PHP使用GIFEncoder类生成的GIF动态图片验证码
发布:smiling 来源: PHP粉丝网 添加日期:2021-03-05 11:55:18 浏览: 评论:0
这篇文章主要介绍了PHP使用GIFEncoder类生成的GIF动态图片验证码,文中附带GIFEncoder类源码,需要的朋友可以参考下。
相信很多人都想过如何用PHP生成GIF动画来实现动态图片验证码,以下是实现过程。
ImageCode函数通过GIFEncoder类实现的GIF动画的PHP源代码,有兴趣的朋友可以研究一下。
代码如下:
- /**
- * ImageCode 生成GIF图片验证
- * @param $string 字符串
- * @param $width 宽度
- * @param $height 高度
- * */
- function ImageCode($string = '', $width = 75, $height = 25)
- {
- $authstr = $string ? $string : ((time() % 2 == 0) ? mt_rand(1000, 9999) : mt_rand(10000, 99999));
- $board_width = $width;
- $board_height = $height;
- // 生成一个32帧的GIF动画
- for($i = 0; $i < 32; $i++)
- {
- ob_start();
- $image = imagecreate($board_width, $board_height);
- imagecolorallocate($image, 0,0,0);
- // 设定文字颜色数组
- $colorList[] = ImageColorAllocate($image, 15,73,210);
- $colorList[] = ImageColorAllocate($image, 0,64,0);
- $colorList[] = ImageColorAllocate($image, 0,0,64);
- $colorList[] = ImageColorAllocate($image, 0,128,128);
- $colorList[] = ImageColorAllocate($image, 27,52,47);
- $colorList[] = ImageColorAllocate($image, 51,0,102);
- $colorList[] = ImageColorAllocate($image, 0,0,145);
- $colorList[] = ImageColorAllocate($image, 0,0,113);
- $colorList[] = ImageColorAllocate($image, 0,51,51);
- $colorList[] = ImageColorAllocate($image, 158,180,35);
- $colorList[] = ImageColorAllocate($image, 59,59,59);
- $colorList[] = ImageColorAllocate($image, 0,0,0);
- $colorList[] = ImageColorAllocate($image, 1,128,180);
- $colorList[] = ImageColorAllocate($image, 0,153,51);
- $colorList[] = ImageColorAllocate($image, 60,131,1);
- $colorList[] = ImageColorAllocate($image, 0,0,0);
- $fontcolor = ImageColorAllocate($image, 0,0,0);
- $gray = ImageColorAllocate($image, 245,245,245);
- $color = imagecolorallocate($image, 255,255,255);
- $color2 = imagecolorallocate($image, 255,0,0);
- imagefill($image, 0, 0, $gray);
- $space = 15; // 字符间距
- if($i > 0) // 屏蔽第一帧
- {
- for ($k = 0; $k < strlen($authstr); $k++)
- {
- $colorRandom = mt_rand(0,sizeof($colorList)-1);
- $float_top = rand(0,4);
- $float_left = rand(0,3);
- imagestring($image, 6, $space * $k, $top + $float_top, substr($authstr, $k, 1), $colorList[$colorRandom]);
- }
- }
- for ($k = 0; $k < 20; $k++)
- {
- $colorRandom = mt_rand(0,sizeof($colorList)-1);
- imagesetpixel($image, rand()%70 , rand()%15 , $colorList[$colorRandom]);
- }
- // 添加干扰线
- for($k = 0; $k < 3; $k++)
- {
- $colorRandom = mt_rand(0, sizeof($colorList)-1);
- // $todrawline = rand(0,1);
- $todrawline = 1;
- if($todrawline)
- {
- imageline($image, mt_rand(0, $board_width), mt_rand(0,$board_height), mt_rand(0,$board_width), mt_rand(0,$board_height), $colorList[$colorRandom]);
- }
- else
- {
- $w = mt_rand(0,$board_width);
- $h = mt_rand(0,$board_width);
- imagearc($image, $board_width - floor($w / 2) , floor($h / 2), $w, $h, rand(90,180), rand(180,270), $colorList[$colorRandom]);
- }
- }
- imagegif($image);
- imagedestroy($image);
- $imagedata[] = ob_get_contents();
- ob_clean();
- ++$i;
- }
- $gif = new GIFEncoder($imagedata);
- Header ('Content-type:image/gif');
- echo $gif->GetAnimation();
- }
GIFEncoder类源码:
- <?php
- 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 );
- }
- }
- ?>
Tags: GIFEncoder GIF动态图片验证
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