PHP 5.6.0beta1 released

imagegif

(PHP 4, PHP 5)

imagegifBir dosyaya veya tarayıcıya bir GIF resmi çıktılar

Açıklama

bool imagegif ( resource $resim [, string $dosyaismi ] )

imagegif() işlevi resim ile belirtilen resmin GIF biçemlisini oluşturup dosyaismi dosyasına çıktılar. resim değiştirgesi imagecreate() veya imagecreatefrom* işlevleri tarafından oluşturulmuş bir resmi belirtmelidir.

Resmin artalanı imagecolortransparent() ile şeffaf yapılmışsa dosya biçemi GIF89a, aksi takdirde GIF87a'dır.

Değiştirgeler

resim

imagecreatetruecolor() gibi bir resim oluşturma işlevinden dönen bir resim verisi.

dosyaismi

GIF resminin kaydedileceği dosyanın yolu. Belirtilmezse veya NULL verilirse ham resim akımı doğrudan tarayıcıya çıktılanır.

Dönen Değerler

Başarı durumunda TRUE, başarısızlık durumunda FALSE döner.

Örnekler

Örnek 1 - imagegif() ile bir resmi çıktılamak

<?php
// Boş bir resim oluşturalım
$im imagecreatetruecolor(100100);

// Artalan rengi beyaz olsun
imagefilledrectangle($im0099990xFFFFFF);

// Resme bir metin çizelim
imagestring($im34020'GD Library'0xFFBA00);

// Resmi tarayıcıya gönderelim
header('Content-type: image/gif');

imagegif($im);
imagedestroy($im);
?>

Örnek 2 - Bir PNG resmini imagegif() ile bir GIF resmine dönüştürmek

<?php

// Resmi PNG olarak yükleyelim
$png imagecreatefrompng('./php.png');

// Bir GIF olarak kaydedelim
imagegif($png'./php.gif');

// Belleği serbest bırakalım
imagedestroy($png);

// İşimiz bitti
echo 'PNG başarıyla GIF yapıldı!';
?>

Notlar

Bilginize:

GIF desteği GD kütüphanesinin 1.6 sürümünde tamamen kaldırılmış, gd-2.0.28'den itibaren yeniden etkin olmuştur.

Aşağıdaki kod parçası GD desteğinin durumuna bakarak taşınabilir PHP uygulamaları yazmanızı sağlar:

<?php
// Boş bir resim oluşturalım
$im imagecreatetruecolor(100100);

// Resim üzerinde bazı işlemler yapalım

// Resmi çıktılayalım
if(function_exists('imagegif'))
{
    
// GIF için
    
header('Content-type: image/gif');

    
imagegif($im);
}
elseif(
function_exists('imagejpeg'))
{
    
// JPEG için
    
header('Content-type: image/jpeg');

    
imagejpeg($imNULL100);
}
elseif(
function_exists('imagepng'))
{
    
// PNG için
    
header('Content-type: image/png');

    
imagepng($im);
}
elseif(
function_exists('imagewbmp'))
{
    
// WBMP için
    
header('Content-type: image/vnd.wap.wbmp');

    
imagewbmp($im);
}
else
{
    
imagedestroy($im);

    die(
'Bu PHP sunucusunda resim desteği yok');
}

// Resim desteği varsa belleği serbest bırakalım
if($im)
{
    
imagedestroy($im);
}
?>

Bilginize:

PHP 4.0.2'den itibaren desteklenen resim biçemlerini bulmak için function_exists() yerine imagetypes() işlevini kullanabilirsiniz:

<?php
if(imagetypes() & IMG_GIF)
{
    
header('Content-type: image/gif');
    
imagegif($im);
}
elseif(
imagetypes() & IMG_JPG)
{
    
/* ... vb. */
}
?>

Ayrıca Bakınız

  • imagepng() - Tarayıcıya veya bir dosyaya bir PNG resmi çıktılar
  • imagewbmp() - Resmi bir dosyaya veya tarayıcıya çıktılar
  • imagejpeg() - Tarayıcıya veya bir dosyaya bir JPEG resmi çıktılar
  • imagetypes() - Kurulu PHP'nin desteklediği resim türlerini döndürür

add a note add a note

User Contributed Notes 13 notes

up
7
coldume
7 months ago
To keep GIF animation, you can try the class writing based on GD
GD Enhancer http://www.gdenhancer.com/
up
1
stefan at colulus dot com
5 years ago
I worked out a script that allows the transfer of alphanumeric data to be placed on an image. The HTML feature is img src and the php feature is imagettftext. This simple code will increment from 1 to 3 on images.

