php如何生成动画？这篇文章主要介绍了php合成或者创建gif动画，并提供了两个实例。希望对大家有所帮助。
首先需要确认gd库是否正常，如果是合成图片，请确保把分解的图片放在frames的文件夹里面。
gifencoder.class.php 类
<?
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 not supported function for only one image!",
'err01' =>"source is not a gif image!",
'err02' =>"unintelligible flag ",
'err03' =>"could not make animation from animated gif source",
);
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
:: gifencoder...
::
*/
function gifencoder (
$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 = ( 13 + 3 * ( 2 << ( ord ( $this->buf [ $i ] { 10 } ) & 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...
::
*/
function gifaddheader ( ) {
$cmap = 0;
if ( ord ( $this->buf [ 0 ] { 10 } ) & 0x80 ) {
$cmap = 3 * ( 2 << ( ord ( $this->buf [ 0 ] { 10 } ) & 0x07 ) );
$this->gif .= substr ( $this->buf [ 0 ], 6, 7 );
$this->gif .= substr ( $this->buf [ 0 ], 13, $cmap );
$this->gif .= "!\377\13netscape2.0\3\1" . gifencoder::gifword ( $this->lop ) . "\0";
}
}
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
:: gifaddframes...
::
*/
function gifaddframes ( $i, $d ) {
$locals_str = 13 + 3 * ( 2 << ( ord ( $this->buf [ $i ] { 10 } ) & 0x07 ) );
$locals_end = strlen ( $this->buf [ $i ] ) - $locals_str - 1;
$locals_tmp = substr ( $this->buf [ $i ], $locals_str, $locals_end );
$global_len = 2 << ( ord ( $this->buf [ 0 ] { 10 } ) & 0x07 );
$locals_len = 2 << ( ord ( $this->buf [ $i ] { 10 } ) & 0x07 );
$global_rgb = substr ( $this->buf [ 0 ], 13,
3 * ( 2 << ( ord ( $this->buf [ 0 ] { 10 } ) & 0x07 ) ) );
$locals_rgb = substr ( $this->buf [ $i ], 13,
3 * ( 2 << ( ord ( $this->buf [ $i ] { 10 } ) & 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 ] { 10 } ) & 0x80 ) {
for ( $j = 0; $j < ( 2 << ( ord ( $this->buf [ $i ] { 10 } ) & 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 >> 16 ) & 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->buf [ $i ] { 10 } ) & 0x80 && $this->img > -1 ) {
if ( $global_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 ] { 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->buf [ $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->img = 1;
}
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
:: gifaddfooter...
::
*/
function gifaddfooter ( ) {
$this->gif .= ";";
}
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
:: gifblockcompare...
::
*/
function 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...
::
*/
function gifword ( $int ) {
return ( chr ( $int & 0xff ) . chr ( ( $int >> 8 ) & 0xff ) );
}
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
:: getanimation...
::
*/
function getanimation ( ) {
return ( $this->gif );
}
}
?>
为大家分享两个实例供大家参考：
实例 1 合成gif动画：
<?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 binary 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/gif' );
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 ( );
?>
实例 2 创建gif动画：
<?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);
$color2 = imagecolorallocate($image, 255,0,0);
if($pt[$i][1] + $pad_height < $board_width){
imagefilledrectangle($image,0,$pt[$i][1],$pad_width, $pt[$i][1]+$pad_height,$color);
}else{
imagefilledrectangle($image,0,$board_width-$pad_height,$pad_width, $board_width,$color);
}
imagefilledrectangle($image,$board_width-$pad_width,0,$board_width, $board_height,$color2);
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();
?>
相关推荐：
php gd 图像处理组件的常用函数总结
很强的 php 图片处理类
ppt图片透明度 php 图片上添加透明度渐变的效果
以上就是php生成动画实例的详细内容。