仿百度GIF验证码 GIFEncoder 跳动验证码随机背景色、颜色、字体、子大小、偏移、干扰线等...-白红宇

仿百度GIF验证码 GIFEncoder 跳动验证码随机背景色、颜色、字体、子大小、偏移、干扰线等...

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发布时间：2019-06-23

本文共 6949 字，大约阅读时间需要 23 分钟。


    GetAnimation ();function generateGif($str, $length = 4, $width = 60, $height = 22) {	$width = ($length * 10 + 10) > $width ? $length * 10 + 10 : $width;	// 生成一个32帧的GIF动画	for($i = 0; $i < 32; $i ++) {		ob_start ();		$image = imagecreatetruecolor ( $width, $height );		// 背景色		imagefill ( $image, 0, 0, imagecolorallocate ( $image, 255, 255, 255 ) );		// 设定文字随机颜色		$colorList = array (				imagecolorallocate ( $image, 15, 73, 210 ),				imagecolorallocate ( $image, 0, 64, 0 ) 		);		//设定文字随机字体		$fontList = array(				'public/font/msyhbd.ttf',				'public/font/simsun.ttc',				'public/font/arial.ttf'		);		if ($i > 0) { // 屏蔽第一帧			$left = 10;			$top = 15;			for($k = 0; $k < $length; $k ++) {				imagettftext ( $image, 12, mt_rand (0, 10), ($left * $k) + mt_rand ( 0, 15 ), $top + mt_rand ( 0, 10 ), $colorList[array_rand($colorList)], $fontList[array_rand($fontList)], mb_substr ( $str, $k, 1 ) );			}		}		// 添加点点		for($k = 0; $k < 20; $k ++) {			imagesetpixel ( $image, mt_rand () % 50, mt_rand () % 40, $colorList[array_rand($colorList)] );		}		// 添加干扰线		for($k = 0; $k < 3; $k ++) {			if (mt_rand ( 0, 1 )) {				// 直线				imageline ( $image, mt_rand ( 0, $width ), mt_rand ( 0, $height ), mt_rand ( 0, $width ), mt_rand ( 0, $height ), $colorList[array_rand($colorList)] );			} else {				// 弧线				$w = mt_rand ( 0, $width );				$h = mt_rand ( 0, $height );				imagearc ( $image, $width - floor ( $w / 2 ), floor ( $h / 2), $w, $h, mt_rand ( 90, 180 ), mt_rand ( 180, 270 ), $colorList[array_rand($colorList)] );			}		}		imagegif ( $image );		imagedestroy ( $image );		$imagedata [] = ob_get_contents ();		ob_clean ();		++ $i;	}	return $imagedata;}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 .= "!\377\13NETSCAPE2.0\3\1" . GIFEncoder::GIFWord ( $this->LOP ) . "\0";		}	}	function GIFAddFrames($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;	}	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 ));	}	function GetAnimation() {		return ($this->GIF);	}}