So erstellen Sie ein Miniaturbild eines Rohbilds mit Hilfe von PHP

Question

Ich versuche, den folgenden Code zu verwenden, um Miniaturansichten von Bildern zu erstellen, aber es scheint nicht für einige Bilder zu funktionieren. wahrscheinlich d. h.

1. Bilder, die als roh betrachtet werden. aus einer Digitalkamera genommen

2. Bilder, die groß sind. // nicht sicher, ob es ist auch ein Problem

3. Problem, das ich weiß nicht,

Der Grund, warum ich besorgt bin, ist, dass normale Benutzer, die Bilder in meiner Website don Hochladen würde verstehe solche Komplexität nicht. Alles, was sie sehen wollen, ist ihr Image im Internet.

Der Code

<?php 
//define a maxim size for the uploaded images 
define ("MAX_SIZE","100"); 
// define the width and height for the thumbnail 
// note that theese dimmensions are considered the maximum dimmension and are not fixed, 
// because we have to keep the image ratio intact or it will be deformed 
define ("WIDTH","150"); 
define ("HEIGHT","100"); 

// this is the function that will create the thumbnail image from the uploaded image 
// the resize will be done considering the width and height defined, but without deforming the image 
function make_thumb($img_name,$filename,$new_w,$new_h) 
{ 
//get image extension. 
$ext=getExtension($img_name); 
//creates the new image using the appropriate function from gd library 
if(!strcmp("jpg",$ext) || !strcmp("jpeg",$ext)) 
$src_img=imagecreatefromjpeg($img_name); 

if(!strcmp("png",$ext)) 
$src_img=imagecreatefrompng($img_name); 

//gets the dimmensions of the image 
$old_x=imageSX($src_img); 
$old_y=imageSY($src_img); 

// next we will calculate the new dimmensions for the thumbnail image 
// the next steps will be taken: 
// 1. calculate the ratio by dividing the old dimmensions with the new ones 
// 2. if the ratio for the width is higher, the width will remain the one define in WIDTH variable 
// and the height will be calculated so the image ratio will not change 
// 3. otherwise we will use the height ratio for the image 
// as a result, only one of the dimmensions will be from the fixed ones 
$ratio1=$old_x/$new_w; 
$ratio2=$old_y/$new_h; 
if($ratio1>$ratio2) { 
$thumb_w=$new_w; 
$thumb_h=$old_y/$ratio1; 
} 
else { 
$thumb_h=$new_h; 
$thumb_w=$old_x/$ratio2; 
} 

// we create a new image with the new dimmensions 
$dst_img=ImageCreateTrueColor($thumb_w,$thumb_h); 

// resize the big image to the new created one 
imagecopyresampled($dst_img,$src_img,0,0,0,0,$thumb_w,$thumb_h,$old_x,$old_y); 

// output the created image to the file. Now we will have the thumbnail into the file named by $filename 
if(!strcmp("png",$ext)) 
imagepng($dst_img,$filename); 
else 
imagejpeg($dst_img,$filename); 

//destroys source and destination images. 
imagedestroy($dst_img); 
imagedestroy($src_img); 
} 

// This function reads the extension of the file. 
// It is used to determine if the file is an image by checking the extension. 
function getExtension($str) { 
$i = strrpos($str,"."); 
if (!$i) { return ""; } 
$l = strlen($str) - $i; 
$ext = substr($str,$i+1,$l); 
return $ext; 
} 

// This variable is used as a flag. The value is initialized with 0 (meaning no error found) 
//and it will be changed to 1 if an errro occures. If the error occures the file will not be uploaded. 
$errors=0; 
// checks if the form has been submitted 
if(isset($_POST['Submit'])) 
{ 
//reads the name of the file the user submitted for uploading 
$image=$_FILES['image']['name']; 
// if it is not empty 
if ($image) 
{ 
// get the original name of the file from the clients machine 
$filename = stripslashes($_FILES['image']['name']); 

// get the extension of the file in a lower case format 
$extension = getExtension($filename); 
$extension = strtolower($extension); 
// if it is not a known extension, we will suppose it is an error, print an error message 
//and will not upload the file, otherwise we continue 
if (($extension != "jpg") && ($extension != "jpeg") && ($extension != "png")) 
{ 
echo '<h1>Unknown extension!</h1>'; 
$errors=1; 
} 
else 
{ 
// get the size of the image in bytes 
// $_FILES[\'image\'][\'tmp_name\'] is the temporary filename of the file in which the uploaded file was stored on the server 
$size=getimagesize($_FILES['image']['tmp_name']); 
$sizekb=filesize($_FILES['image']['tmp_name']); 

//compare the size with the maxim size we defined and print error if bigger 
if ($sizekb > MAX_SIZE*4096) 
{ 
echo '<h1>You have exceeded the size limit!</h1>'; 
$errors=1; 
} 

//we will give an unique name, for example the time in unix time format 
$image_name=time().'.'.$extension; 
//the new name will be containing the full path where will be stored (images folder) 
$newname="images/".$image_name; 
$copied = copy($_FILES['image']['tmp_name'], $newname); 
//we verify if the image has been uploaded, and print error instead 
if (!$copied) 
{ 
echo '<h1>Copy unsuccessfull!</h1>'; 
$errors=1; 
} 
else 
{ 
// the new thumbnail image will be placed in images/thumbs/ folder 
$thumb_name='images/thumbs/thumb_'.$image_name; 
// call the function that will create the thumbnail. The function will get as parameters 
//the image name, the thumbnail name and the width and height desired for the thumbnail 
$thumb=make_thumb($newname,$thumb_name,WIDTH,HEIGHT); 
}} }} 

//If no errors registred, print the success message and show the thumbnail image created 
if(isset($_POST['Submit']) && !$errors) 
{ 
echo "<h1>Thumbnail created Successfully!</h1>"; 
echo '<img src="'.$thumb_name.'">'; 
} 

?> 
<!-- next comes the form, you must set the enctype to "multipart/form-data" and use an input type "file" --> 

<form name="newad" method="post" enctype="multipart/form-data" action=""> 
<table> 
<tr><td><input type="file" name="image" ></td></tr> 
<tr><td><input name="Submit" type="submit" value="Upload image"></td></tr> 
</table> 

Jede Hilfe:

würde Jede Lösung nicht notwendig, von meinem Code geschätzt.

Answer 1

Gerade Grenze der Datei erhöhen durch

Ändern

if ($sizekb > MAX_SIZE*4096) 

zu

if ($sizekb > MAX_SIZE*4096000) 

einmal versuchen.