imagecreatefromgif()

(PHP 4, PHP 5, PHP 7)

由文件或 URL 创建一个新图象。

说明

imagecreatefromgif(string $filename): resource

imagecreatefromgif()返回一图像标识符，代表了从给定的文件名取得的图像。

如已启用fopen 包装器，在此函数中， URL 可作为文件名。关于如何指定文件名详见fopen()。各种wapper 的不同功能请参见支持的协议和封装协议，注意其用法及其可提供的预定义变量。

参数

$filename

GIF 图像的路径。

返回值

成功后返回图象资源,失败后返回FALSE。

范例

处理创建过程中的错误

<?php
function LoadGif($imgname)
{
    /* Attempt to open */
    $im = @imagecreatefromgif($imgname);
    /* See if it failed */
    if(!$im)
    {
        /* Create a blank image */
        $im = imagecreatetruecolor (150, 30);
        $bgc = imagecolorallocate ($im, 255, 255, 255);
        $tc = imagecolorallocate ($im, 0, 0, 0);
        imagefilledrectangle ($im, 0, 0, 150, 30, $bgc);
        /* Output an error message */
        imagestring ($im, 1, 5, 5, 'Error loading ' . $imgname, $tc);
    }
    return $im;
}
header('Content-Type: image/gif');
$img = LoadGif('bogus.image');
imagegif($img);
imagedestroy($img);
?>

以上例程的输出类似于：

注释

Note:

自 GD 库 1.6 版起所有的 GIF 支持都移除了，又在 GD 库 2.0.28 版起又加了回来。如果使用二者之间版本的 GD 库时本函数不可用。

Warning

Windows 版本的 PHP 在 4.3.0版之前不支持通过此函数访问远程文件，即使已经启用allow_url_fopen.

An updated is_ani based on issues reported here and elsewhere
<?php
function is_ani($filename) {
  if(!($fh = @fopen($filename, 'rb')))
    return false;
  $count = 0;
  //an animated gif contains multiple "frames", with each frame having a 
  //header made up of:
  // * a static 4-byte sequence (\x00\x21\xF9\x04)
  // * 4 variable bytes
  // * a static 2-byte sequence (\x00\x2C) (some variants may use \x00\x21 ?)
  
  // We read through the file til we reach the end of the file, or we've found 
  // at least 2 frame headers
  while(!feof($fh) && $count < 2) {
    $chunk = fread($fh, 1024 * 100); //read 100kb at a time
    $count += preg_match_all('#\x00\x21\xF9\x04.{4}\x00(\x2C|\x21)#s', $chunk, $matches);
  }
  
  fclose($fh);
  return $count > 1;
}
?>

I have written this code to detect if a gif file is animated or not. I thought I would share it :-)
<?php
function is_ani($filename)
{
    $filecontents=file_get_contents($filename);
    $str_loc=0;
    $count=0;
    while ($count < 2) # There is no point in continuing after we find a 2nd frame
    {
        $where1=strpos($filecontents,"\x00\x21\xF9\x04",$str_loc);
        if ($where1 === FALSE)
        {
            break;
        }
        else
        {
            $str_loc=$where1+1;
            $where2=strpos($filecontents,"\x00\x2C",$str_loc);
            if ($where2 === FALSE)
            {
                break;
            }
            else
            {
                if ($where1+8 == $where2)
                {
                    $count++;
                }
                $str_loc=$where2+1;
            }
        }
    }
    if ($count > 1)
    {
        return(true);
    }
    else
    {
        return(false);
    }
}
exec("ls *gif" ,$allfiles);
foreach ($allfiles as $thisfile)
{
    if (is_ani($thisfile))
    {
        echo "$thisfile is animated<BR>\n";
    }
    else
    {
        echo "$thisfile is NOT animated<BR>\n";
    }
}
?>
It could quite easily be modified to count the number of frames if you required.

The version of is_ani that reads the file in 100Kb chunks is flawed as the end of frame marker might be split in between 2 chunks - so be careful.

