PHP生成Gif图片验证码_php教程-查字典教程网
PHP生成Gif图片验证码
PHP生成Gif图片验证码
发布时间:2017-01-07 来源:查字典编辑
摘要:先看效果图字体及字体文件的路径需要在类中$FontFilePath及$FontFileName中设置。如:复制代码代码如下:privates...

先看效果图

字体及字体文件的路径需要在类中$FontFilePath及$FontFileName中设置。如:

复制代码 代码如下:

private static $FontFilePath = "static/font/"; //相对地本代码文件的位置

private static $FontFileName = array("3.ttf");// array("1.ttf", "2.ttf", "3.ttf", "4.ttf", "5.ttf", "6.ttf", "7.ttf", "8.ttf"); //

完整代码如下:

复制代码 代码如下:

<?PHP

/**

说明: 验证码生成类,支持生成Gif图片验证码(带噪点,干扰线,网格,随机色背景,随机自定义字体,倾斜,Gif动画)

服务端:

$mod = strtolower(isset($_REQUEST["mod"]) ? $_REQUEST["mod"] : "");

if($mod == "code"){

echo SecurityCode::Draw(4, 1, 120, 30, 5, 10, 100, "secode");

die();

}

调用: <img src="http://www.jb51.netgetcode.php?mod=code">

验证:

$reqCode = strtolower(isset($_REQUEST["secode"]) ? $_REQUEST["secode"] : ""); //请求的验证码

$sessionCode = strtolower(isset($_SESSION["secode"]) ? $_SESSION["secode"] : ""); //会话生成的验证码

if($reqCode != $sessionCode){

echo "安全验证码错误!";

die();

}

*/

$mod = strtolower(isset($_REQUEST["mod"]) ? $_REQUEST["mod"] : "");

if ($mod == "code") {

echo SecurityCode::Draw(4, 15, 100, 27, 10, 2, 100, "secode");

die();

}

//安全验证码类

class SecurityCode {

private static $Debug = 0;

private static $Code = '';

private static $Chars = 'bcdefhkmnrstuvwxyABCDEFGHKMNPRSTUVWXY34568';

//private static $Chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890';

private static $TextGap = 20;

private static $TextMargin = 5;

private static $FontFilePath = "static/font/"; //相对地本代码文件的位置

private static $FontFileName =array("3.ttf");// array("1.ttf", "2.ttf", "3.ttf", "4.ttf", "5.ttf", "6.ttf", "7.ttf", "8.ttf"); //

private static $Img = 'GIF89a'; //GIF header 6 bytes

private static $BUF = Array();

private static $LOP = 0;

private static $DIS = 2;

private static $COL = -1;

private static $IMG = -1;

/**

生成GIF图片验证

@param int $L 验证码长度

@param int $F 生成Gif图的帧数

@param int $W 宽度

@param int $H 高度

@param int $MixCnt 干扰线数

@param int $lineGap 网格线间隔

@param int $noisyCnt 澡点数

@param int $sessionName 验证码Session名称

*/

public static function Draw($L = 4, $F = 1, $W = 150, $H = 30, $MixCnt = 2, $lineGap = 0, $noisyCnt = 10, $sessionName = "Code") {

ob_start();

ob_clean();

for ($i = 0; $i < $L; $i++) {

self::$Code .= SubStr(self::$Chars, mt_rand(0, strlen(self::$Chars) - 1), 1);

}

if (!isset($_SESSION))

session_start();

$_SESSION[$sessionName] = strtolower(self::$Code);

$bgRGB = array(rand(0, 255), rand(0, 255), rand(0, 255));

//生成一个多帧的GIF动画

for ($i = 0; $i < $F; $i++) {

$img = ImageCreate($W, $H);

//背景色

$bgColor = imagecolorallocate($img, $bgRGB[0], $bgRGB[1], $bgRGB[2]);

ImageColorTransparent($img, $bgColor);

unset($bgColor);

//添加噪点

$maxNoisy = rand(0, $noisyCnt);

