PHP 5.5.17 is available

imagecreatefromstring

(PHP 4 >= 4.0.4, PHP 5)

imagecreatefromstringCreate a new image from the image stream in the string

Description

resource imagecreatefromstring ( string $image )

imagecreatefromstring() returns an image identifier representing the image obtained from the given image. These types will be automatically detected if your build of PHP supports them: JPEG, PNG, GIF, WBMP, and GD2.

Parameters

image

A string containing the image data.

Return Values

An image resource will be returned on success. FALSE is returned if the image type is unsupported, the data is not in a recognised format, or the image is corrupt and cannot be loaded.

Examples

Example #1 imagecreatefromstring() example

<?php
$data 
'iVBORw0KGgoAAAANSUhEUgAAABwAAAASCAMAAAB/2U7WAAAABl'
       
'BMVEUAAAD///+l2Z/dAAAASUlEQVR4XqWQUQoAIAxC2/0vXZDr'
       
'EX4IJTRkb7lobNUStXsB0jIXIAMSsQnWlsV+wULF4Avk9fLq2r'
       
'8a5HSE35Q3eO2XP1A1wQkZSgETvDtKdQAAAABJRU5ErkJggg==';
$data base64_decode($data);

$im imagecreatefromstring($data);
if (
$im !== false) {
    
header('Content-Type: image/png');
    
imagepng($im);
    
imagedestroy($im);
}
else {
    echo 
'An error occurred.';
}
?>

The above example will output something similar to:

Output of example : imagecreatefromstring()

See Also

add a note add a note

User Contributed Notes 14 notes

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2
hope at it-helps dot com
3 years ago
Create an image resource from file, without knowing image type:

<?php
function imagecreatefromfile($imagepath=false) {
    if(!
$imagepath || !$is_readable($imagepath) return false;
    return @
imagecreatefromstring(file_get_contents($imagepath));
}
$img_resource=imagecreatefromfile($imagepath);
?>
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3
ville dot jungman at gmail dot com
5 years ago
While downloading images from internet, it's easiest to let php decide what is the file type. So, forget using imagecreatefromjpg, imagecreatefromgif and imagecreatefrompng. Instead, this is the way to go:

<?php
$src
= "http://www.varuste.net/tiedostot/l_ylabanneri.jpg";
$image = imagecreatefromstring(file_get_contents($src));
?>
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1
php dot net at phor dot net
4 years ago
My site allows anonymous uploads to a web-accessible location (that will execute a script if it finds one).

Naturally, I need to verify that only harmless content is accepted. I am expecting only images, so I use:

<?php
  $im
= $imagecreatefromstring($USERFILE);
 
$valid = ($im != FALSE);
 
imagedestroy($im);
  return
$valid;
?>
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0
nfo[NOSPAM] at safernetworks dot net
6 years ago
The only way I managed to resolve the loading of image files from file data either on local site or from off-site protocols is as follows. I hope this saves someone else the two hours of debugging and looking for good examples.
[PHP]

<?php
$sFile
= "http://www.justgreatwine.co.uk/img/vineyard.jpg";
$imagedata = GetFileData($sFile); //load the file in 4k chunks
/*=======THE OUTPUT=========*/
ob_start();
// assuming you have image data in $imagedata
$length = strlen($imagedata);
header('Last-Modified: '.date('r'));
header('Accept-Ranges: bytes');
header('Content-Length: '.$length);
header('Content-Type: image/jpeg');
print(
$imagedata);
ob_end_flush();
/*======FUNCTIONS USED======*/
function GetFileData($sFilePath){
   
$fp = fopen($sFilePath, 'rb') or die('404! Unable to open file!');
   
$buf = '';
    while(!
feof($fp)){
       
$buf .= fgets($fp, 4096);
    }
   
fclose($fp);
return
$buf; //returns False if failed, else the contents up to FileSize bytes.
}
?>

[/PHP]
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0
Blizzke at gmail dot com
7 years ago
I use dynamically generated images that require a little touch-up before being displayed. So essentially I do some base work, then store the images in a memory cache (APC), reload the images again from the cache later on "into" GD, do final processing and then display the image.
Since I wanted to avoid a lot of disc access I used the output buffering functions:

<?php
  
// Do your image processing stuff
  
   // Start buffering
  
ob_start ( );
  
ImageGD ( $hImage );
  
$sImage = ob_get_contents ( );
  
ob_end_clean ( );

  
// Put stuff into cache

   // Reload from cache and recreate image
  
$hImage = imagecreatefromstring ( $sImage );

  
// Do final editing stuff and output image
?>

Of course this is a condensed example but I just wanted to share the idea.
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0
junkmail at pmobl dot com
8 years ago
I know a lot of people have been having trouble using images from the Sprint PPC6700 with GD.  The jpeg library always thows an error about 16 bytes of extraneous data.  I decided to poke around in a hex editor and found those extraneous bytes occur right at the end of the exif data.