Hopefully this might save someone a headache when using functions to check for animated GIFs.
I have come across some some GIFs use the a different frame separator sequence, \x00\x21, instead of the official standard \x00\x2C. This seems to be happening with animated GIFs saved in Photoshop CS5, although I'm not quite sure if that's where the issue is originating from.
Anyway, I've been using the pattern:
"#\x00\x21\xF9\x04.{4}\x00(\x2C|\x21)#s"
which seems to cover all GIFs, hopefully without misinterpreting.
Cheers.

Just realised that some of the animated GIFs do not contain GCE (graphic control extension). Here is the refactored is_ani() function:
<?php
/**
 * Detects animated GIF from given file pointer resource or filename.
 *
 * @param resource|string $file File pointer resource or filename
 * @return bool
 */
function is_animated_gif($file)
{
  $fp = null;
  if (is_string($file)) {
    $fp = fopen($file, "rb");
  } else {
    $fp = $file;
    /* Make sure that we are at the beginning of the file */
    fseek($fp, 0);
  }
  if (fread($fp, 3) !== "GIF") {
    fclose($fp);
    return false;
  }
  $frames = 0;
  while (!feof($fp) && $frames < 2) {
    if (fread($fp, 1) === "\x00") {
      /* Some of the animated GIFs do not contain graphic control extension (starts with 21 f9) */
      if (fread($fp, 1) === "\x21" || fread($fp, 2) === "\x21\xf9") {
        $frames++;
      }
    }
  }
  fclose($fp);
  return $frames > 1;
}

If GD doesn't support GIFs & gif2png is not available & you are not an administrator, you can install it in your account like this:
create do.php:
<? 
 global $do;
 passthru($do);
?>
then upload gif2png-2.4.6.tar.gz, unpack and install it:
do.php?do=tar+-xvzf+gif2png-2.4.6.tar.gz
do.php?do=gif2png-2.4.5/configure
do.php?do=make
Then remove all files except gif2png. Don't forget to remove do.php as it is a serious security hole in your system. 
Njoy!
Anze

Since gif support is removed from the more recent GD libraries, you can still use it via an external program.
I've read somewhere about using ImageMagick and I tried myself but it's a quite big package and needs the X11 libs which are not available in some servers.
The other option I found is to use a little prog "gif2png" http://www.tuxedo.org/~esr/gif2png/
to convert gif files to png ones. It works under Unix and dos/win32/winnt and is very straightforward.
If you need to modify an user uploaded gif file to save it into your site just use this:
$path=$_FILES["photo"]["tmp_name"];
passthru("/usr/bin/gif2png -d -O ".$path);
$src_img=imagecreatefrompng( dirname($path)."/".basename($path, ".gif").".png");
This will convert the gif to a png and delete the gif file, then it will open the png with the GDlib so you can perform any operation on it.

A fix for the problem of the current is_ani function is to add the last 20b of the previous frame to the next one:
<?php
function is_ani($filename) {
 if(!($fh = @fopen($filename, 'rb')))
  return false;
 $count = 0;
 //an animated gif contains multiple "frames", with each frame having a
 //header made up of:
 // * a static 4-byte sequence (\x00\x21\xF9\x04)
 // * 4 variable bytes
 // * a static 2-byte sequence (\x00\x2C) (some variants may use \x00\x21 ?)
 // We read through the file til we reach the end of the file, or we've found
 // at least 2 frame headers
 $chunk = false;
 while(!feof($fh) && $count < 2) {
  //add the last 20 characters from the previous string, to make sure the searched pattern is not split.
  $chunk = ($chunk ? substr($chunk, -20) : "") . fread($fh, 1024 * 100); //read 100kb at a time
  $count += preg_match_all('#\x00\x21\xF9\x04.{4}\x00(\x2C|\x21)#s', $chunk, $matches);
 }
 fclose($fh);
 return $count > 1;
}
?>

