php php在上传时调整图像大小
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php resize image on upload
提问by kfirba
I got a form where the user is inserting some data and also uploading an image.
我得到了一个表单，用户在其中插入一些数据并上传图像。
To deal with the image, I got the following code:
为了处理图像，我得到了以下代码：
define("MAX_SIZE", "10000");
$errors = 0;
$image = $_FILES["fileField"]["name"];
$uploadedfile = $_FILES['fileField']['tmp_name'];
if($image){
$filename = stripslashes($_FILES['fileField']['name']);
$extension = strtolower(getExtension($filename));
if (($extension != "jpg") && ($extension != "jpeg") && ($extension != "png") && ($extension != "gif")){
echo ' Unknown Image extension ';
$errors = 1;
} else {
$newname = "$product_cn.$extension";
$size = filesize($_FILES['fileField']['tmp_name']);
if ($size > MAX_SIZE*1024){
echo "You have exceeded the size limit";
$errors = 1;
}
if($extension == "jpg" || $extension == "jpeg" ){
$uploadedfile = $_FILES['file']['tmp_name'];
$src = imagecreatefromjpeg($uploadedfile);
} else if($extension == "png"){
$uploadedfile = $_FILES['file']['tmp_name'];
$src = imagecreatefrompng($uploadedfile);
} else {
$src = imagecreatefromgif($uploadedfile);
}
list($width, $height) = getimagesize($uploadedfile);
$newwidth = 60;
$newheight = ($height/$width)*$newwidth;
$tmp = imagecreatetruecolor($newwidth, $newheight);
$newwidth1 = 25;
$newheight1 = ($height/$width)*$newwidth1;
$tmp1 = imagecreatetruecolor($newwidth1, $newheight1);
imagecopyresampled($tmp, $src, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
imagecopyresampled($tmp1, $src, 0, 0, 0, 0, $newwidth1, $newheight1, $width, $height);
$filename = "../products_images/$newname";
$filename1 = "../products_images/thumbs/$newname";
imagejpeg($tmp, $filename, 100); // file name also indicates the folder where to save it to
imagejpeg($tmp1, $filename1, 100);
imagedestroy($src);
imagedestroy($tmp);
imagedestroy($tmp1);
}
}
getExtension function:
获取扩展功能：
function getExtension($str) {
$i = strrpos($str, ".");
if (!$i) { return ""; }
$l = strlen($str) - $i;
$ext = substr($str,$i+1,$l);
return $ext;
}
I've wrote some notation in the code since I'm not really familiar with those functions.
我在代码中写了一些符号，因为我对这些函数不是很熟悉。
For some reason, it doesn't work. When I'm going to the folder "product_images" or "product_images/thumbs", I can't find any image uploaded.
出于某种原因，它不起作用。当我转到文件夹“product_images”或“product_images/thumbs”时，我找不到任何上传的图片。
Any idea what's wrong with my code? There should be 60px width image, and 25px width image.
知道我的代码有什么问题吗？应该有 60px 宽度的图像和 25px 宽度的图像。
Note: Variables that you don't know where they were declared such as $product_cnwere declared before that block of code which works prefectly fine (tested). If you still want a glance at it, feel free to ask for the code.
注意：您不知道它们在哪里声明的变量，例如$product_cn在该代码块之前声明的，该代码块工作正常（经过测试）。如果您仍然想看一眼，请随时索取代码。
Thanks in advance!
提前致谢！
采纳答案by Alok M. Kejriwal
You can use this library to manipulate the image while uploading. http://www.verot.net/php_class_upload.htm
您可以使用此库在上传时操作图像。http://www.verot.net/php_class_upload.htm
回答by zeusstl
Here is another nice and easy solution:
这是另一个不错且简单的解决方案：
$maxDim = 800;
$file_name = $_FILES['myFile']['tmp_name'];
list($width, $height, $type, $attr) = getimagesize( $file_name );
if ( $width > $maxDim || $height > $maxDim ) {
$target_filename = $file_name;
$ratio = $width/$height;
if( $ratio > 1) {
$new_width = $maxDim;
$new_height = $maxDim/$ratio;
} else {
$new_width = $maxDim*$ratio;
$new_height = $maxDim;
}
$src = imagecreatefromstring( file_get_contents( $file_name ) );
$dst = imagecreatetruecolor( $new_width, $new_height );
imagecopyresampled( $dst, $src, 0, 0, 0, 0, $new_width, $new_height, $width, $height );
imagedestroy( $src );
imagepng( $dst, $target_filename ); // adjust format as needed
imagedestroy( $dst );
}
Reference: PHP resize image proportionally with max width or weight
Edit: Cleaned up and simplified the code a bit. Thanks @jan-mirus for your comment.
