无法创建拇指，图像为黑色
从单个输入上传多个图像并在飞行中创建所有上传图像的拇指形式但当我运行代码时我只获得黑色图像但原始图像与上传相同
<?php
$newname = md5(rand() * time());
$file1 = isset($_FILES['files']['name'][0]) ? $_FILES['files']['name'][0] : null;
$file2 = isset($_FILES['files']['name'][1]) ? $_FILES['files']['name'][1] : null;
$file3 = isset($_FILES['files']['name'][2]) ? $_FILES['files']['name'][2] : null;
$file4 = isset($_FILES['files']['name'][3]) ? $_FILES['files']['name'][3] : null;
$file5 = isset($_FILES['files']['name'][4]) ? $_FILES['files']['name'][4] : null;
if (isset($_FILES['files'])) {
$errors = array();
foreach ($_FILES['files']['tmp_name'] as $key => $tmp_name) {
$file_name = $key . $_FILES['files']['name'][$key];
$file_size = $_FILES['files']['size'][$key];
$file_tmp = $_FILES['files']['tmp_name'][$key];
$file_type = $_FILES['files']['type'][$key];
if ($file_size > 2097152000) {
$errors[] = 'File size must be less than 2 MB';
}
$desired_dir = "user_data/";
if (empty($errors) == true) {
if (is_dir($desired_dir) == false) {
mkdir("$desired_dir", 0700); // Create directory if it does not exist
}
if (is_dir("$desired_dir/" . $file_name) == false) {
move_uploaded_file($file_tmp, "$desired_dir/" . $newname . $file_name);
} else { // rename the file if another one exist
$new_dir = "$desired_dir/" . $newname . $file_name;
rename($file_tmp, $new_dir);
}
} else {
print_r($errors);
}
}
if (empty($error)) {
echo "FILE : $file1<br>";
echo "FILE : $file2<br>";
echo "FILE : $file3<br>";
echo "FILE : $file4<br>";
echo "FILE : $file5<br>";
}
}
$orig_directory = "$desired_dir"; //Full image folder
$thumb_directory = "thumb/"; //Thumbnail folder
/* Opening the thumbnail directory and looping through all the thumbs: */
$dir_handle = @opendir($orig_directory); //Open Full image dirrectory
if ($dir_handle > 1){ //Check to make sure the folder opened
$allowed_types=array('jpg','jpeg','gif','png');
$file_type=array();
$ext='';
$title='';
$i=0;
while ($file_name = @readdir($dir_handle)) {
/* Skipping the system files: */
if($file_name=='.' || $file_name == '..') continue;
$file_type = explode('.',$file_name); //This gets the file name of the images
$ext = strtolower(array_pop($file_type));
/* Using the file name (withouth the extension) as a image title: */
$title = implode('.',$file_type);
$title = htmlspecialchars($title);
/* If the file extension is allowed: */
if(in_array($ext,$allowed_types)) {
/* If you would like to inpute images into a database, do your mysql query here */
/* The code past here is the code at the start of the tutorial */
/* Outputting each image: */
$nw = 100;
$nh = 100;
$source = "$desired_dir{$file_name}";
$stype = explode(".", $source);
$stype = $stype[count($stype)-1];
$dest = "thumb/{$file_name}";
$size = getimagesize($source);
$w = $size[0];
$h = $size[1];
switch($stype) {
case 'gif':
$simg = imagecreatefromgif($source);
break;
case 'jpg':
$simg = imagecreatefromjpeg($source);
break;
case 'png':
$simg = imagecreatefrompng($source);
break;
}
$dimg = imagecreatetruecolor($nw, $nh);
$wm = $w/$nw;
$hm = $h/$nw;
$h_height = $nh/2;
$w_height = $nw/2;
if($w> $h) {
$adjusted_width = $w / $hm;
$half_width = $adjusted_width / 2;
$int_width = $w / $hm;
imagecopyresampled($dimg,$simg,-$int_width,0,0,0,$adjusted_width,$nh,$w,$h);
} else {
imagecopyresampled($dimg,$simg,0,0,0,0,$nw,$nh,$w,$h);
}
imagejpeg($dimg,$dest,100);
}
}
/* Closing the directory */
@closedir($dir_handle);
}
?>
当我运行代码这个怎么出来放文件，不知道发生了什么可以帮助我找到错误 为所有类型的图像格式创建黑色拇指
当我从上面的代码中删除以下代码时，它的工作原理与此代码有关
if($w> $h) {
$adjusted_width = $w / $hm;
$half_width = $adjusted_width / 2;
$int_width = $w / $hm;
imagecopyresampled($dimg,$simg,-$int_width,0,0,0,0,$adjusted_width,$nw,$nh,$w,$h);
} else
4 个答案:
答案 0 :(得分：1)
我认为选择mime类型比扩展更好。
你会这样做：
function check_supported_type($type)
{
switch($type)
{
case "image/jpeg":
case "image/gif":
case "image/png":
return true;
default:
return false;
}
}
function GetMimeType($file)
{
//$type = mime_content_type($file); //deprecated
/* //file info -> normal method, but returns wrong values for ics files..
