Php/docs/function.imagegif
imagegif
(PHP 4, PHP 5, PHP 7)
imagegif — Output image to browser or file
Description
imagegif
( resource $image
[, mixed $to = NULL
] ) : bool
imagegif() creates the GIF
file in to from the image image. The
image argument is the return from the
imagecreate() or imagecreatefrom*
function.
The image format will be GIF87a unless the image has been made transparent with imagecolortransparent(), in which case the image format will be GIF89a.
Parameters
image- An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
to- The path or an open stream resource (which is automatically being closed after this function returns) to save the file to. If not set or
NULL, the raw image stream will be outputted directly.
Return Values
Returns TRUE on success or FALSE on failure.
Caution
However, if libgd fails to output the image, this function returns TRUE.
Examples
Example #1 Outputting an image using imagegif()
<?php// Create a new image instance$im = imagecreatetruecolor(100, 100);// Make the background whiteimagefilledrectangle($im, 0, 0, 99, 99, 0xFFFFFF);// Draw a text string on the imageimagestring($im, 3, 40, 20, 'GD Library', 0xFFBA00);// Output the image to browserheader('Content-Type: image/gif');imagegif($im);imagedestroy($im);?>
Example #2 Converting a PNG image to GIF using imagegif()
<?php// Load the PNG$png = imagecreatefrompng('./php.png');// Save the image as a GIFimagegif($png, './php.gif');// Free from memoryimagedestroy($png);// We're doneecho 'Converted PNG image to GIF with success!';?>
Notes
Note:
GIF support was removed from the GD library in Version 1.6, and added back in Version 2.0.28. This function is not available between these versions. For more information, see the » GD Project site.
The following code snippet allows you to write more portable PHP applications by auto-detecting the type of GD support which is available. Replace the sequence
header ("Content-Type: image/gif"); imagegif ($im);by the more flexible sequence:
<?php// Create a new image instance$im = imagecreatetruecolor(100, 100);// Do some image operations here// Handle outputif(function_exists('imagegif')){ // For GIF header('Content-Type: image/gif'); imagegif($im);}elseif(function_exists('imagejpeg')){ // For JPEG header('Content-Type: image/jpeg'); imagejpeg($im, NULL, 100);}elseif(function_exists('imagepng')){ // For PNG header('Content-Type: image/png'); imagepng($im);}elseif(function_exists('imagewbmp')){ // For WBMP header('Content-Type: image/vnd.wap.wbmp'); imagewbmp($im);}else{ imagedestroy($im); die('No image support in this PHP server');}// If image support was found for one of these// formats, then free it from memoryif($im){ imagedestroy($im);}?>
Note:
You can use the function imagetypes() for checking the presence of the various supported image formats:
<?phpif(imagetypes() & IMG_GIF){ header('Content-Type: image/gif'); imagegif($im);}elseif(imagetypes() & IMG_JPG){ /* ... etc. */}?>
See Also
- imagepng() - Output a PNG image to either the browser or a file
- imagewbmp() - Output image to browser or file
- imagejpeg() - Output image to browser or file
- imagetypes() - Return the image types supported by this PHP build