编辑：稍微清理并简化了代码。感谢@jan-mirus 的评论。
回答by Edwinfad
// This was my example that I used to automatically resize every inserted photo to 100 by 50 pixel and image format to jpeg hope this helps too
// 这是我的示例，我曾经将每张插入的照片自动调整为 100 x 50 像素和图像格式为 jpeg 希望这也有帮助
if($result){
$maxDimW = 100;
$maxDimH = 50;
list($width, $height, $type, $attr) = getimagesize( $_FILES['photo']['tmp_name'] );
if ( $width > $maxDimW || $height > $maxDimH ) {
$target_filename = $_FILES['photo']['tmp_name'];
$fn = $_FILES['photo']['tmp_name'];
$size = getimagesize( $fn );
$ratio = $size[0]/$size[1]; // width/height
if( $ratio > 1) {
$width = $maxDimW;
$height = $maxDimH/$ratio;
} else {
$width = $maxDimW*$ratio;
$height = $maxDimH;
}
$src = imagecreatefromstring(file_get_contents($fn));
$dst = imagecreatetruecolor( $width, $height );
imagecopyresampled($dst, $src, 0, 0, 0, 0, $width, $height, $size[0], $size[1] );
imagejpeg($dst, $target_filename); // adjust format as needed
}
move_uploaded_file($_FILES['pdf']['tmp_name'],"pdf/".$_FILES['pdf']['name']);
回答by GURU WEB
<form action="<?php echo $_SERVER["PHP_SELF"]; ?>" method="post" enctype="multipart/form-data" id="something" class="uniForm">
<input name="new_image" id="new_image" size="30" type="file" class="fileUpload" />
<button name="submit" type="submit" class="submitButton">Upload Image</button>
</form>
<?php
if(isset($_POST['submit'])){
if (isset ($_FILES['new_image'])){
$imagename = $_FILES['new_image']['name'];
$source = $_FILES['new_image']['tmp_name'];
$target = "images/".$imagename;
$type=$_FILES["new_image"]["type"];
if($type=="image/jpeg" || $type=="image/jpg"){
move_uploaded_file($source, $target);
//orginal image making part
$imagepath = $imagename;
$save = "images/" . $imagepath; //This is the new file you saving
$file = "images/" . $imagepath; //This is the original file
list($width, $height) = getimagesize($file) ;
$modwidth = 1000;
$diff = $width / $modwidth;
$modheight = $height / $diff;
$tn = imagecreatetruecolor($modwidth, $modheight) ;
$image = imagecreatefromjpeg($file) ;
imagecopyresampled($tn, $image, 0, 0, 0, 0, $modwidth, $modheight, $width, $height) ;
echo "Large image: <img src='images/".$imagepath."'><br>";
imagejpeg($tn, $save, 100) ;
//thumbnail image making part
$save = "images/thumb/" . $imagepath; //This is the new file you saving
$file = "images/" . $imagepath; //This is the original file
list($width, $height) = getimagesize($file) ;
$modwidth = 150;
$diff = $width / $modwidth;
$modheight = $height / $diff;
$tn = imagecreatetruecolor($modwidth, $modheight) ;
$image = imagecreatefromjpeg($file) ;
imagecopyresampled($tn, $image, 0, 0, 0, 0, $modwidth, $modheight, $width, $height) ;
//echo "Thumbnail: <img src='images/sml_".$imagepath."'>";
imagejpeg($tn, $save, 100) ;
}
else{
echo "File is not image";
}
}
}
?>
回答by HoldOffHunger
If you want to use Imagick out of the box (included with most PHP distributions), it's as easy as...
如果您想开箱即用地使用 Imagick（包含在大多数 PHP 发行版中），它就像...