$finfo = finfo_open(FILEINFO_MIME_TYPE); // return mime type ala mimetype extension
$type = $filename.":".finfo_file($finfo, $filename);
finfo_close($finfo);
*/
$forbiddenChars = array('?', '*', ':', '|', ';', '<', '>');
if(strlen(str_replace($forbiddenChars, '', $file)) < strlen($file))
throw new \ArgumentException("Forbidden characters!");
$file = escapeshellarg($file);
ob_start();
$type = system("file --mime-type -b ".$file);
ob_clean();
return $type;
}
像这样使用它：
$file = "someimage.jpg";
$mime = GetMimeType($file);
if(check_supported_type($mime))
{
//do your image processing
}
希望这会有所帮助
编辑：
也许您可以查看我的其他答案：https://stackoverflow.com/a/26981319/3641016您将看到如何生成拇指。
编辑：
为你的编辑问题添加了答案：
取代：
$wm = $w/$nw;
$hm = $h/$nw;
$h_height = $nh/2;
$w_height = $nw/2;
if($w> $h) {
$adjusted_width = $w / $hm;
$half_width = $adjusted_width / 2;
$int_width = $w / $hm;
imagecopyresampled($dimg,$simg,-$int_width,0,0,0,$adjusted_width,$nh,$w,$h);
} else {
imagecopyresampled($dimg,$simg,0,0,0,0,$nw,$nh,$w,$h);
}
使用：
if($w > $h)
{
imagecopyresampled($dimg, $simg, 0,0, ($nw / $h * $w / 2 - $nw / 2),0, $nw,$nw, $h,$h);
}
else
{
imagecopyresampled($dimg, $simg, 0,0, 0,($nw / $w * $h / 2 - $nw / 2), $nw,$nw, $w,$w);
}
一切都应该没问题。 （如果拇指是二次方的）
答案 1 :(得分：1)
这是我上传多个文件以及裁剪和裁剪它们的代码。
它将图像上传到文件夹，然后选择图像，裁剪图像，重新上传裁剪的图像并删除原始图像。
我相信你可以玩这个
这是php代码
if(isset($_POST['upload_gal']))
{
$fk_id = $_POST['fk_id'];
$errors= array();
foreach($_FILES['files']['tmp_name'] as $key => $tmp_name ){
$file_name = $key.$_FILES['files']['name'][$key];
$file_size =$_FILES['files']['size'][$key];
$file_tmp =$_FILES['files']['tmp_name'][$key];
$file_type=$_FILES['files']['type'][$key];
if($file_type=='image/jpeg'||$type=='image/gif'||$type=='image/bmp'||$type=='image/png')
{
$image_info = getimagesize($_FILES["files"]["tmp_name"][$key]);
$image_width = $image_info[0];
$image_height = $image_info[1];
$desired_dir="brand_images/";
if(empty($errors)==true){
if(is_dir($desired_dir)==false){
mkdir("$desired_dir", 0755); // Create directory if it does not exist
}
$locationing="brand_images/$file_name";
move_uploaded_file($file_tmp,$locationing);
$image = imagecreatefromstring(file_get_contents("brand_images/$file_name"));
$rand = rand(111,43943749739349343);
$filename = "brand_images/$rand-33$file_name";
if($image_width >= 840 && $image_height >= 680)
{
$thumb_width = 1200;
$thumb_height = 700;
}else{
$thumb_width = 800;
$thumb_height = 533;
}
$width = imagesx($image);
$height = imagesy($image);
$original_aspect = $width / $height;
$thumb_aspect = $thumb_width / $thumb_height;
if ( $original_aspect >= $thumb_aspect )
{
// If image is wider than thumbnail (in aspect ratio sense)
$new_height = $thumb_height;
$new_width = $width / ($height / $thumb_height);
}
else
{
// If the thumbnail is wider than the image
$new_width = $thumb_width;
$new_height = $height / ($width / $thumb_width);
}
$thumb = imagecreatetruecolor( $thumb_width, $thumb_height );
// Resize and crop
imagecopyresampled($thumb,
$image,
0 - ($new_width - $thumb_width) / 2, // Center the image horizontally
0 - ($new_height - $thumb_height) / 2, // Center the image vertically
0, 0,
$new_width, $new_height,
$width, $height);
imagejpeg($thumb, $filename, 80);
move_uploaded_file($tmp_name, $filename);
mysql_query("INSERT INTO gallery VALUES('','brand_images/$rand-33$file_name','$fk_id')");
echo"<script>
window.location = document.URL.replace(/#$/, '');
</script>";
}
这是html
<form action="" enctype="multipart/form-data" method="POST">
<h3 class="no_margin-top">Upload a new image</h3>
<hr>
<input type="hidden" name="fk_id" value="<?php echo $brand->brand_id ?>">
