最近做了一个小项目，主要是做图片处理，找到了这个类，很实用给大家分享一下。类代码如下。
<?php
//namespace gifCreator;
/**
* Create an animated GIF from multiple images
*/
class gifcreator
{
/**
* @var string The gif string source (old: this->GIF)
*/
private $gif;
/**
* @var string Encoder version (old: this->VER)
*/
private $version;
/**
* @var boolean Check the image is build or not (old: this->IMG)
*/
private $imgBuilt;
/**
* @var array Frames string sources (old: this->BUF)
*/
private $frameSources;
/**
* @var integer Gif loop (old: this->LOP)
*/
private $loop;
/**
* @var integer Gif dis (old: this->DIS)
*/
private $dis;
/**
* @var integer Gif color (old: this->COL)
*/
private $colour;
/**
* @var array (old: this->ERR)
*/
private $errors;
// Methods
// ===================================================================================
/**
* Constructor
*/
public function __construct()
{
$this->reset();
// Static data
$this->version = 'GifCreator: Under development';
$this->errors = array(
'ERR00' => 'Does not supported function for only one image.',
'ERR01' => 'Source is not a GIF image.',
'ERR02' => 'You have to give resource image variables, image URL or image binary sources in $frames array.',
'ERR03' => 'Does not make animation from animated GIF source.',
);
}
/**
* Create the GIF string (old: GIFEncoder)
*
* @param array $frames An array of frame: can be file paths, resource image variables, binary sources or image URLs
* @param array $durations An array containing the duration of each frame
* @param integer $loop Number of GIF loops before stopping animation (Set 0 to get an infinite loop)
*
* @return string The GIF string source
*/
public function create($frames = array(), $durations = array(), $loop = 0)
{
if (!is_array($frames) && !is_array($GIF_tim)) {
throw new \Exception($this->version.': '.$this->errors['ERR00']);
}
$this->loop = ($loop > -1) ? $loop : 0;
$this->dis = 2;
for ($i = 0; $i < count($frames); $i++) {
if (is_resource($frames[$i])) { // Resource var
$resourceImg = $frames[$i];
ob_start();
imagegif($frames[$i]);
$this->frameSources[] = ob_get_contents();
ob_end_clean();
} elseif (is_string($frames[$i])) { // File path or URL or Binary source code
if (file_exists($frames[$i]) || filter_var($frames[$i], FILTER_VALIDATE_URL)) { // File path
$frames[$i] = file_get_contents($frames[$i]);
}
$resourceImg = imagecreatefromstring($frames[$i]);
ob_start();
imagegif($resourceImg);
$this->frameSources[] = ob_get_contents();
ob_end_clean();
} else { // Fail
throw new \Exception($this->version.': '.$this->errors['ERR02'].' ('.$mode.')');
}
if ($i == 0) {
$colour = imagecolortransparent($resourceImg);
}
if (substr($this->frameSources[$i], 0, 6) != 'GIF87a' && substr($this->frameSources[$i], 0, 6) != 'GIF89a') {
throw new \Exception($this->version.': '.$i.' '.$this->errors['ERR01']);
}
for ($j = (13 + 3 * (2 << (ord($this->frameSources[$i] { 10 }) & 0x07))), $k = TRUE; $k; $j++) {
switch ($this->frameSources[$i] { $j }) {
case '!':
if ((substr($this->frameSources[$i], ($j + 3), 8)) == 'NETSCAPE') {
throw new \Exception($this->version.': '.$this->errors['ERR03'].' ('.($i + 1).' source).');
}
break;
case ';':
$k = false;
break;
}
}
unset($resourceImg);
}
if (isset($colour)) {
$this->colour = $colour;
} else {
$red = $green = $blue = 0;
$this->colour = ($red > -1 && $green > -1 && $blue > -1) ? ($red | ($green << 8) | ($blue << 16)) : -1;
}
$this->gifAddHeader();
//d(count($this->frameSources));
for ($i = 0; $i < count($this->frameSources); $i++) {
$this->addGifFrames($i, $durations[$i]);
}
$this->gifAddFooter();
return $this->gif;
}
// Internals
// ===================================================================================
/**
* Add the header gif string in its source (old: GIFAddHeader)
*/
public function gifAddHeader()
{
$cmap = 0;
if (ord($this->frameSources[0] { 10 }) & 0x80) {
$cmap = 3 * (2 << (ord($this->frameSources[0] { 10 }) & 0x07));
$this->gif .= substr($this->frameSources[0], 6, 7);
$this->gif .= substr($this->frameSources[0], 13, $cmap);
$this->gif .= "!\377\13NETSCAPE2.0\3\1".$this->encodeAsciiToChar($this->loop)."\0";
}
}
/**
* Add the frame sources to the GIF string (old: GIFAddFrames)
