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Website Programming in PHP / MYSQL
imagegif
(PHP 4, PHP 5)
imagegif — Output image to browser or file
Description
imagegif() creates the GIF file in filename 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().
- filename
-
The path 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.
Notes
Note: Since all GIF support was removed from the GD library in version 1.6, this function is not available if you are using that version of the GD library. Support is expected to return in a version subsequent to the rerelease of GIF support in the GD library in mid 2004. 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 ($im); by the more flexible sequence:<?php
if (function_exists("imagegif")) {
header("Content-type: image/gif");
imagegif($im);
} elseif (function_exists("imagejpeg")) {
header("Content-type: image/jpeg");
imagejpeg($im, "", 0.5);
} elseif (function_exists("imagepng")) {
header("Content-type: image/png");
imagepng($im);
} elseif (function_exists("imagewbmp")) {
header("Content-type: image/vnd.wap.wbmp");
imagewbmp($im);
} else {
die("No image support in this PHP server");
}
?>
Note: As of version 3.0.18 and 4.0.2 you can use the function imagetypes() in place of function_exists() for checking the presence of the various supported image formats:
<?php
if (imagetypes() & IMG_GIF) {
header ("Content-type: image/gif");
imagegif ($im);
} elseif (imagetypes() & IMG_JPG) {
/* ... etc. */
}
?>