<input name="upload_gal" type="submit" class="btn btn-sm pull-right btn-success" value="Upload">
Upload image: <input type="file" name="files[]" multiple>
<p class="text-danger top-buffer">If image is larger than 800x533, the image would be cropped</p>
</form>
答案 2 :(得分：1)
问题
问题位于以下行：
imagecopyresampled($dimg, $simg, -$int_width, 0, 0, 0, $adjusted_width, $nh, $w, $h);
为什么使用负值作为目的地的x？您的源图像实际上位于目标图像的左侧，因此您的目标图像显示为空。
解决方案
我邀请您使用以下功能调整图片大小：
function resizePreservingAspectRatio($img, $targetWidth, $targetHeight)
{
$srcWidth = imagesx($img);
$srcHeight = imagesy($img);
// Determine new width / height preserving aspect ratio
$srcRatio = $srcWidth / $srcHeight;
$targetRatio = $targetWidth / $targetHeight;
if (($srcWidth <= $targetWidth) && ($srcHeight <= $targetHeight))
{
$imgTargetWidth = $srcWidth;
$imgTargetHeight = $srcHeight;
}
else if ($targetRatio > $srcRatio)
{
$imgTargetWidth = (int) ($targetHeight * $srcRatio);
$imgTargetHeight = $targetHeight;
}
else
{
$imgTargetWidth = $targetWidth;
$imgTargetHeight = (int) ($targetWidth / $srcRatio);
}
// Creating new image with desired size
$targetImg = imagecreatetruecolor($targetWidth, $targetHeight);
// Add transparency if your reduced image does not fit with the new size
$targetTransparent = imagecolorallocate($targetImg, 255, 0, 255);
imagefill($targetImg, 0, 0, $targetTransparent);
imagecolortransparent($targetImg, $targetTransparent);
// Copies image, centered to the new one (if it does not fit to it)
imagecopyresampled(
$targetImg, $img, ($targetWidth - $imgTargetWidth) / 2, // centered
($targetHeight - $imgTargetHeight) / 2, // centered
0, 0, $imgTargetWidth, $imgTargetHeight, $srcWidth, $srcHeight
);
return $targetImg;
}
实施
<?php
$newname = md5(rand() * time());
$file1 = isset($_FILES['files']['name'][0]) ? $_FILES['files']['name'][0] : null;
$file2 = isset($_FILES['files']['name'][1]) ? $_FILES['files']['name'][1] : null;
$file3 = isset($_FILES['files']['name'][2]) ? $_FILES['files']['name'][2] : null;
$file4 = isset($_FILES['files']['name'][3]) ? $_FILES['files']['name'][3] : null;
$file5 = isset($_FILES['files']['name'][4]) ? $_FILES['files']['name'][4] : null;
if (isset($_FILES['files']))
{
$errors = array ();
foreach ($_FILES['files']['tmp_name'] as $key => $tmp_name)
{
$file_name = $key . $_FILES['files']['name'][$key];
$file_size = $_FILES['files']['size'][$key];
$file_tmp = $_FILES['files']['tmp_name'][$key];
$file_type = $_FILES['files']['type'][$key];
if ($file_size > 2097152000)
{
$errors[] = 'File size must be less than 2 MB';
}
$desired_dir = "user_data/";
if (empty($errors) == true)
{
if (is_dir($desired_dir) == false)
{
mkdir("$desired_dir", 0700); // Create directory if it does not exist
}
if (is_dir("$desired_dir/" . $file_name) == false)
{
move_uploaded_file($file_tmp, "$desired_dir/" . $newname . $file_name);
}
else
{ // rename the file if another one exist
$new_dir = "$desired_dir/" . $newname . $file_name;
rename($file_tmp, $new_dir);
}
}
else
{
print_r($errors);
}
}
if (empty($error))
{
echo "FILE : $file1<br>";
echo "FILE : $file2<br>";
echo "FILE : $file3<br>";
echo "FILE : $file4<br>";
echo "FILE : $file5<br>";
}
$orig_directory = "$desired_dir"; //Full image folder
$thumb_directory = "thumb/"; //Thumbnail folder
/* Opening the thumbnail directory and looping through all the thumbs: */
$dir_handle = @opendir($orig_directory); //Open Full image dirrectory
if ($dir_handle > 1)
{ //Check to make sure the folder opened
$allowed_types = array ('jpg', 'jpeg', 'gif', 'png');
$file_type = array ();
$ext = '';
$title = '';
$i = 0;
while ($file_name = @readdir($dir_handle))
{
/* Skipping the system files: */
if ($file_name == '.' || $file_name == '..')