By removing this extraneous data, images can easily be manipulated by GD and the EXIF extension as a normal images.  This also removes any problems using the images with GIMP which must rely on the same jpeg libraries.

Here is a function that will check to see if an image is from the PPC6700 and then remove the extraneous data for you.  The result can successully be used with imagecreatefromstring

Author: Paul Visco
IM: paulsidekick
Created: 2-12-06

function checkFixPPC6700($orig){

    //get the file contents
    $data = file_get_contents($orig);

    //if its a PPC 6700 image cut out the extraneous 16 bits
    if(strstr($data, "\x41\x70\x61\x63\x68\x65\x00\x48")){
//this next line can all be one string I split it up so the form on php.net would accept it
        $bad_data ="\x00\x10\x4A\x46" . "\x49\x46\x00\x01\x01" . "\x00\x00\x01\x00\x01\x00\x00";
        return substr_replace($data, "", strpos($data, $bad_data),
        strlen($bad_data));
    } else {
        //if not from a PPC 6700 return data unaltered
         return $data;
    }

}
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0
kakail at aei dot ca
8 years ago
I found out that in PHP 4.3.2 and 4.3.4 that the 'imagecreatefromstring' function use a lot of memory when working with big image...
Try this piece of code with a big image (like 1Meg or more)
<?php
$loadFile
= "http://bigimage.jpg";//Try with a big image
$im = imagecreatefromstring(file_get_contents($loadFile));
imagejpeg($im);
?>

With a 400k image. I run with a 16M Mem_limit but for a 1.4M image, the mem_limit required jump to more that 32M
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0
alexandrebr at ignorethis dot gmail dot com
9 years ago
An easy example to help understanding this function...

<?
$loadFile = "http://static.php.net/images/php.gif";

$im = imagecreatefromstring(file_get_contents($loadFile));
// identical to imagecreatefromgif($loadFile);
imagegif($im);
?>

The function will try to auto-determine file format (jpg, gif, png....), and will return false if fails.
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0
paul at epeeps dot net
9 years ago
I run a blogging site that allowed users to publish images from their cell phones.  For some reason, the nokia 3220 produces jpegs with extrandeous data before the EOF 0xFFF9

I wrote this class to allow you to fix the images so that they can be used with GD to resize and manipulate.  Without applying the fix both GD and gimp report errors for the file.  If basically keeps eating bytes from the junk part till the file is a valid jpeg.  Here is an example bunk pic written by a nokia 3220 that you cna test it with http://www.shawnrider.com/moblog/cache/0854747001121624103.jpg

/*
Author: Paul Visco
Hompage: http://www.elmwoodstrip.com?u=paul
AIM: paulsidekick
Notes:  The file allows you fix the jpegs created by the Nokia 3220 picture phone so that they can be manipulated using the GD library with PHP.

Usage:  Simply instanitiate the class and then call the fix method for each image.
e.g.
$nokia = new nokia;
$nokia->debug ="y";
$nokia->fix("yourpic.jpg");
*/

class nokia
{
    public $file;
    public $debug = "n";
    public $dir_name = "";
    private $img; //the image created from the string
    private $str;
   
    function fix($file)
    {
       
        //set the file to fix
        $this->file = $file;
   
        //load the file into a string
        $this->str = file_get_contents($this->file);
       
        //test to see if it is a nokia image or if it has been corrupted previously
        if (substr_count($this->str, chr(0x28).chr(0x36).chr(0x28).chr(0x2B)) == 0 || @imagecreatefromstring($this->str))
        {
            if ($this->debug =="y")
            {
                echo "\n<br />".$this->file." is not a corrupted Nokia pic";
            }
           
            return true;
        }
       
        //make a directory for fixed images if it doesn't exist and is specified
        if(!empty($this->dir_name) && !is_dir($this->dir_name))
        {
            @mkdir($this->dir_name, 0777);
        }
       
        //strip out the funk e crap from the file
        $this->eat($this->str);
       
        //write the file back to itself
        file_put_contents($this->dir_name.$this->file, $this->str);

        //return true for fixed
        return true;

    }
   
    function eat()
    {
   
        //check the image
        $this->img = @imagecreatefromstring($this->str);
       
        //if the image doesn't work then keep striping out crap
        while(!$this->img)
        {
            //cut off the bad bytes one by one
            $this->str= substr_replace($this->str, "", -3, -2);
           
            //check the image again
            $this->img = @imagecreatefromstring($this->str);
        } 
       
        if ($this->debug =="y")
        {
            //notify the user it's fixed
            echo "\n<br />Nasty bits eaten!! ".$this->file." is fixed now thanks to p:labs!";
        }
        return true;
    }

}
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0
not given
11 years ago
A note to the previous question (if you still don't know it :))...