code:

<?php
//ImageCall.php -- This script will call a script to produce the image.
for($next = 1;$next < 4; $next++){
print
"Image $next:<br>";
print
"<img src = 'Image.php?\$text=$next'>";
print
"<br><br>";
}
?>

<?php
//Image.php -- This script creates a square image and places the text on it.

// image size and color
$im = ImageCreate(77,77);
$color1 = ImageColorAllocate($im,0x66,0xCC,0x00);
$color2 = ImageColorAllocate($im,0x33,0x66,0x00);
$color3 = ImageColorAllocate($im,0x00,0x99,0x00);
$color4 = ImageColorAllocate($im,0x3D,0x3D,0x3D);

// image creation
ImageFilledRectangle($im,1,1,76,76,$color1);
ImageFilledpolygon($im, array (76,1,1,76,76,76),3,$color2);
ImageFilledRectangle($im,5,5,72,72,$color3);

// determine numeric center of image
$size = ImageTTFBBox(45,0,'impact',$_GET['$text']);
$X = (77 - (abs($size[2]- $size[0])))/2;
$Y = ((77 - (abs($size[5] - $size[3])))/2 + (abs($size[5] - $size[3])));

//places numeric information on image
ImageTTFText($im,45,0,($X-1),$Y,$color4,'impact',$_GET['$text']);

//returns completed image to calling script
Header('Content-Type: image/png');
Imagegif($im);

?>
up
0
Anonymous
24 days ago
How to write test on animated gif.
up
0
mail at ignore dot area dot nospam dot joshho dot com
2 years ago
apparently GD does not support animated GIFs.

instead, we're stuck with the old fashioned way:
<?php
header
('Content-Type: image/gif');
echo
file_get_contents($destPathImage);
?>
up
0
grant k.
3 years ago
It should be noted that if you only want to "save" the file, and not display it to the browser, you should catch the imagegif into a variable.

Example:

<?php
//Only saves the file to a destination, no display

$image_value = imagegif($image, $save_file_to_path);

//Saves file and attempts to display it, but will throw an error message

imagegif($image, $save_file_to_path);
   
//Only displays, never saves as a file
imagegif($image);

//Note: In [my] third example, for displaying only, it is probably good to use the "header('Content-type: image/gif'); declaration, but it's not needed in the first example for saving as a .gif file.
?>
up
0
alan hogan dot com slash contact
6 years ago
Note that you *can* save with a transparent color **and dither** using GD2.
For a useful example, see the png-to-gif function in my coment here:
http://www.php.net/manual/en/function.imagecolorat.php
up
0
rokfaith at gmail dot com
7 years ago
to create an animated gif with gifsicle, but without storing temporary images on disk:

<?php
$cmd
= 'gifsicle --loop -O1 --multifile --delay 25 - > '.$outfile;
$desc = array(0 => array("pipe", "r"),1 => array("pipe", "w"),2 => array("pipe", "w"));
$proc = proc_open($cmd, $desc, $pipes);
if (!
is_resource($proc)) {
  die(
'Unable to start gifsicle');
}
for (
$frame=0; $frame<$total_frames; $frame++) {
 
$image = RenderFrame($frame);
 
ob_start();
 
imagegif($image);
 
fwrite($pipes[0], ob_get_contents());
 
ob_end_clean();
 
imagedestroy($image);
}
fclose($pipes[0]);
fclose($pipes[1]);
fclose($pipes[2]);
proc_close($proc);
?>

just define $outfile and RenderFrame(), and that's it.
up
0
Leigh Purdie
8 years ago
Simple animated-gif hack (requires ImageMagick):

<html><body>
<?php
        $icount
=0;
        for(
$count=0;$count<40;$count++) {
               
$im=imagecreate(200,200);
               
imagecolorallocate($im,0,0,255);
               
