG
if($MimeType['useNew'] == true){ //if true, use MimeType to check file/image file
$mimeCheckType = ($MimeType['type'] != "image/png" && $MimeType['type'] != "image/jpeg" && $MimeType['type'] != "image/jpg") && $MimeType['type'] != "image/gif");
}else{ //if not using real mime, go with the one device sent to us or browser sent us
$mimeCheckType = ($img['type'] != "image/png" && $img['type'] != "image/jpeg" && $img['type'] != "image/jpg");
}
//returns error if image not png/jpg/jpeg/gif
if($mimeCheck){
//return some error
}
了解更多相关文档，请访问此链接：源文件
如果你想要极致体验，可以尝试将其格式化为 Laravel
<?php
// Retrieve JPEG width and height without downloading/reading entire image.
function getjpegsize($img_loc) {
$handle = fopen($img_loc, "rb") or die("Invalid file stream.");
$new_block = NULL;
if(!feof($handle)) {
$new_block = fread($handle, 32);
$i = 0;
if($new_block[$i]=="\xFF" && $new_block[$i+1]=="\xD8" && $new_block[$i+2]=="\xFF" && $new_block[$i+3]=="\xE0") {
$i += 4;
if($new_block[$i+2]=="\x4A" && $new_block[$i+3]=="\x46" && $new_block[$i+4]=="\x49" && $new_block[$i+5]=="\x46" && $new_block[$i+6]=="\x00") {
// Read block size and skip ahead to begin cycling through blocks in search of SOF marker
$block_size = unpack("H*", $new_block[$i] . $new_block[$i+1]);
$block_size = hexdec($block_size[1]);
while(!feof($handle)) {
$i += $block_size;
$new_block .= fread($handle, $block_size);
if($new_block[$i]=="\xFF") {
// New block detected, check for SOF marker
$sof_marker = array("\xC0", "\xC1", "\xC2", "\xC3", "\xC5", "\xC6", "\xC7", "\xC8", "\xC9", "\xCA", "\xCB", "\xCD", "\xCE", "\xCF");
if(in_array($new_block[$i+1], $sof_marker)) {
// SOF marker detected. Width and height information is contained in bytes 4-7 after this byte.
$size_data = $new_block[$i+2] . $new_block[$i+3] . $new_block[$i+4] . $new_block[$i+5] . $new_block[$i+6] . $new_block[$i+7] . $new_block[$i+8];
$unpacked = unpack("H*", $size_data);
$unpacked = $unpacked[1];
$height = hexdec($unpacked[6] . $unpacked[7] . $unpacked[8] . $unpacked[9]);
$width = hexdec($unpacked[10] . $unpacked[11] . $unpacked[12] . $unpacked[13]);
return array($width, $height);
} else {
// Skip block marker and read block size
$i += 2;
$block_size = unpack("H*", $new_block[$i] . $new_block[$i+1]);
$block_size = hexdec($block_size[1]);
}
} else {
return FALSE;
}
}
}
}
}
return FALSE;
}
?>
将图像转换为JPEG，请尝试以下方法：
<?php
// Access the $_FILES global variable for this specific file being uploaded
// and create local PHP variables from the $_FILES array of information
$fileName = $_FILES["uploaded_file"]["name"]; // The file name
$fileTmpLoc = $_FILES["uploaded_file"]["tmp_name"]; // File in the PHP tmp folder
$fileType = $_FILES["uploaded_file"]["type"]; // The type of file it is
$fileSize = $_FILES["uploaded_file"]["size"]; // File size in bytes
$fileErrorMsg = $_FILES["uploaded_file"]["error"]; // 0 for false... and 1 for true
$fileName = preg_replace('#[^a-z.0-9]#i', '', $fileName); // filter the $filename
$newExt = explode(".", $fileName); // Split file name into an array using the dot
$fileExt = end($newExt); // Now target the last array element to get the file extension
// START PHP Image Upload Error Handling --------------------------------
if (!$fileTmpLoc) { // if file not chosen
echo "ERROR: Please browse for a file before clicking the upload button.";
exit();
} else if($fileSize > 5242880) { // if file size is larger than 5 Megabytes
echo "ERROR: Your file was larger than 5 Megabytes in size.";
unlink($fileTmpLoc); // Remove the uploaded file from the PHP temp folder
exit();
} else if ($fileErrorMsg == 1) { // if file upload error key is equal to 1