I hate created an improved version of frank at huddler dot com's is_ani function, which keeps score even between hunks. Hope this helps!
/**
 * Check if the provided file is an animated gif.
 *
 * @param string $fileName
 * @return bool
 */
function isAnimatedGif($fileName)
{
  $fh = fopen($fileName, 'rb');
  if (!$fh) {
    return false;
  }
  $totalCount = 0;
  $chunk = '';
  // An animated gif contains multiple "frames", with each frame having a header made up of:
  // * a static 4-byte sequence (\x00\x21\xF9\x04)
  // * 4 variable bytes
  // * a static 2-byte sequence (\x00\x2C) (some variants may use \x00\x21 ?)
  // We read through the file until we reach the end of it, or we've found at least 2 frame headers.
  while (!feof($fh) && $totalCount < 2) {
    // Read 100kb at a time and append it to the remaining chunk.
    $chunk .= fread($fh, 1024 * 100);
    $count = preg_match_all('#\x00\x21\xF9\x04.{4}\x00(\x2C|\x21)#s', $chunk, $matches);
    $totalCount += $count;
    // Execute this block only if we found at least one match,
    // and if we did not reach the maximum number of matches needed.
    if ($count > 0 && $totalCount < 2) {
      // Get the last full expression match.
      $lastMatch = end($matches[0]);
      // Get the string after the last match.
      $end = strrpos($chunk, $lastMatch) + strlen($lastMatch);
      $chunk = substr($chunk, $end);
    }
  }
  fclose($fh);
  return $totalCount > 1;
}

Using the following script to generate(keep) animated GIF, it fixs GD lib animation problem.
http://www.gdenhancer.com/

I wanted to find out if a GIF is Black & White or Color, but I didn't want to wait around for imagecreatefromgif() to parse a 200k file (about 1 second) to get the color map, so I wrote this function to get a list of all the colors in the GIF. Hope it is useful for you.
<?php
function getGIFColorMap($file)
{
  $fp = fopen($file, 'r');
  $buf = fread($fp, 1024);
  fclose($fp);
   
  // Calculate number of colors
  // buf[10] is the color info byte
  $color_byte = ord($buf[10]);
  $has_color_map = ($color_byte >> 7) & 1;
  $color_res = (($color_byte >> 4) & 7) + 1;
  $bits_per_pixel = ($color_byte & 7) + 1;
  $color_count = 1 << $bits_per_pixel;
   
  if (!$has_color_map) return null;
   
  // buf[13] is the beginning of the color map
  $color_map_index = 13;
  $map = array();
  for ($i=0; $i < $color_count; $i++) {
    $index = $color_map_index + $i*3;
    $r = ord($buf[$index]);
    $g = ord($buf[$index + 1]);
    $b = ord($buf[$index + 2]);
    $map[$i] = array($r, $g, $b);
  }
  return $map;
}
?>

If anyone is looking for the Yamasoft gif conversion utility :
Although Yamasoft's website is long gone, the code can be found on the following websites : 
 http://www.fpdf.org/phorum/read.php?f=1&i=9418&t=7568#9418
http://www.fpdf.org/download/php-gif.zip
http://phpthumb.sourceforge.net/index.php?source=phpthumb.gif.php

thanks yamasoft for the gif to png lib. it works! but, there is one bug. i changed line 1003 to this:
if(isset($this->m_img->m_bTrans) && $this->m_img->m_bTrans && ($nColors > 0)) {
because i was getting an error that m_bTrans is undefined. i think this is because my gif has no transparency. after i updated this line, there were no problems.
thanks!
-j

I just installed gif2png on my server, and it took a little research on my part to figure out that this...
passthru("$path/gif2png -O $image_path/image.gif")
will not work if safe mode is on. If you're on a shared server, it probably is. You don't need to turn safe mode off, however, just set the safe_mode_exec_dir variable in your php.ini file to the directory where you installed gif2png. Then you'll be able to execute the program from your PHP script.

