(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)



imagecreatefromstring(string $data): GdImage|false

imagecreatefromstring() は、指定した data から 得られたイメージを表すイメージ ID を返します。もし、PHP が JPEG, PNG, GIF, BMP, WBMP, GD2, WEBP をサポートするようビルドされている場合、 イメージの種類は自動的に判別されます。





成功時にはイメージオブジェクトが返されます。 イメージの種類がサポートされていない、データのフォーマットが識別できない、 イメージが壊れておりリロードできないなどの場合は false が返されます。

エラー / 例外

認識できない書式のデータを受け取った場合に、 imagecreatefromstring() は E_WARNING レベルのエラーを発行します。


バージョン 説明
8.0.0 成功時には、この関数は GDImage クラスのインスタンスを返すようになりました。 これより前のバージョンでは、 resource を返していました。
7.3.0 WEBP がサポートされました。 (但し、使っている libgd がサポートしている場合に限ります)

例1 imagecreatefromstring() の例

. 'EX4IJTRkb7lobNUStXsB0jIXIAMSsQnWlsV+wULF4Avk9fLq2r'
. '8a5HSE35Q3eO2XP1A1wQkZSgETvDtKdQAAAABJRU5ErkJggg==';
$data = base64_decode($data);

$im = imagecreatefromstring($data);
if (
$im !== false) {
header('Content-Type: image/png');
else {

上の例の出力は、 たとえば以下のようになります。

出力例 : imagecreatefromstring()


add a note add a note

User Contributed Notes 17 notes

ville dot jungman at gmail dot com
15 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:

= "";
$image = imagecreatefromstring(file_get_contents($src));
php dot net at phor dot net
13 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:

= $imagecreatefromstring($USERFILE);
$valid = ($im != FALSE);
chris at haydenwheeler dot com
4 years ago
imagecreatefromstring does not appear to support WebP images (tested on PHP 7.2.10, with GD 2.1.0 and GD WebP support enabled)
logan at logansbailey dot com
14 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.
anon at dude dot com
7 years ago
[Editor's note: BMP will be supported as of PHP 7.2.0.]

In case it's not obvious from the lack of "imagecreatefrombmp()" in GD, this function cannot handle plain old BMP files either.
junkmail at pmobl dot com
17 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 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),
    } else {
        //if not from a PPC 6700 return data unaltered
         return $data;

Blizzke at gmail dot com
16 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:

// 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.
alexandrebr at ignorethis dot gmail dot com
18 years ago
An easy example to help understanding this function...

$loadFile = "";

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

The function will try to auto-determine file format (jpg, gif, png....), and will return false if fails.
hope at it-helps dot com
12 years ago
Create an image resource from file, without knowing image type:

function imagecreatefromfile($imagepath=false) {
$imagepath || !$is_readable($imagepath) return false;
    return @
not given
20 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.
adeline dot duterre at boxify dot be
3 years ago
Many websites add, during the conversion from .jpg / .png to base64 some words before the base64 string : "data:image/png;base64,"

If you let them, the PHP function will return an error "Data is not in a recognized format in".

If you have this situation :

$image_string = base64_decode($image_string);
$img = imagecreatefromstring($image_string);
paul at epeeps dot net
18 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

Author: Paul Visco
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.
$nokia = new nokia;
$nokia->debug ="y";

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($this->dir_name, 0777);
        //strip out the funk e crap from the file
        //write the file back to itself
        file_put_contents($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
            //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;

nfo[NOSPAM] at safernetworks dot net
15 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.

= "";
$imagedata = GetFileData($sFile); //load the file in 4k chunks
/*=======THE OUTPUT=========*/
// assuming you have image data in $imagedata
$length = strlen($imagedata);
header('Last-Modified: '.date('r'));
header('Accept-Ranges: bytes');
header('Content-Length: '.$length);
header('Content-Type: image/jpeg');
/*======FUNCTIONS USED======*/
function GetFileData($sFilePath){
$fp = fopen($sFilePath, 'rb') or die('404! Unable to open file!');
$buf = '';
$buf .= fgets($fp, 4096);
$buf; //returns False if failed, else the contents up to FileSize bytes.

shiehj at yahoo dot com
20 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


$id = $_GET['id'];

$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);

// determine image type and send it to the client   
if ($type == "image/pjpeg") {   
    } else if (
$type == "image/x-png") {
    } else if (
$type == "image/gif") {
kakail at aei dot ca
17 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)
= "http://bigimage.jpg";//Try with a big image
$im = imagecreatefromstring(file_get_contents($loadFile));

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
kanzure at gmail dot com
17 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.

// 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";
passthru($gnuplot_call, $gnuplot_call_output);
$image = imagecreatefromstring(ob_get_contents());
imagepng($image); # display
adrian_schmidt at yahoo dot com
20 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));


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));
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