echo "ERROR: An error occured while processing the file. Try again.";
exit();
}
// END PHP Image Upload Error Handling ----------------------------------
// Place it into your "uploads" folder mow using the move_uploaded_file() function
$moveResult = move_uploaded_file($fileTmpLoc, "uploads/$fileName");
// Check to make sure the move result is true before continuing
if ($moveResult != true) {
echo "ERROR: File not uploaded. Try again.";
exit();
}
// ---------- Start Universal Image Resizing Function --------
$target_file = "uploads/$fileName";
$resized_file = "uploads/resized_$fileName";
$wmax = 500;
$hmax = 500;
ak_img_resize($target_file, $resized_file, $wmax, $hmax, $fileExt);
// ----------- End Universal Image Resizing Function ----------
// ---------- Start Convert to JPG Function --------
if (strtolower($fileExt) != "jpg") {
$target_file = "uploads/resized_$fileName";
$new_jpg = "uploads/resized_".$newExt[0].".jpg";
ak_img_convert_to_jpg($target_file, $new_jpg, $fileExt);
}
// ----------- End Convert to JPG Function -----------
echo "The file named <strong>$fileName</strong> uploaded successfuly.<br /><br />";
echo "It is <strong>$fileSize</strong> bytes in size.<br /><br />";
echo "It is an <strong>$fileType</strong> type of file.<br /><br />";
echo "The file extension is <strong>$fileExt</strong><br /><br />";
echo "The Error Message output for this upload is: $fileErrorMsg";
?>
HTML
<div id="profilephoto" class="profilephoto" data-coupling="#content2"><img src="<?php echo $avatar ?>"></div>
<div id="content2" style="display: none;" class="uploadbutton" data-coupling="#content2">
<form id="imguploadin" method="POST" action="image_upload_script.php">
<label class="cabinet"> <i class="icon-upload-alt"></i> Choose Photo
<input type="file" name="uploaded_file" class="file" onchange="handleFiles(this.files)"/>
</label>
</form>
</div>
jQuery/JavaScript
function handleFiles(files) {
for (var i = 0; i < files.length; i++) {
var file = files[i];
var imageType = /image.*/;
if (!file.type.match(imageType)) {
continue;
}
var img = document.createElement("img");
img.classList.add("newphoto");
img.file = file;
profilephoto.appendChild(img);
var reader = new FileReader();
reader.onload = (function(aImg) { return function(e) { aImg.src = e.target.result; }; })(img);
reader.readAsDataURL(file);
var eventt = jQuery.Event("submit");
$("#imguploadin").trigger(eventt);
}
}
PHP（image_upload_script.php）
<?php
session_start();
// Access the $_FILES global variable for this specific file being uploaded
// and create local PHP variables from the $_FILES array of information
$username = $_SESSION["username"];
$fileName = $_FILES["uploaded_file"]["name"]; // The file name
$fileTmpLoc = $_FILES["uploaded_file"]["tmp_name"]; // File in the PHP tmp folder
$fileType = $_FILES["uploaded_file"]["type"]; // The type of file it is
$fileSize = $_FILES["uploaded_file"]["size"]; // File size in bytes
$fileErrorMsg = $_FILES["uploaded_file"]["error"]; // 0 for false... and 1 for true
$kaboom = explode(".", $fileName); // Split file name into an array using the dot
$fileExt = end($kaboom); // Now target the last array element to get the file extension
// START PHP Image Upload Error Handling --------------------------------------------------
if (!$fileTmpLoc) { // if file not chosen
echo "ERROR: Please browse for a file before clicking the upload button.";
exit();
} else if ($fileSize > 1242880) { // if file size is larger than 5 Megabytes
echo "ERROR: Your file was larger than 5 Megabytes in size.";
unlink($fileTmpLoc); // Remove the uploaded file from the PHP temp folder
