---
title: "Bildresize"
type: "forum-thread"
url: "https://www.webforum.nu/amne/php/186017-bildresize"
topic: "PHP"
topic_url: "https://www.webforum.nu/amne/php"
author: "SoulGod"
published: "2011-02-07T17:39:47.000Z"
updated: "2011-02-12T10:35:41.000Z"
replies: 3
views: 1682
page: 1
pages: 1
language: "sv-SE"
site: "webForum — webforum.nu"
rights: "Upphovsrätten till varje inlägg tillhör dess författare."
attribution: "Citera som: webForum, https://www.webforum.nu/amne/php/186017-bildresize"
---

# Bildresize

## #1 — SoulGod, 2011-02-07T17:39Z

Jag har ordnat så att jag kan ladda upp bilder tillsammans med nyheter, recensioner m.m....

Jag undrar om någon har ett bra script för resize av bilder,
jag vill alltså kunna ändra bilden ner till en viss bredd...

Har hittat flera på nätet, men de flesta är väldigt långa,
och med min osäkerhet inom PHP vågar jag inte klistra in i denna kod .. 

Någon som har ett bra script, och hjälpa till att implementera det?

Koden ser ut såhär:

```
if(mysql_real_escape_string($_GET['do']) == "spara") {
//define a maxim size for the uploaded images in Kb
 define ("MAX_SIZE","800"); 

//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 and will not  upload the file,  
	//otherwise we will do more tests
 if (($extension != "jpg") && ($extension != "jpeg") && ($extension != "png") && ($extension != "gif")) 
 		{
		//print error message
 			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
 $size=filesize($_FILES['image']['tmp_name']);

//compare the size with the maxim size we defined and print error if bigger
if ($size > MAX_SIZE*1024)
{
	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)
$newname="img/nyheter/".$image_name;
//we verify if the image has been uploaded, and print error instead
$copied = copy($_FILES['image']['tmp_name'], $newname);
if (!$copied) 
{
	echo '<h1>Copy unsuccessfull!</h1>';
	$errors=1;
}}}}

//If no errors registred, print the success message
 if(isset($_POST['Submit']) && !$errors)
 {
 	$titel = mysql_real_escape_string($_POST['titel']);
	$skribent = mysql_real_escape_string($_POST['skribent']);	
	$skriven = mysql_real_escape_string($_POST['skriven']);
	$nyhet = mysql_real_escape_string($_POST['nyhet']);
	$img = $image_name;
	
	mysql_query("INSERT INTO nyhet (titel, skribent, skriven, nyhet, img) values ('$titel', '$skribent', '$skriven', '$nyhet', '$img')"); 	
  
	// När allt är sparat, skicka vidare till nyheter
	header('Location: nyhet.php'); }
 }
```

Permalänk: https://www.webforum.nu/p/186017

## #2 — UrMe, 2011-02-11T14:32Z

Jag har en funktion som sparar + resizar bilder, du kanske kan använda den till något.

Används så här:

```php
$remote_img = "http://www.domain.com/image.jpg";
$image_name = "asdasd.jpg";
save_image($remote_img, 'images/'.$image_name);
```

I funktionen save_image anropas funktionen Image där man ställer in storlek etc.

```php

function save_image($img,$fullpath){
	$ch = curl_init ($img);
	curl_setopt($ch, CURLOPT_HEADER, 0);
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
	curl_setopt($ch, CURLOPT_BINARYTRANSFER,1);
	$rawdata=curl_exec($ch);
	curl_close ($ch);
	/*if(file_exists($fullpath)){
		unlink($fullpath);
	}*/
	$fp = fopen($fullpath,'x');
	fwrite($fp, $rawdata);
	fclose($fp);
	
	if(Image($fullpath,$fullpath,'1:1','90x74') == true) {
		return true;
	} else {
		return false;
	}
}

function Image($image1, $newimage, $crop = null, $size = null)
{
    @$image = ImageCreateFromString(file_get_contents($image1));
		

    if (is_resource($image) === true)
    {
        $x = 0;
        $y = 0;
        $width = imagesx($image);
        $height = imagesy($image);

        /*
        CROP (Aspect Ratio) Section
        */

        if (is_null($crop) === true)
        {
                $crop = array($width, $height);
        }

        else
        {
                $crop = array_filter(explode(':', $crop));

                if (empty($crop) === true)
                {
                        $crop = array($width, $height);
                }

                else
                {
                        if ((empty($crop[0]) === true) || (is_numeric($crop[0]) === false))
                        {
                                $crop[0] = $crop[1];
                        }

                        else if ((empty($crop[1]) === true) || (is_numeric($crop[1]) === false))
                        {
                                $crop[1] = $crop[0];
                        }
                }

                $ratio = array
                (
                        0 => $width / $height,
                        1 => $crop[0] / $crop[1],
                );

                if ($ratio[0] > $ratio[1])
                {
                        $width = $height * $ratio[1];
                        $x = (imagesx($image) - $width) / 2;
                }

                else if ($ratio[0] < $ratio[1])
                {
                        $height = $width / $ratio[1];
                        $y = (imagesy($image) - $height) / 2;
                }

                $result = ImageCreateTrueColor($width, $height);

                if (is_resource($result) === true)
                {
                        ImageSaveAlpha($result, true);
                        ImageAlphaBlending($result, false);
                        ImageFill($result, 0, 0, ImageColorAllocateAlpha($result, 255, 255, 255, 127));

                        ImageCopyResampled($result, $image, 0, 0, $x, $y, $width, $height, $width, $height);

                        $image = $result;
                }
        }

        /*
        Resize Section
        */

        if (is_null($size) === true)
        {
                $size = array(imagesx($image), imagesy($image));
        }

        else
        {
                $size = array_filter(explode('x', $size));

                if (empty($size) === true)
                {
                        $size = array(imagesx($image), imagesy($image));
                }

                else
                {
                        if ((empty($size[0]) === true) || (is_numeric($size[0]) === false))
                        {
                                $size[0] = round($size[1] * imagesx($image) / imagesy($image));
                        }

                        else if ((empty($size[1]) === true) || (is_numeric($size[1]) === false))
                        {
                                $size[1] = round($size[0] * imagesy($image) / imagesx($image));
                        }
                }
        }
        $result = ImageCreateTrueColor($size[0], $size[1]);

        if (is_resource($result) === true)
        {
                ImageSaveAlpha($result, true);
                ImageAlphaBlending($result, true);
                ImageFill($result, 0, 0, ImageColorAllocate($result, 255, 255, 255));
                ImageCopyResampled($result, $image, 0, 0, 0, 0, $size[0], $size[1], imagesx($image), imagesy($image));
                ImageInterlace($result, true);
                ImageJPEG($result, $newimage, 90);
        }
    } else {
    	return false;
    }
    return true;
}
```

Permalänk: https://www.webforum.nu/p/2267770

## #3 — MickeA.com, 2011-02-12T01:46Z

Jag skulle rekommendera att du använder [phpThumbnailer](http://phpthumb.gxdlabs.com/), så får du allt "klart" direkt. Mycket enkelt att använda.

Just nu verkar dock deras sajt ligga nere.

Permalänk: https://www.webforum.nu/p/2267798

## #4 — jme, 2011-02-12T10:35Z

<https://github.com/avalanche123/Imagine>

Permalänk: https://www.webforum.nu/p/2267810

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Tråden på webben: https://www.webforum.nu/amne/php/186017-bildresize