How PHP synthesizes or creates GIF animations

This article mainly introduces PHP synthesis or the method of creating GIF animation, the interested friend's reference, I hope to be helpful to everyone.

First, you need to confirm whether the GD library is normal, if it is a composite picture, make sure to put the exploded image in the frames folder.
GIFEncoder.class.php class

<?        Class Gifencoder {var $GIF = "gif89a";    /* GIF Header 6 bytes */var $VER = "Gifencoder V2.06";     /* Encoder version */var $BUF = Array ();     var $LOP = 0;     var $DIS = 2;     var $COL =-1;      var $IMG =-1;  var $ERR = Array (' ERR00 ' = ' Does ' = ' supported function for only one image! ', ' ERR01 ' = ' and ' Source is ' Not a GIF image! ", ' ERR02 ' =" unintelligible flag ", ' ERR03 ' + ' Could not make animation from Anima      Ted GIF Source ","); * *::--:::::::::::::: Gifencoder,.::::: ":::"-""::: ":".::: "..:::. Coder ($GIF _src, $GIF _dly, $GIF _lop, $GIF _dis, $GIF _red, $GIF _ GRN, $GIF _blu, $GIF _mod) {if (! Is_array ($GIF _src) &&! Is_array ($GIF _tim             ) {printf ("%s:%s", $this->ver, $this->err [' ERR00 ']);  Exit  (0); } $this->lop = ($GIF _lop >-1)?         $GIF _lop:0; $this->dis = ($GIF _dis >-1)?         (($GIF _dis < 3) $GIF _dis:3): 2;                         $this->col = ($GIF _red > 1 && $GIF _grn > 1 && $GIF _blu >-1)? ($GIF _red | ($GIF _grn << 8) | ($GIF _blu << 16))          :-1; for ($i = 0; $i < count ($GIF _src); $i + +) {if (Strtolower ($GIF _mod) = = "url") {$             this->buf [] = Fread (fopen ($GIF _src [$i], "RB"), FileSize ($GIF _src [$i]));             } else if (Strtolower ($GIF _mod) = = "Bin") {$this->buf [] = $GIF _src [$i];  } else {printf ("%s:%s (%s)!", $this->ver, $this->err [' ERR02 '], $GIF _mod                 );             Exit (0); } if (substr ($this->buf [$i], 0, 6)! = "gif87a" && substr ($this->buf [$i], 0, 6)! = "gif89a") {printf ("%s:%d%s", $this->ver, $i, $this->err [' ERR01 ']);             Exit (0); } for ($j = (3 * (2 << (ord ($this->buf [$i] {ten}) & 0x07)), $k = TRUE; $k; $j  + +) {switch ($this->buf [$i] {$j}) {case "!": if (  (substr ($this->buf [$i], ($j + 3), 8) = = "NETSCAPE") {printf ("%s:%s (%s                             SOURCE)! ", $this->ver, $this->err [' ERR03 '], ($i + 1));                         Exit (0);                     } break;                         Case ";": $k = FALSE;                 Break         }}} gifencoder::gifaddheader ();  for ($i = 0; $i < count ($this->buf); $i + +) {gifencoder::gifaddframes ($i, $GIF _dly [$i]);       } gifencoder::gifaddfooter (); }/*::::::::::::::::: Gifaddheader::::-:::---:::::--:::::--:::::.::::.          On Gifaddheader () {$cmap = 0; if (Ord ($this->buf [0] {ten}) & 0x80) {$cmap = 3 * (2 << (ORD) ($this->buf [0] {              ) & 0x07));             $this->gif. = substr ($this->buf [0], 6, 7);             $this->gif. = substr ($this->buf [0], $cmap); $this->gif. = "!\377\13netscape2.0\3\1". Gifencoder::gifword ($this->lop).         "The";     }}///:::::::::::::-----:::-------::::::::::::::: Gifaddframes function Gifaddframes ($i, $d) {$Locals _str = 3 * (2 << (ord ($this->buf [$i] {ten}) &amp ;          0x07));         $Locals _end = strlen ($this->buf [$i])-$Locals _str-1; $Locals _tmp = substr ($thisBUF [$i], $Locals _str, $Locals _end);         $Global _len = 2 << (ord ($this->buf [0] {ten}) & 0x07);          $Locals _len = 2 << (ord ($this->buf [$i] {ten}) & 0x07);  $Global _rgb = substr ($this->buf [0], 3 * (2 << (ord ($this->buf [0] {         ) & 0x07));  $Locals _rgb = substr ($this->buf [$i], 3 * (2 << (ord. $this->buf [$i]          {ten}) & 0x07)); $Locals _ext = "!\xf9\x04".                         Chr (($this->dis << 2) + 0). Chr (($d >> 0) & 0xFF). Chr (($d >> 8) & 0xFF).          "\x0\x0";  if ($this->col >-1 && ord ($this->buf [$i] {ten}) & 0x80) {for ($j = 0; $j < (2 << (ord ($this->buf [$i] {ten}) & 0x07)); $j + +) {if (Ord ($Locals _rgb {3 * $j+ 0}) = = ($this->col >> 0) & 0xFF && ord ($Locals _rgb {3 * $j + 1}) = = ($this->col >> 8) & 0xFF && ord ($Locals _rgb {3 * $j + 2}) = = ($this ->col >> & 0xFF) {$Locals _ext = "!\xf9\x04". Chr ($this-&G                                     T;dis << 2) + 1). Chr (($d >> 0) & 0xFF). Chr (($d >> 8) & 0xFF). Chr ($j).                     "\x0";                 Break }}} switch ($Locals _tmp {0}) {case "!": $Locals _img = subst                 R ($Locals _tmp, 8, 10);                 $Locals _tmp = substr ($Locals _tmp, strlen ($Locals _tmp)-18);             Break                 Case ",": $Locals _img = substr ($Locals _tmp, 0, 10);   $Locals _tmp = substr ($Locals _tmp, ten, strlen ($Locals _tmp)-10);              Break } if (Ord ($this->buf [$i] {ten}) & 0x80 && $this->img >-1) {if ($Globa                     L_len = = $Locals _len) {if (Gifencoder::gifblockcompare ($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->buf [0] {ten}) & 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->buf [$i] {ten}) & 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);     } $this->img = 1; }/*::::::::::::::::: Gifaddfooter::::-:::---:::::--:::::--:::::.::::.     On Gifaddfooter () {$this->gif. = ";"; }/*::::::::::::::::::.:::: Gifblockcompare:::: ":"::: "* * fun".::::..::::    Ction Gifblockcompare ($GlobalBlock, $LocalBlock, $Len) {for ($i = 0; $i < $Len; $i + +) {if                     ($GlobalBlock {3 * $i + 0}! = $LocalBlock {3 * $i + 0} | |                     $GlobalBlock {3 * $i + 1}! = $LocalBlock {3 * $i + 1} | |                   $GlobalBlock {3 * $i + 2}! = $LocalBlock {3 * $i + 2}) {  return (0);     }} return (1); } */*::::::::::::::-::::-:::: Gifword::::::.:::---::::::: "     Fword ($int) {return (Chr ($int & 0xFF). Chr (($int >> 8) & 0xFF)); }/*::::::::::::::::: Getanimation::::-:::---:::::--:::::--:::::.::::.     On Getanimation () {return ($this->gif); }}?>

