php 复杂生成验证码图片_PHP教程

function image3($length=4,$type='png',$width=180,$height=60,$fontface='fpnf.ttf',$verifyName='verify') {
$code = $this->rand_string($length,4);
$width = ($length*25)>$width?$length*25:$width;
$authCode = new Zend_Session_Namespace('Auth_Code');
$authCode->imagecode = $randval;

$im=imagecreatetruecolor($width,$height);
$borderColor = imagecolorallocate($im, 100, 100, 100); //边框色
$bkcolor=imagecolorallocate($im,250,250,250);
imagefill($im,0,0,$bkcolor);
@imagerectangle($im, 0, 0, $width-1, $height-1, $borderColor);
// 干扰
for($i=0;$i $fontcolor=imagecolorallocate($im,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));
imagearc($im,mt_rand(-10,$width),mt_rand(-10,$height),mt_rand(30,300),mt_rand(20,200),55,44,$fontcolor);
}
for($i=0;$i $fontcolor=imagecolorallocate($im,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));
imagesetpixel($im,mt_rand(0,$width),mt_rand(0,$height),$fontcolor);
}
if(!is_file($fontface)) {
$fontface = dirname(__FILE__)."/".$fontface;
}
for($i=0;$i $fontcolor=imagecolorallocate($im,mt_rand(0,120),mt_rand(0,120),mt_rand(0,120)); //这样保证随机出来的颜色较深。
$codex= substr($code,$i,1);
imagettftext($im,mt_rand(16,20),mt_rand(-60,60),40*$i+20,mt_rand(30,35),$fontcolor,$fontface,$codex);
}
$this->output($im,$type);
}

function output($im,$type='png')
{
header("Content-type: image/".$type);
$ImageFun='Image'.$type;
$ImageFun($im);
imagedestroy($im);
}

http://www.bkjia.com/PHPjc/633052.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/633052.htmlTechArticlefunction image3($length=4,$type='png',$width=180,$height=60,$fontface='fpnf.ttf',$verifyName='verify') { $code=$this-rand_string($length,4); $width = ($length*25)$width?$length*25:...