*
* @param integer $i
* @param integer $d
*/
public function addGifFrames($i, $d)
{
$Locals_str = 13 + 3 * (2 << (ord($this->frameSources[ $i ] { 10 }) & 0x07));
$Locals_end = strlen($this->frameSources[$i]) - $Locals_str - 1;
$Locals_tmp = substr($this->frameSources[$i], $Locals_str, $Locals_end);
$Global_len = 2 << (ord($this->frameSources[0 ] { 10 }) & 0x07);
$Locals_len = 2 << (ord($this->frameSources[$i] { 10 }) & 0x07);
$Global_rgb = substr($this->frameSources[0], 13, 3 * (2 << (ord($this->frameSources[0] { 10 }) & 0x07)));
$Locals_rgb = substr($this->frameSources[$i], 13, 3 * (2 << (ord($this->frameSources[$i] { 10 }) & 0x07)));
$Locals_ext = "!\xF9\x04".chr(($this->dis << 2) + 0).chr(($d >> 0 ) & 0xFF).chr(($d >> 8) & 0xFF)."\x0\x0";
if ($this->colour > -1 && ord($this->frameSources[$i] { 10 }) & 0x80) {
for ($j = 0; $j < (2 << (ord($this->frameSources[$i] { 10 } ) & 0x07)); $j++) {
if (ord($Locals_rgb { 3 * $j + 0 }) == (($this->colour >> 16) & 0xFF) &&
ord($Locals_rgb { 3 * $j + 1 }) == (($this->colour >> 8) & 0xFF) &&
ord($Locals_rgb { 3 * $j + 2 }) == (($this->colour >> 0) & 0xFF)
) {
$Locals_ext = "!\xF9\x04".chr(($this->dis << 2) + 1).chr(($d >> 0) & 0xFF).chr(($d >> 8) & 0xFF).chr($j)."\x0";
break;
}
}
}
switch ($Locals_tmp { 0 }) {
case '!':
$Locals_img = substr($Locals_tmp, 8, 10);
$Locals_tmp = substr($Locals_tmp, 18, strlen($Locals_tmp) - 18);
break;
case ',':
$Locals_img = substr($Locals_tmp, 0, 10);
$Locals_tmp = substr($Locals_tmp, 10, strlen($Locals_tmp) - 10);
break;
}
if (ord($this->frameSources[$i] { 10 }) & 0x80 && $this->imgBuilt) {
if ($Global_len == $Locals_len) {
if ($this->gifBlockCompare($Global_rgb, $Locals_rgb, $Global_len)) {
$this->gif .= $Locals_ext.$Locals_img.$Locals_tmp;
} else {
$byte = ord($Locals_img { 9 });
$byte |= 0x80;
$byte &= 0xF8;
$byte |= (ord($this->frameSources[0] { 10 }) & 0x07);
$Locals_img { 9 } = chr($byte);
$this->gif .= $Locals_ext.$Locals_img.$Locals_rgb.$Locals_tmp;
}
} else {
$byte = ord($Locals_img { 9 });
$byte |= 0x80;
$byte &= 0xF8;
$byte |= (ord($this->frameSources[$i] { 10 }) & 0x07);
$Locals_img { 9 } = chr($byte);
$this->gif .= $Locals_ext.$Locals_img.$Locals_rgb.$Locals_tmp;
}
} else {
$this->gif .= $Locals_ext.$Locals_img.$Locals_tmp;
}
$this->imgBuilt = true;
}
/**
* Add the gif string footer char (old: GIFAddFooter)
*/
public function gifAddFooter()
{
$this->gif .= ';';
}
/**
* Compare two block and return the version (old: GIFBlockCompare)
*
* @param string $globalBlock
* @param string $localBlock
* @param integer $length
*
* @return integer
*/
public function gifBlockCompare($globalBlock, $localBlock, $length)
{
for ($i = 0; $i < $length; $i++) {
if ($globalBlock { 3 * $i + 0 } != $localBlock { 3 * $i + 0 } ||
$globalBlock { 3 * $i + 1 } != $localBlock { 3 * $i + 1 } ||
$globalBlock { 3 * $i + 2 } != $localBlock { 3 * $i + 2 }) {
return 0;
}
}
return 1;
}
/**
* Encode an ASCII char into a string char (old: GIFWord)
*
* $param integer $char ASCII char
*
* @return string
*/
public function encodeAsciiToChar($char)
{
return (chr($char & 0xFF).chr(($char >> 8) & 0xFF));
}
/**
* Reset and clean the current object
*/
public function reset()
{
$this->frameSources;
$this->gif = 'GIF89a'; // the GIF header
$this->imgBuilt = false;
$this->loop = 0;
$this->dis = 2;
$this->colour = -1;
}
// Getter / Setter
// ===================================================================================
/**
* Get the final GIF image string (old: GetAnimation)
*
* @return string
*/
public function getGif()
{
return $this->gif;
}
}
项目引用处理：
//图片资源写入数组，支持如下图片资源。
$frames = array(
imagecreatefrompng("/../images/pic1.png"),
"/../images/pic2.png",
file_get_contents("/../images/pic3.jpg"),
'http://thisisafakedomain.com/images/pic4.jpg',
);
// 设置图片转换快慢，数值越小越快，数组个数和frames对应。
$durations = array(40, 80, 40, 20);
$gc = new GifCreator();
$gc->create($frames, $durations, 5);
//输出方式 浏览器输出
header('Content-type: image/gif');
header('Content-Disposition: filename="butterfly.gif"');
echo $gifBinary;
exit;
//或者 保存gif图片。
file_put_contents('/myfolder/animated_picture.gif', $gifBinary);
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