GIF's are 256 colors (or 8 bit), and the resample function needs true color I guess... that's why it works with JPG's and not with GIF's.

Next thing... you take a string, write it to file, open the file (imagecreatefromgif), and delete the file again.

if you do imagecreatefromstring($string) you can skip the temporary file part.
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0
shiehj at yahoo dot com
11 years ago
Here is the code I did to create a thumbnail image from the database blob field. The trick is to use "imagecreatefromstring()" to create an image file.

Jack Shieh

<?php
require("dbconfig.inc");

$id = $_GET['id'];

if(
$id) {

   
$link = @mysql_connect($host, $user, $password) or die("Could not connect: " . mysql_error());
    @
mysql_select_db($dbname, $link);

   
$query = "select filetype, image from pictures where id = $id";
   
$result = @mysql_query($query);

   
$data = @mysql_result($result,0,"image");
   
$type = @mysql_result($result,0,"filetype");
   
   
Header( "Content-type: $type");   
   
   
$size = 150// new image width
   
$src = imagecreatefromstring($data);
   
$width = imagesx($src);
   
$height = imagesy($src);
   
$aspect_ratio = $height/$width;

    if (
$width <= $size) {
     
$new_w = $width;
     
$new_h = $height;
    } else {
     
$new_w = $size;
     
$new_h = abs($new_w * $aspect_ratio);
    }

   
$img = imagecreatetruecolor($new_w,$new_h);
   
imagecopyresized($img,$src,0,0,0,0,$new_w,$new_h,$width,$height);

   
// determine image type and send it to the client   
   
if ($type == "image/pjpeg") {   
     
imagejpeg($img);
    } else if (
$type == "image/x-png") {
     
imagepng($img);
    } else if (
$type == "image/gif") {
     
imagegif($img);
    }
   
imagedestroy($img);
   
mysql_close($link);
};
?>
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0
adrian_schmidt at yahoo dot com
11 years ago
I'm trying to get the imagecreatefromstring to work with GIFs. Of course, it won't.
I've read the tips but can't get them to work either.
The following is what I tried, based on above tips:

---

    header('Content-Type: image/gif');
    header('Content-Disposition: inline; filename=file.gif');

    $temp = tmpfile();
    fwrite($temp, $line['image']);
    $src_img = imagecreatefromgif($temp);
    fclose($temp); // this removes the file
    $dst_img = imagecreatetruecolor(100, 100);
    imagecopyresampled($dst_img, $src_img, 0,0,0,0, 100,100, imagesx($src_img), imagesy($src_img));
   
    imagegif($dst_img);

---

where $line['image'] is the gif as taken from my MySQL database...

If anyone that has been able to make something like this work could give me a working piece of code I'd be really greatful!

I would be great if the tempfile could be excluded too...

Below is a working piece of code for jpeg:

---

    header('Content-Type: image/jpeg');
    header('Content-Disposition: inline; filename=file.jpg');
   
    $src_img = imagecreatefromstring($line['image']);
    $dst_img = imagecreatetruecolor(100, 100);
    imagecopyresampled($dst_img, $src_img, 0,0,0,0, 100,100, imagesx($src_img), imagesy($src_img));
   
    imagejpeg($dst_img);
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-1
kanzure at gmail dot com
8 years ago
Generating graphs in an external program (in this case, gnuplot) may cause problems. This is a solution hacked together in the late hours of night.

<?php
// get the values from, say, a database
$vals = "1 2\\\\n4 8\\\\n"; # etc
// construct the gnuplot_call variable, something like:
$gnuplot_call = "echo \"set term png; plot '<echo -e \\\"$vals\\\" ' ti 'Updated with' with line ; \" | gnuplot";
ob_start();
passthru($gnuplot_call, $gnuplot_call_output);
$image = imagecreatefromstring(ob_get_contents());
ob_end_clean();
imagepng($image); # display
?>
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-1
logan at logansbailey dot com
5 years ago
So you guys don't spend an hour trying to figure out why your script keeps running out of memory when you're using this or the other imagecreatefrom functions.  GD uncompresses the image when you use these functions, and this can lead to your script running out of memory.

If you download a rawimage save it on your computer to jpeg so the file size comes down, GD will automatically convert it to the raw and you can possibly run out of memory.
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