/* *说明:函数功能是生成验证码 * 参数说明:输入 长度,宽度,高度 */ function vcode($_code_length = 4, $_width = 75, $_height = 25){ $_font=dirname(__FILE__).'/font/Elephant.ttf';//注意字体路径要写对,否则显示不了图片 $_fontsize=$_height/1.8; $_nmsg=""; for($i=0;$i<$_code_length;$i++){ $_nmsg .= dechex(mt_rand(0,15)); } if(!isset($_SESSION)){ session_start(); } $_SESSION["vcode"] = $_nmsg; $_img = imagecreatetruecolor($_width, $_height); $_white = imagecolorallocate($_img, 250, 250, 250); imagefill($_img, 0, 0, $_white); $_gray = imagecolorallocate($_img, 196, 196, 196); imagerectangle($_img, 0, 0, $_width-1, $_height-1, $_gray); for ($i=0; $i < 6; $i++) { $_md_color = imagecolorallocate($_img, mt_rand(200,255), mt_rand(200,255), mt_rand(200,255)); imageline($_img, mt_rand(0,$_width), mt_rand(0, $_height),mt_rand(0,$_width), mt_rand(0, $_height), $_md_color); } for ($i=0; $i < 50; $i++) { $_md_color = imagecolorallocate($_img, mt_rand(200,255), mt_rand(200,255), mt_rand(200,255)); imagestring($_img, 1, mt_rand(1,$_width-5), mt_rand(1, $_height-5), "*", $_md_color); } for ($i=0; $i < $_code_length ; $i++) { $_md_color = imagecolorallocate($_img, mt_rand(0,102), mt_rand(0,102), mt_rand(0,102)); //imagestring($_img, 5, $i * $_width/$_code_length+ mt_rand(1, 10), mt_rand(1, $_height/2), $_SESSION["vcode"][$i], $_md_color); imagettftext($_img,$_fontsize,mt_rand(-20,20),$_fontsize*$i+mt_rand(1,5),$_height / 1.4,$_md_color,$_font,$_SESSION["vcode"][$i]); } header("Content-Type:image/png"); imagepng($_img); imagedestroy($_img); }
需要一个字体文件 可以百度下载一个