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php?生成验证码

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Release: 2016-06-23 13:25:35
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哪位大哥分享下代码


回复讨论(解决方案)

session_start();$dict = str_split('abcdefghijklmnopqrstuv0123456789');shuffle($dict);$_SESSION['word'] = join('', array_slice($dict, -4));$im = imagecreate(100, 30);$bg = imagecolorallocate($im, 255, 255, 255);$char = imagecolorallocate($im, 0, 0, 0);imagestring($im, 5, 10, 10, $_SESSION['word'], $char);imagegif($im);
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你想要什么样的验证码?
你看看这里吧,可能会对你有所帮助
http://blog.csdn.net/whq19890827/article/details/41778961

	session_start();	$checkCode="";	for($i=0;$i<4;$i++){		$checkCode .=substr('abcdefghijklmnopqrstuvwxyz0123456789', rand(0,35), 1);    // $checkCode.=dechex(rand(1,15));	}	//讲随机验证码保存到session中	$_SESSION['myCheckCode']=$checkCode;	//创建图片,并把随机数画上去	$img=imagecreatetruecolor(100,30);	//背景默认就是黑色	//你可以指定背景颜色	$bgcolor=imagecolorallocate($img,0,0,0);	imagefill($img,0,0,$bgcolor);	//创建新的颜色	$white=imagecolorallocate($img,255,255,255);	$blue=imagecolorallocate($img,0,0,255);	$red=imagecolorallocate($img,255,0,0);	$green=imagecolorallocate($img,255,0,0);	//画出干扰线段	for($i=0;$i<20;$i++){		//更好的方法是颜色随机		imageline($img,rand(0,110),rand(0,30),rand(0,110),rand(0,30),imagecolorallocate($img,rand(0,255),rand(0,255),rand(0,255)));			}	//画出噪点,自己画.		//把四个随机值画上去		imagestring($img,rand(1,5),rand(2,80),rand(2,10),$checkCode,$white);		//如果要使用中文	//array imagefttext (  string $font_file , string $text [, array $extrainfo ] )	//imagettftext($img,15,10,20,25,$white,"STXINWEI.TTF","北京你好");	//输出	header("content-type: image/png");	imagepng($img);
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