php-验证码
<html><body> <h2>用戶注冊：</h2> <br> <form action="a.php" method="post"> 賬 號：<input type="text" name="zh" id=""> <br> 密 碼：<input type="password" name="mm" id=""> <br> 驗證碼：<input type="text"name="yzm"> <br> <img src="yzm.php"> <br> <input type="submit" value="提交"> <input type="reset" value="重置"> </form></body></html>
//html頁面
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<?php$a = imagecreatetruecolor(100,20);//畫布$black = imagecolorallocate($a,0,0,0);$white = imagecolorallocate($a,255,255,255);$gray = imagecolorallocate($a,200,200,200);$red = imagecolorallocate($a,255,0,0);//顏料 imagefill($a,0,0,$red);//填充for($i=0;$i<20;$i++){$x = mt_rand(0,100);$y = mt_rand(0,20); imagesetpixel($a,$x,$y,$white);imagesetpixel($a,$x,$y+1,$white);imagesetpixel($a,$x,$y+2,$white);imagesetpixel($a,$x,$y-1,$white);imagesetpixel($a,$x,$y-2,$white);imagesetpixel($a,$x+1,$y,$white);imagesetpixel($a,$x+2,$y,$white);imagesetpixel($a,$x-1,$y,$white);imagesetpixel($a,$x-2,$y,$white);}$z1 = range('a','z');$z2 = range('A','Z');$z3 = mt_rand(0,9);$z4 = mt_rand(0,9);imagestring($a,26,25,2,$z1[mt_rand(0,24)],$white);imagestring($a,26,33,2,$z2[mt_rand(0,24)],$white);imagestring($a,26,41,2,$z3,$white);imagestring($a,26,49,2,$z4,$white);header("content-type:image/jpeg");imagepng($a);//保存 imagejpeg($a);//輸出?>//php畫庫
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轉載于:https://www.cnblogs.com/yjh1604600160/p/p-14.html
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