continue;
$file_type = explode('.', $file_name); //This gets the file name of the images
$ext = strtolower(array_pop($file_type));
/* Using the file name (withouth the extension) as a image title: */
$title = implode('.', $file_type);
$title = htmlspecialchars($title);
/* If the file extension is allowed: */
if (in_array($ext, $allowed_types))
{
/* If you would like to inpute images into a database, do your mysql query here */
/* The code past here is the code at the start of the tutorial */
/* Outputting each image: */
$nw = 100;
$nh = 100;
$source = "$desired_dir{$file_name}";
$stype = explode(".", $source);
$stype = $stype[count($stype) - 1];
$dest = "thumb/{$file_name}";
$size = getimagesize($source);
$w = $size[0];
$h = $size[1];
switch ($stype)
{
case 'gif':
$simg = imagecreatefromgif($source);
break;
case 'jpg':
$simg = imagecreatefromjpeg($source);
break;
case 'png':
$simg = imagecreatefrompng($source);
break;
}
$dimg = resizePreservingAspectRatio($simg, $nw, $nh);
imagepng($dimg, $dest);
}
}
/* Closing the directory */
@closedir($dir_handle);
}
}
function resizePreservingAspectRatio($img, $targetWidth, $targetHeight)
{
$srcWidth = imagesx($img);
$srcHeight = imagesy($img);
// Determine new width / height preserving aspect ratio
$srcRatio = $srcWidth / $srcHeight;
$targetRatio = $targetWidth / $targetHeight;
if (($srcWidth <= $targetWidth) && ($srcHeight <= $targetHeight))
{
$imgTargetWidth = $srcWidth;
$imgTargetHeight = $srcHeight;
}
else if ($targetRatio > $srcRatio)
{
$imgTargetWidth = (int) ($targetHeight * $srcRatio);
$imgTargetHeight = $targetHeight;
}
else
{
$imgTargetWidth = $targetWidth;
$imgTargetHeight = (int) ($targetWidth / $srcRatio);
}
// Creating new image with desired size
$targetImg = imagecreatetruecolor($targetWidth, $targetHeight);
// Add transparency if your reduced image does not fit with the new size
$targetTransparent = imagecolorallocate($targetImg, 255, 0, 255);
imagefill($targetImg, 0, 0, $targetTransparent);
imagecolortransparent($targetImg, $targetTransparent);
// Copies image, centered to the new one (if it does not fit to it)
imagecopyresampled(
$targetImg, $img, ($targetWidth - $imgTargetWidth) / 2, // centered
($targetHeight - $imgTargetHeight) / 2, // centered
0, 0, $imgTargetWidth, $imgTargetHeight, $srcWidth, $srcHeight
);
return $targetImg;
}
?>
<form method="post" enctype="multipart/form-data">
<input name="files[]" type="file"/><br/>
<input name="files[]" type="file"/><br/>
<input name="files[]" type="file"/><br/>
<input name="files[]" type="file"/><br/>
<input name="files[]" type="file"/><br/>
<input type="submit"/>
</form>
注意：我保存为PNG，就像你想要使用非方形图像（例如800x600）的100x100图像一样，并且在不打破其宽高比的情况下，我们应该将透明度放在未使用的空间后面并且JPEG不支持它
答案 3 :(得分：1)
以下代码将通过映射到正确的imagecreatefrom *函数或使用无效的图像类型抛出异常来解决问题。
switch(strtolower($stype)) {
case 'gif':
$simg = imagecreatefromgif($source);
break;
case 'jpg':
case 'jpeg':
$simg = imagecreatefromjpeg($source);
break;
case 'png':
$simg = imagecreatefrompng($source);
break;
default:
throw new \Exception('invalid image type :'.$stype);
break;
}
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