php生成gif动画的方法

发布时间：2020-12-12 21:09:19 所属栏目：PHP教程来源：网络整理

导读：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 var $BUF = Array ( ); var $LOP = 0; var $DIS = 2; var $COL = -1; var $IMG = -1; var $ERR = Array ( 'ERR00' ="Does not supported fu

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

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->ERR [ 'ERR02' ],$GIF_mod ); 
            exit    ( 0 ); 
        } 
        if ( substr ( $this->BUF [ $i ],6 ) != "GIF87a" && substr ( $this->BUF [ $i ],6 ) != "GIF89a" ) { 
            printf    ( "%s: %d %s",$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->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 .= "!37713NETSCAPE2.031" . GIFEncoder::GIFWord ( $this->LOP ) . ""; 
    } 
} 
/* 
::::::::::::::::::::::::::::::::::::::::::::::::::: 
:: 
::    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 ],3 * ( 2 << ( ord ( $this->BUF [ 0 ] { 10 } ) & 0x07 ) ) ); 
    $Locals_rgb = substr ( $this->BUF [ $i ],3 * ( 2 << ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 ) ) ); 

    $Locals_ext = "!xF9x04" . chr ( ( $this->DIS << 2 ) + 0 ) . 
                    chr ( ( $d >> 0 ) & 0xFF ) . chr ( ( $d >> 8 ) & 0xFF ) . "x0x0"; 

    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 = "!xF9x04" . 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,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：

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,2,"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：

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);
$color = imagecolorallocate($image,255,255);
$color2 = imagecolorallocate($image,0);

if($pt[$i][1] + $pad_height < $board_width){ 
    imagefilledrectangle($image,$pt[$i][1],$pad_width,$pt[$i][1]+$pad_height,$color); 
}else{ 
    imagefilledrectangle($image,$board_width-$pad_height,$board_width,$color); 
} 
imagefilledrectangle($image,$board_width-$pad_width,$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],$color); 
imagegif($image); 
imagedestroy($image); 
$imagedata[] = ob_get_contents(); 
ob_clean(); 
++$i;

}

$gif = new GIFEncoder(
$imagedata,100,1,"bin"
);

Header ('Content-type:image/gif');
echo $gif->GetAnimation();
?>

以上就是教大家如何利用php合成或是创建gif动画，希望大家仔细研究分享的两个实例，有所收获。

（编辑：李大同）

【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容!