$white=imagecolorallocate($im,255,255,255);
               
imagerectangle($im,$count,$count,200-$count,200-$count,$white);
               
$icount++;
               
$tcount=sprintf("%04d",$icount);
               
imagegif($im,"/tmp/test-$tcount.gif");
               
imagedestroy($im);
        }
       
exec("/usr/bin/convert -delay 2 -loop 10 /tmp/test*.gif /var/www/html/Tests/Test-Anim.gif");
?>
<img src="/Tests/Test-Anim.gif">
</body>
</html>
up
0
Lauri Harpf
8 years ago
Using <IMG SRC="image.php"> to dynamically generate images is a bit problematic regarding cache. Unless caching is activated, IE seems to get confused about the type of the image when attempting to save it. A .GIF created in the above way causes the browser to suggest saving the image with .BMP, not .GIF.

A solution is to activate cache with session_cache_limiter('public'); in "image.php", after which IE will correctly save as .GIF. If you do not want the cache to block any changes in the dynamic image, make sure that the SRC keeps changing with every reload. Something like "image.php/" . mt_rand(1,100000) . ".gif" seems to work well.

Might be trivial to some, but I spent a couple of hours figuring out why IE always wants to save my dynamic .GIF's as .BMP's.
up
0
jemore at nospam dot m6net dot fr
10 years ago
If you open a truecolor image (with imageCreateFromPng for example), and you save it directly with imagegif, you can have a 500 internal server error. You must use imageTrueColorToPalette to reduce to 256 colors before saving the image in GIF format.
up
0
polone at townnews dot com
12 years ago
read also RFC2557: http://www.ietf.org/rfc/rfc2557.txt
For handling inline images in email.
----


I've been playing around with the "data" URL scheme as proposed by RFC 2397 which states how to perform inline, bas64 encoded images. A number of browsers support this format from some of my tests and would be an interesting way of removing overhead from multiple HTTP connections. Basically, the IMG tag would be:

<IMG SRC="/-/data:image/gif;base64,R0lGODdhMAAwAPAAAAAAAP///ywAAAAAMAAw AAAC8IyPqcvt3wCcDkiLc7C0qwyGHhSWpjQu5yqmCYsapyuvUUlvONmOZtfzgFz ByTB10QgxOR0TqBQejhRNzOfkVJ+5YiUqrXF5Y5lKh/DeuNcP5yLWGsEbtLiOSp a/TPg7JpJHxyendzWTBfX0cxOnKPjgBzi4diinWGdkF8kjdfnycQZXZeYGejmJl ZeGl9i2icVqaNVailT6F5iJ90m6mvuTS4OK05M0vDk0Q4XUtwvKOzrcd3iq9uis F81M1OIcR7lEewwcLp7tuNNkM3uNna3F2JQFo97Vriy/Xl4/f1cf5VWzXyym7PH hhx4dbgYKAAA7" ALT="Larry">

Something like that. Note also that I start the URI with "/-/" before the rest of the data scheme spec. If you don't start it with this, it won't work in a lot of the different browsers I tested (such as IE). Note this is useful for very small images only (as most browsers appear to have a limitation on the size of HTML element data of 1024). Browsers where this syntax worked that I tested are the following:

IE 6.x (windows)
Mozilla 0.97+ (linux)
Opera 5, 6 (windows)
Netscape 4.7+ (mac, windows)
IE 5 (macintosh)

This should work for other image types as well, such as PNG. JPEG files aren't really suggested (usually, these files are too large). BTW - there is no advantage to this method if the image will appear more than ONCE in the page because you will be transmitting the same data multiple times as opposed to just once (most browsers realize that already downloaded data that has multiple references only requires one HTTP call).

Consider using this method if you want to make a single PHP program that outputs both text and an image AND you want to make only on HTTP call. Cheers.
up
0
kremlin at home dot com
13 years ago
Animated GIFs as well as transparent GIFs qualify as GIF89a's and you should use ImageColorTransparent().
up
0
david at hooshla dot com
13 years ago
This is how you load and display an image file:

<?php
Header
("Content-Type: image/gif");
$fn=fopen("./imagefile.gif","r");
fpassthru($fn);
?>

Note that there are no new-lines in the content type header.
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