imagecreatefromgif
(PHP 4, PHP 5)
imagecreatefromgif — Create a new image from file or URL
說明
resource imagecreatefromgif
( string $filename
)
imagecreatefromgif() returns an image identifier representing the image obtained from the given filename.
To ease debugging the following example will produce an error GIF:
Example#1 Example to handle an error during creation
<?php
function LoadGif ($imgname)
{
$im = @imagecreatefromgif ($imgname); /* Attempt to open */
if (!$im) { /* See if it failed */
$im = imagecreatetruecolor (150, 30); /* Create a blank image */
$bgc = imagecolorallocate ($im, 255, 255, 255);
$tc = imagecolorallocate ($im, 0, 0, 0);
imagefilledrectangle ($im, 0, 0, 150, 30, $bgc);
/* Output an errmsg */
imagestring ($im, 1, 5, 5, "Error loading $imgname", $tc);
}
return $im;
}
header("Content-Type: image/gif");
$img = LoadGif("bogus.image");
imagegif($img);
?>
上例的輸出類似於：
Tip
如果「fopen wrappers」已經被啟用，則在本函式中可以把 URL 作為檔案名來使用。請參閱 fopen() 函式來獲取如何指定文件名的詳情以及支援 URL 協定列表：List of Supported Protocols/Wrappers。
參數
- filename
-
Path to the GIF image
Return值
Returns an image resource identifier on success, FALSE on errors.
註釋
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.
Warning
PHP 4.3.0 之前的 Windows PHP版本，即使啟動allow_url_fopen選項，也不支援由此函式存取遠端檔案。