For everyone to share two examples for your reference:

Example 1 synthetic GIF animations:

<?php include "GIFEncoder.class.php"; /* Build A frames array from sources ... */if ($DH = Opendir ("frames/")) {while (false!== ($dat = Readdir ($ DH)) {if ($dat! = "." && $dat! = "...")       {$frames [] = "frames/$dat";     $framed [] = 5; }} closedir ($DH); }/* Gifencoder constructor: ======================= image_stream = new Gifencoder (URL or Bi         nary data ' Sources ' int ' Delay times ' int ' Animation loops ' int              ' Disposal ' int ' Transparent red, green, blue colors ' int ' Source type ' ); */$gif = new Gifencoder ($frames, $framed, 0, 2, 0, 0, 0, "url"); /* possibles outputs: ================== Output as GIF for browsers:-Header (' Content-type:image/gi     F '); Output as GIF for browsers with filename:-Header (' ConteNt-disposition:attachment;filename=myanimation.gif ');  Output as file to store into a specified file:-FWrite (FOpen ("Myanimation.gif", "WB"), $gif->getanimation ( ) ); */Header (' content-type:image/gif '); echo $gif->getanimation ();?>

Example 2 Creating an animated GIF:

<?php include "GIFEncoder.class.php"; Ob_start (); $board _width = 60; $board _height = 60; $pad _width = 5; $pad _height = 15; $ball _size = 5; $game _width = $board _width-$pad _width*2-$ball _size;  $game _height = $board _height-$ball _size; $x = 0; $y = rand (0, $game _height); $XV = rand (1,10); $YV = rand (1,10); $pt [] = Array ($x, $y);     do{$x + = $XV;     $y + = $yv;         if ($x > $game _width) {$xv = -1* $xv;     $x = $game _width-($x-$game _width);         }elseif ($x < 0) {$XV = -1* $xv;     $x = ABS ($x);         } if ($y > $game _height) {$yv = -1* $yv;     $y = $game _height-($y-$game _height);         }elseif ($y <0) {$yv = -1* $yv;     $y = ABS ($y); } $pt [] = Array ($x, $y); }while ($x! = $pt [0][0]| |  $y! = $pt [0][1]); $i = 0;     while (Isset ($pt [$i])) {$image = Imagecreate ($board _width, $board _height);     Imagecolorallocate ($image, 0,0,0);     $color = Imagecolorallocate ($image, 255,255,255); $color 2 = imagecolorallocate ($image, 255,0,0); if ($pt [$i][1] + $pad _height < $board _width) {imagefilledrectangle ($image, 0, $pt [$i][1], $pad _width, $pt [$i][1]+ $p     Ad_height, $color);     }else{Imagefilledrectangle ($image, 0, $board _width-$pad _height, $pad _width, $board _width, $color);     } imagefilledrectangle ($image, $board _width-$pad _width,0, $board _width, $board _height, $color 2); Imagefilledrectangle ($image, $pad _width+ $pt [$i][0], $ball _size+ $pt [$i][1]-$ball _size, $pad _width+ $pt [$i][0]+ $ball     _size, $ball _size+ $pt [$i][1], $color);     Imagesetpixel ($image, $pt [$i][0], $pt [$i][1], $color);     Imagegif ($image);     Imagedestroy ($image);     $imagedata [] = Ob_get_contents ();     Ob_clean (); + + $i; } $gif = new Gifencoder ($imagedata, 100, 0, 2, 0,      0, 1, "bin"); Header (' content-type:image/gif '); echo $gif->getanimation ();?>

Summary: The above is the entire content of this article, I hope to be able to help you learn.