$noisyColor = imagecolorallocate($img, rand(0, 255), rand(0, 255), rand(0, 255));

for ($k = 0; $k <= $maxNoisy; $k++) {

imagesetpixel($img, rand(0, $W), rand(0, $H), $noisyColor);

}

//添加网格

if ($lineGap > 0) {

for ($m = 0; $m < ($W / $lineGap); $m++) { //竖线

imageline($img, $m * $lineGap, 0, $m * $lineGap, $H, $noisyColor);

}

for ($n = 0; $n < ($H / $lineGap); $n++) { //横线

imageline($img, 0, $n * $lineGap, $W, $n * $lineGap, $noisyColor);

}

}

unset($noisyColor);

// 添加干扰线

for ($k = 0; $k < $MixCnt; $k++) {

$wr = mt_rand(0, $W);

$hr = mt_rand(0, $W);

$lineColor = imagecolorallocate($img, rand(0, 255), rand(0, 255), rand(0, 255));

imagearc($img, $W - floor($wr / 2), floor($hr / 2), $wr, $hr, rand(90, 180), rand(180, 270), $lineColor);

unset($lineColor);

unset($wr, $hr);

}

//第一帧忽略文字

if ($i != 0 || $F <= 1) {

//文字

$foreColor = imagecolorallocate($img, rand(0, 255), rand(0, 255), rand(0, 255));

for ($j = 0; $j < $L; $j++) {

$fontFile = self::$FontFilePath . self::$FontFileName[rand(0, count(self::$FontFileName) - 1)];

if (!file_exists($fontFile))

imagestring($img, 4, self::$TextMargin + $j * self::$TextGap, ($H - rand($H / 2, $H)), self::$Code[$j], $foreColor);

else

imageTTFtext($img, rand(15, 18), rand(-15, 15), self::$TextMargin + $j * self::$TextGap, ($H - rand(7, 10)), $foreColor, $fontFile, self::$Code[$j]);

}

unset($foreColor);

}

ImageGif($img);

Imagedestroy($img);

$Imdata[] = ob_get_contents();

OB_clean();

}

unset($W, $H, $B);

if (self::$Debug) {

echo $_SESSION['code'];

echo '<pre>', Var_Dump($Imdata), '</pre>';

die();

}

header('Content-type:image/gif');

return self::CreateGif($Imdata, 20);

unset($Imdata);

}

private static function CreateGif($GIF_src, $GIF_dly = 10, $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)) {

throw New Exception('Error:' . __LINE__ . ',Does not supported function for only one image!!');

die();

}

self::$LOP = ($GIF_lop > -1) ? $GIF_lop : 0;

self::$DIS = ($GIF_dis > -1) ? (($GIF_dis < 3) ? $GIF_dis : 3) : 2;

self::$COL = ($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') {

self::$BUF[] = fread(fopen($GIF_src[$i], 'rb'), filesize($GIF_src[$i]));

} elseif (strToLower($GIF_mod) == 'bin') {

self::$BUF[] = $GIF_src[$i];

} else {

throw New Exception('Error:' . __LINE__ . ',Unintelligible flag (' . $GIF_mod . ')!');

die();

}

if (!(Substr(self::$BUF[$i], 0, 6) == 'GIF87a' Or Substr(self::$BUF[$i], 0, 6) == 'GIF89a')) {

throw New Exception('Error:' . __LINE__ . ',Source ' . $i . ' is not a GIF image!');

die();

}

for ($j = (13 + 3 * (2 << (ord(self::$BUF[$i]{10}) & 0x07))), $k = TRUE; $k; $j++) {

switch (self::$BUF[$i]{$j}) {

case '!':

if ((substr(self::$BUF[$i], ($j + 3), 8)) == 'NETSCAPE') {

throw New Exception('Error:' . __LINE__ . ',Could not make animation from animated GIF source (' . ($i + 1) . ')!');

die();

}

break;

case ';':

$k = FALSE;

break;

}

}

}

self::AddHeader();

for ($i = 0, $count_buf = count(self::$BUF); $i < $count_buf; $i++) {

self::AddFrames($i, $GIF_dly);

