PHP生成GIF动态图片验证码
发布:smiling 来源: PHP粉丝网 添加日期:2014-08-18 15:35:44 浏览: 评论:0
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,PHP生成GIF动态图片验证码实例代码如下:
- <?php
- /**
- * 调用示例
- * */
- session_start();
- $randCode = '';
- $chars = 'abcdefghjkmnpqrstuvwxyzABCDEFGHJKLMNPRSTUVWXYZ23456789';
- for ( $i = 0; $i < 4; $i++ )
- {
- $randCode .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
- }
- $_SESSION['code'] = strtoupper($randCode); // 记录session
- ImageCode($randCode, 60); // 显示GIF动画
- /**
- * 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
- * */
- 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 $ERR = Array (
- 'ERR00' =>"Does not supported function for only one image!",
- 'ERR01' =>"Source is not a GIF image!",
- 'ERR02' =>"Unintelligible flag ",
- 'ERR03' =>"Could not make animation from animated GIF source",
- );
- function GIFEncoder ($GIF_src, $GIF_dly = 100, $GIF_lop = 0, $GIF_dis = 0, $GIF_red = 0, $GIF_grn = 0, $GIF_blu = 0, $GIF_mod = 'bin' )
- {
- if (!is_array($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, $src_count = count($GIF_src); $i < $src_count; $i++ )
- {
- if (strToLower( $GIF_mod ) == "url")
- {
- $this->BUF[] = fread (fopen($GIF_src [$i], "rb"), filesize ($GIF_src [$i]));
- }
- elseif(strToLower($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, $count_buf = count($this->BUF); $i < $count_buf; $i++)
- {
- GIFEncoder::GIFAddFrames($i, $GIF_dly[$i]);
- }
- GIFEncoder::GIFAddFooter();
- }
- 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 ) . "";
- }
- }
- 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)));
- $Locals_ext = "!xF9x04" . chr(($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, 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;
- }
- function GIFAddFooter ( ) {
- $this->GIF .= ";";
- }
- 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 );
- }
- function GIFWord ( $int )
- {
- return ( chr ( $int & 0xFF ) . chr ( ( $int >> 8 ) & 0xFF ) );
- }
- //开源代码phpfensi.com
- function GetAnimation ( )
- {
- return ($this->GIF);
- }
- }
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