exit();
} else if (!preg_match("/.(gif|jpg|png)$/i", $fileName)) {
// This condition is only if you wish to allow uploading of specific file types
echo "ERROR: Your image was not .gif, .jpg, or .png.";
unlink($fileTmpLoc); // Remove the uploaded file from the PHP temp folder
exit();
} else if ($fileErrorMsg == 1) { // if file upload error key is equal to 1
echo "ERROR: An error occured while processing the file. Try again.";
exit();
}
// END PHP Image Upload Error Handling ----------------------------------------------------
// Place it into your "uploads" folder mow using the move_uploaded_file() function
$moveResult = move_uploaded_file($fileTmpLoc, "images/users/$username.$fileExt");
// Check to make sure the move result is true before continuing
if (!$moveResult) {
echo "ERROR: File not uploaded. Try again.";
unlink($fileTmpLoc); // Remove the uploaded file from the PHP temp folder
exit();
}
// ---------- Include Adams Universal Image Resizing Function --------
include_once("ak_php_img_lib_1.0.php");
$target_file = "images/users/$username.$fileExt";
$resized_file = "images/users/resized_$username.$fileExt";
$wmax = 200;
$hmax = 150;
ak_img_resize($target_file, $resized_file, $wmax, $hmax, $fileExt);
$thumbnail = "images/users/thumb_$username.$fileExt";
$wthumb = 150;
$hthumb = 150;
ak_img_thumb($target_file, $thumbnail, $wthumb, $hthumb, $fileExt);
// ----------- Write Image File path to the server ---------------------------------
$sql_user = "myuser";
$sql_pass = "mypassword";
$sql_ip = "localhost";
$sql_DB = "mydb";
if ($moveResult != true)
echo("couldnt write file path to database due to unsuccesfull upload");
else {
$mysqli = new mysqli($sql_ip, $sql_user, $sql_pass, $sql_DB);
if ($stmt = $mysqli->prepare("UPDATE users SET avatar=? WHERE username=?")) {
$user = $_SESSION['username'];
$avatar = $resized_file;
$stmt->bind_param('ss', $avatar, $user);
$stmt->execute();
$stmt->close();
//header('location: profile.html');
return true;
}
$mysqli->close();
}
// ----------- End Adams Universal Image Resizing Function -----------
// Display things to the page so you can see what is happening for testing purposes
echo "The file named <strong>$username.$fileExt</strong> uploaded successfuly.<br /><br />";
echo "It is <strong>$fileSize</strong> bytes in size.<br /><br />";
echo "It is an <strong>$fileType</strong> type of file.<br /><br />";
echo "The file extension is <strong>$fileExt</strong><br /><br />";
echo "The Error Message output for this upload is: $fileErrorMsg";
?>
我会尝试关注您如何接收文件。首先尝试这种方式：
$data = file_get_contents($_FILES['myphoto']['tmp_name']);
$image = imagecreatefromstring( $data );
这是关于这个话题的回答。
Image::make(
imagecreatefromstring(
file_get_contents($_FILES['myphoto']['tmp_name'])
)
);
// or maybe
$img = Image::make($_FILES['myphoto']['tmp_name']);
就 Intervention image manual 而言，它应该可以工作。
如果这不是一个答案，请告诉我是哪段代码给 $thumb 赋值了。
use Illuminate\Support\Facades\Input;
然后改变$thumb变量的值
$inputFileObj = Input::file('filename_here');
$thumb = $inputFileObj->getRealPath();
然后直接使用您的代码即可。
如果MIME类型为octet-stream，则可以这样做：将其编码为Base64并从字符串创建图像，否则按常规方式处理。
$mime_type = $thumb->getMimeType();
$break = explode('/', $mime_type);
if($break[1] == "octet-stream"){
$imagedata = file_get_contents($thumb);
$base64 = base64_encode($imagedata);
Image::make($base64)->resize($this->twidth, $this->theight)->save($this->destination."/".$filename);
}
else{
Image::make($thumb)->resize($this->twidth, $this->theight)->save($this->destination."/".$filename);
}
希望这对你有所帮助
imagecreatefromstring(//上传文件内容//)时，我会收到imagecreatefromstring（）：gd警告：内存分配乘法的一个参数为负数或零，优雅地失败操作的错误提示。 - Mladen Janjetovic