php生成扭曲及旋转的验证码图片

<?php function make_rand($length="32"){//验证码文字生成函数 $str="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"; $result=""; for($i=0;$i<$length;$i++){ $num[$i]=rand(0,61); $result.=$str[$num[$i]]; } return $result; } $checkcode = make_rand(5); $im_x=160; $im_y=32; function make_crand($length="5") { $string = ''; for($i=0;$i<$length;$i++) { $string .= chr(rand(0xB0,0xF7)).chr(rand(0xA1,0xFE)); } return $string; } function getAuthImage($text , $im_x = 230 , $im_y = 32) { $im = imagecreatetruecolor($im_x,$im_y); $text_c = ImageColorAllocate($im, mt_rand(0,100),mt_rand(0,100),mt_rand(0,100)); $tmpC0=mt_rand(100,255); $tmpC1=mt_rand(100,255); $tmpC2=mt_rand(100,255); $buttum_c = ImageColorAllocate($im,$tmpC0,$tmpC1,$tmpC2); imagefill($im, 16, 13, $buttum_c); //echo $text; $font = 'c://WINDOWS//Fonts//simsun.ttc'; //echo strlen($text); $text=iconv("gb2312","UTF-8",$text); //echo mb_strlen($text,"UTF-8"); for ($i=0;$i<mb_strlen($text);$i++) { $tmp =mb_substr($text,$i,1,"UTF-8"); $array = array(-1,0,1); $p = array_rand($array); $an = $array[$p]*mt_rand(1,9);//角度 $size = 20; imagettftext($im,$size,$an,10+$i*$size*2,25,$text_c,$font,$tmp); } $distortion_im = imagecreatetruecolor ($im_x, $im_y); imagefill($distortion_im, 16, 13, $buttum_c); for ( $i=0; $i<$im_x; $i++) { for ( $j=0; $j<$im_y; $j++) { $rgb = imagecolorat($im, $i , $j); if( (int)($i+20+sin($j/$im_y*2*M_PI)*10) <= imagesx($distortion_im) && (int)($i+20+sin($j/$im_y*2*M_PI)*10) >=0 ) { imagesetpixel ($distortion_im, (int)($i+10+sin($j/$im_y*2*M_PI-M_PI*0.5)*3) , $j , $rgb); } } } //加入干扰象素; $count = 600;//干扰像素的数量 for($i=0; $i<$count; $i++){ $randcolor = ImageColorallocate($distortion_im,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255)); imagesetpixel($distortion_im, mt_rand()%$im_x , mt_rand()%$im_y , $randcolor); } $line_c=5; //imageline for($i=0; $i < $line_c; $i++) { $linecolor = imagecolorallocate($distortion_im, 17, 158, 20); $lefty = mt_rand(1, $im_x-1); $righty = mt_rand(1, $im_y-1); imageline($distortion_im, 0, $lefty, imagesx($distortion_im), $righty, $linecolor); } Header("Content-type: image/PNG"); //以PNG格式将图像输出到浏览器或文件; //ImagePNG($im); ImagePNG($distortion_im); //销毁一图像,释放与image关联的内存; ImageDestroy($distortion_im); ImageDestroy($im); } ?>

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用法示例如下：

<?phpgetAuthImage(make_crand(5)); ?>