PHP Australia Conference 2015

imagegif

(PHP 4, PHP 5)

imagegifAffichage de l'image vers le navigateur ou dans un fichier

Description

bool imagegif ( resource $image [, string $filename ] )

imagegif() crée un fichier image GIF avec le nom filename d'après l'image image. L'argument image est un identifiant valide retourné par la fonction imagecreate() ou les fonctions imagecreatefrom*.

Le format de l'image sera GIF87a, à moins que l'image n'ait une couleur transparente (mise en place grâce à la fonction imagecolortransparent())), ce qui fera qu'elle sera au format GIF89a.

Liste de paramètres

image

Une ressource d'image, retournée par une des fonctions de création d'images, comme imagecreatetruecolor().

filename

Le chemin d'enregistrement du fichier. S'il n'est pas défini ou vaut NULL, le flux d'image brute sera affiché directement.

Valeurs de retour

Cette fonction retourne TRUE en cas de succès ou FALSE si une erreur survient.

Exemples

Exemple #1 Affichage d'une image en utilisant imagegif()

<?php
// Création d'une image
$im imagecreatetruecolor(100100);

// Définit l'arrière-plan en blanc
imagefilledrectangle($im0099990xFFFFFF);

// Dessine un texte dans l'image
imagestring($im34020'GD Library'0xFFBA00);

// Affiche l'image sur le navigateur
header('Content-Type: image/gif');

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

Exemple #2 Conversion d'une image PNG en GIF, en utilisant imagegif()

<?php
// Chargement de l'image PNG
$png imagecreatefrompng('./php.png');

// Sauvegarde de l'image en GIF
imagegif($png'./php.gif');

// Libération de la mémoire
imagedestroy($png);

// C'est fait !
echo 'Convertion avec succès de l\'image PNG en GIF !';
?>

Notes

Note:

Le support GIF a été supprimé de la bibliothèque GD en version 1.6 et rajouté en version 2.0.28. Cette fonction n'est donc pas disponible entre des 2 versions. Pour plus d'informations, reportez-vous au site web du » projet GD.

Le code suivant vous permet d'écrire des scripts PHP plus portables : le type de GD est automatiquement détecté. Il remplace la séquence header ("Content-Type: image/gif"); ImageGif($im); par un code plus souple :

<?php
// Création d'une image
$im imagecreatetruecolor(100100);

// On fait quelques opérations sur l'image ici...

// Gestion de l'affichage
if(function_exists('imagegif'))
{
    
// Pour GIF
    
header('Content-Type: image/gif');

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

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

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

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

    die(
'Aucun support sur ce serveur PHP n\'a été trouvé');
}

// Si un support a été trouvé pour un de ces formats,
// nous libérons la mémoire
if($im)
{
    
imagedestroy($im);
}
?>

Note:

Depuis les versions 4.0.2 de PHP, vous pouvez utiliser la fonction imagetypes() au lieu de function_exists() pour vérifier la présence des différents formats d'images supportés.:

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

Voir aussi

  • imagepng() - Envoie une image PNG vers un navigateur ou un fichier
  • imagewbmp() - Affichage de l'image vers le navigateur ou dans un fichier
  • imagejpeg() - Affichage de l'image vers le navigateur ou dans un fichier
  • imagetypes() - Retourne les types d'images supportés par la version courante de PHP

add a note add a note

User Contributed Notes 12 notes

up
8
coldume
1 year ago
To keep GIF animation, you can try the class writing based on GD
GD Enhancer http://www.gdenhancer.com/
up
2
stefan at colulus dot com
6 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
1
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.
4 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
8 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
9 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
9 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
14 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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