$image = new Imagick();
$image_filehandle = fopen('some/file.jpg', 'a+');
$image->readImageFile($image_filehandle);
$image->scaleImage(100,200,FALSE);
$image_icon_filehandle = fopen('some/file-icon.jpg', 'a+');
$image->writeImageFile($image_icon_filehandle);
You will probably want to calculate width and height more dynamically based on the original image. You can get an image's current width and height, using the above example, with $image->getImageHeight();and $image->getImageWidth();
您可能希望根据原始图像更动态地计算宽度和高度。你可以得到的图像当前的宽度和高度，使用上面的例子，与$image->getImageHeight();和$image->getImageWidth();
回答by HoldOffHunger
This thing worked for me. No any external liabraries used
这件事对我有用。没有使用任何外部库
define ("MAX_SIZE","3000");
function getExtension($str) {
$i = strrpos($str,".");
if (!$i) { return ""; }
$l = strlen($str) - $i;
$ext = substr($str,$i+1,$l);
return $ext;
}
$errors=0;
if($_SERVER["REQUEST_METHOD"] == "POST")
{
$image =$_FILES["image-1"]["name"];
$uploadedfile = $_FILES['image-1']['tmp_name'];
if ($image)
{
$filename = stripslashes($_FILES['image-1']['name']);
$extension = getExtension($filename);
$extension = strtolower($extension);
if (($extension != "jpg") && ($extension != "jpeg") && ($extension != "png") && ($extension != "gif"))
{
echo "Unknown Extension..!";
}
else
{
$size=filesize($_FILES['image-1']['tmp_name']);
if ($size > MAX_SIZE*1024)
{
echo "File Size Excedeed..!!";
}
if($extension=="jpg" || $extension=="jpeg" )
{
$uploadedfile = $_FILES['image-1']['tmp_name'];
$src = imagecreatefromjpeg($uploadedfile);
}
else if($extension=="png")
{
$uploadedfile = $_FILES['image-1']['tmp_name'];
$src = imagecreatefrompng($uploadedfile);
}
else
{
$src = imagecreatefromgif($uploadedfile);
echo $scr;
}
list($width,$height)=getimagesize($uploadedfile);
$newwidth=1000;
$newheight=($height/$width)*$newwidth;
$tmp=imagecreatetruecolor($newwidth,$newheight);
$newwidth1=1000;
$newheight1=($height/$width)*$newwidth1;
$tmp1=imagecreatetruecolor($newwidth1,$newheight1);
imagecopyresampled($tmp,$src,0,0,0,0,$newwidth,$newheight,$width,$height);
imagecopyresampled($tmp1,$src,0,0,0,0,$newwidth1,$newheight1,$width,$height);
$filename = "../images/product-image/Cars/". $_FILES['image-1']['name'];
$filename1 = "../images/product-image/Cars/small". $_FILES['image-1']['name'];
imagejpeg($tmp,$filename,100);
imagejpeg($tmp1,$filename1,100);
imagedestroy($src);
imagedestroy($tmp);
imagedestroy($tmp1);
}}
}
回答by Abd Abughazaleh
index.php :
索引.php :
<!DOCTYPE html>
<html>
<head>
<title>PHP Image resize to upload</title>
</head>
<body>
<div class="container">
<form action="pro.php" method="post" enctype="multipart/form-data">
<input type="file" name="image" />
<input type="submit" name="submit" value="Submit" />
</form>
</div>
</body>
</html>
upload.php
上传.php
<?php
if(isset($_POST["submit"])) {
if(is_array($_FILES)) {
$file = $_FILES['image']['tmp_name'];
$sourceProperties = getimagesize($file);
$fileNewName = time();
$folderPath = "upload/";
$ext = pathinfo($_FILES['image']['name'], PATHINFO_EXTENSION);
$imageType = $sourceProperties[2];
switch ($imageType) {
case IMAGETYPE_PNG:
$imageResourceId = imagecreatefrompng($file);
$targetLayer = imageResize($imageResourceId,$sourceProperties[0],$sourceProperties[1]);
imagepng($targetLayer,$folderPath. $fileNewName. "_thump.". $ext);
break;
case IMAGETYPE_GIF:
$imageResourceId = imagecreatefromgif($file);
$targetLayer = imageResize($imageResourceId,$sourceProperties[0],$sourceProperties[1]);
imagegif($targetLayer,$folderPath. $fileNewName. "_thump.". $ext);
break;
case IMAGETYPE_JPEG:
$imageResourceId = imagecreatefromjpeg($file);
$targetLayer = imageResize($imageResourceId,$sourceProperties[0],$sourceProperties[1]);
imagejpeg($targetLayer,$folderPath. $fileNewName. "_thump.". $ext);
break;
default:
echo "Invalid Image type.";
exit;
break;
}
move_uploaded_file($file, $folderPath. $fileNewName. ".". $ext);
echo "Image Resize Successfully.";
}
}
function imageResize($imageResourceId,$width,$height) {
$targetWidth =200;
$targetHeight =200;
$targetLayer=imagecreatetruecolor($targetWidth,$targetHeight);
imagecopyresampled($targetLayer,$imageResourceId,0,0,0,0,$targetWidth,$targetHeight, $width,$height);
return $targetLayer;
}
?>
回答by Pankaj Upadhyay
Download library file Zebra_Image.php belo link
下载库文件 Zebra_Image.php belo 链接
https://drive.google.com/file/d/0Bx-7K3oajNTRV1I2UzYySGZFd3M/view
https://drive.google.com/file/d/0Bx-7K3oajNTRV1I2UzYySGZFd3M/view
resizeimage.php
调整图片大小
<?php
require 'Zebra_Image.php';
// create a new instance of the class
$resize_image = new Zebra_Image();
// indicate a source image
$resize_image->source_path = $target_file1;
$ext = $photo;
// indicate a target image
$resize_image->target_path = 'images/thumbnil/' . $ext;
// resize
// and if there is an error, show the error message
if (!$resize_image->resize(200, 200, ZEBRA_IMAGE_NOT_BOXED, -1));
// from this moment on, work on the resized image
$resize_image->source_path = 'images/thumbnil/' . $ext;
?>
回答by ziiweb
You can use Imagine library also. It uses GD and Imagick.
您也可以使用 Imagine 库。它使用 GD 和 Imagick。