}

self::$Img .= ';';

return (self::$Img);

}

private static function AddHeader() {

$i = 0;

if (ord(self::$BUF[0]{10}) & 0x80) {

$i = 3 * (2 << (ord(self::$BUF[0]{10}) & 0x07));

self::$Img .= substr(self::$BUF[0], 6, 7);

self::$Img .= substr(self::$BUF[0], 13, $i);

self::$Img .= "!37713NETSCAPE2.031" . chr(self::$LOP & 0xFF) . chr((self::$LOP >> 8) & 0xFF) . "";

}

unset($i);

}

private static function AddFrames($i, $d) {

$L_str = 13 + 3 * (2 << (ord(self::$BUF[$i]{10}) & 0x07));

$L_end = strlen(self::$BUF[$i]) - $L_str - 1;

$L_tmp = substr(self::$BUF[$i], $L_str, $L_end);

$G_len = 2 << (ord(self::$BUF[0]{10}) & 0x07);

$L_len = 2 << (ord(self::$BUF[$i]{10}) & 0x07);

$G_rgb = substr(self::$BUF[0], 13, 3 * (2 << (ord(self::$BUF[0]{10}) & 0x07)));

$L_rgb = substr(self::$BUF[$i], 13, 3 * (2 << (ord(self::$BUF[$i]{10}) & 0x07)));

$L_ext = "!xF9x04" . chr((self::$DIS << 2) + 0) . chr(($d >> 0) & 0xFF) . chr(($d >> 8) & 0xFF) . "x0x0";

if (self::$COL > -1 && ord(self::$BUF[$i]{10}) & 0x80) {

for ($j = 0; $j < (2 << (ord(self::$BUF[$i]{10}) & 0x07)); $j++) {

if (ord($L_rgb{3 * $j + 0}) == (self::$COL >> 0) & 0xFF && ord($L_rgb{3 * $j + 1}) == (self::$COL >> 8) & 0xFF && ord($L_rgb{3 * $j + 2}) == (self::$COL >> 16) & 0xFF) {

$L_ext = "!xF9x04" . chr((self::$DIS << 2) + 1) . chr(($d >> 0) & 0xFF) . chr(($d >> 8) & 0xFF) . chr($j) . "x0";

break;

}

}

}

switch ($L_tmp{0}) {

case '!':

$L_img = substr($L_tmp, 8, 10);

$L_tmp = substr($L_tmp, 18, strlen($L_tmp) - 18);

break;

case ',':

$L_img = substr($L_tmp, 0, 10);

$L_tmp = substr($L_tmp, 10, strlen($L_tmp) - 10);

break;

}

if (ord(self::$BUF[$i]{10}) & 0x80 && self::$IMG > -1) {

if ($G_len == $L_len) {

if (self::Compare($G_rgb, $L_rgb, $G_len)) {

self::$Img .= ($L_ext . $L_img . $L_tmp);

} else {

$byte = ord($L_img{9});

$byte |= 0x80;

$byte &= 0xF8;

$byte |= (ord(self::$BUF[0]{10}) & 0x07);

$L_img{9} = chr($byte);

self::$Img .= ($L_ext . $L_img . $L_rgb . $L_tmp);

}

} else {

$byte = ord($L_img{9});

$byte |= 0x80;

$byte &= 0xF8;

$byte |= (ord(self::$BUF[$i]{10}) & 0x07);

$L_img{9} = chr($byte);

self::$Img .= ($L_ext . $L_img . $L_rgb . $L_tmp);

}

} else {

self::$Img .= ($L_ext . $L_img . $L_tmp);

}

self::$IMG = 1;

}

private static function Compare($G_Block, $L_Block, $Len) {

for ($i = 0; $i < $Len; $i++) {

if ($G_Block{3 * $i + 0} != $L_Block{3 * $i + 0} || $G_Block{3 * $i + 1} != $L_Block{3 * $i + 1} || $G_Block{3 * $i + 2} != $L_Block{3 * $i + 2}) {

return (0);

}

}

return (1);

}

}

用法在类开头的注释里。

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