PHP小项目：轻松创建gif图在线制作网站

各位朋友，大家下午好！

今天给大家带来的教学是 轻松创建gif图在线制作网站！

这里就需要用到一个 GIF动画的PHP类库！

下面我把类库代码分享给大家

由于源码比较长，需要的朋友可以私聊小编哦！

废话不多说，上源码！

namespace GifCreator;

/**

* Create an animated GIF from multiple images

*

* @version 1.0

* @link

* @author Sybio (Clément Guillemain / @Sybio01)

* @license GNU Public License

* @copyright Clément Guillemain

*/

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();

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->encodeAsciiTo char ($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;

}

}