function LoadGif ($imgname) {
  $im = @ImageCreateFromGIF ($imgname); /* Attempt to open */
  if (!$im) { /* See if it failed */
    $im = ImageCreate (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;
}

re: 09-May-2002 11:31
Seems gif2png is no longer at http://www.tuxedo.org/~esr/gif2png/
I found a Win32 version at http://www.r1ch.net/stuff/gif2png/
(for the Unix and source, see http://catb.org/~esr/gif2png/ )
In Win32,
 passthru("gif2png $filename");
works fine if gif2png.exe is in the path.
It will overwrite the file with .png extension, so be careful,or use temp files as in the post referenced above (without the -O; type "gif2png" at the command line for the options).
I had a problem with exceeding the default 30 second execution time limit in PHP, so I added this line
 set_time_limit(0); // some odd gifs take a long time (example, a 25K gif, 700x700, mostly blank)

After hours of search, I've finally found a program which can convert JPG to GIF.
IJG - The Independent JPEG Group's JPEG software
Version 6 which support GIF (read and write with LZW)
and the version 6b which support GIF (write only without LZW)
The name of the file is: jpegsrc.v6.tar.gz

For users who just want GIF read (not write) support but:
1) Don't want to patch GD libs
2) Don't want to recompile something
3) Don't have permissions to install conversion packages
4) Any other reason...
I created a small php script (around 25KB) which lets you load a GIF from a file (you even can specify the image index on animated GIFs) and then convert it to a PNG or BMP file.
If I take one example:
<?
include("gif.php");
$gif = gif_loadFile("./test.gif");
if($gif) {
  // GIF file successfully opened
  if(gif_outputAsPNG($gif, "./test.png")) {
    // Now, just use ImageCreateFromPng...
    $img = ImageCreateFromPng("./test.png");
    if($img) {
      header("Content-Type: image/jpeg");
      ImageJPEG($img);
      ImageDestroy($img);
    }
    else {
      // Could NOT open PNG
    }
  }
  else {
    // Could NOT convert GIF to PNG...
  }
}
else {
  // GIF not loaded...
}
?>
Of course, it's slower than using appropriate software and/or libraries but it's quite useful for reading occasionaly some GIF files.
You'll find the gif.php source code at: http://www.yamasoft.com/php-gif.zip
Fabien

FreeBSD users are lucky to have the option of compiling GIF support in GD2.x through the ports system.
All you need to do is to export the "WITH_LZW=yes" global variable when compiling the graphics/gd2 port, e.g.:
# cd /usr/ports/graphics/gd2
# export WITH_LZW=yes
# make && make install
Then recompile and (re)install the www/mod_php4 port and you are in business... :)
Good luck!

<?php
function myImageCreateFromGif($file_or_url) {
    $dummy_file = "/tmp/dummy.gif";
    # if this is a url, use fopen to get the file data, then 
    # save it to a dummy file
    if (preg_match("/(http|ftp):\/\//i", $file_or_url)) {
        # open the file using fopen, which supports remote URLs
        $input = fopen($file_or_url, "rb");
        # read the contents of the file
        # will accept files up to 10Mb, but will probably get 
        # and EOF before that, we have to do it this way because
        # filesize isn't designed to work with URLs. sigh.
        $image_data = fread($input, 10000000);
        fclose($input);
        # write the contents to a dummy file
        $output = fopen("$dummy_file", "wb");
        fwrite($output, $image_data);
        fclose($output);
        # create the gif from the dummy file
        $image = ImageCreateFromGif($dummy_file);
        # get rid of the dummy file
        unlink($dummy_file);
    }
    # if it's not a URL, we can simply open the image directly
    else {
        $image = ImageCreateFromGif($file_or_url);
    }
    if ($image) { return $image; }
    else { return 0; }
}
if (!$url) { $url = "http://scholar.lib.vt.edu/images/cornholio.gif";}
$image = myImageCreateFromGif($url);
if ($image == "" || $image == 0) {
    print "<p>No Image data was returned...</p>\n";
}
else { 
    header("Content-Type: image/gif\n\n");
    ImageGif($image);
}
?>