/* php生成验证码 */
<?php getCode(200,100);
function getCode($width,$height){ //$width---验证码图片的宽 //$height---验证码图片高 $img=imagecreatetruecolor($width,$height);
$black=imagecolorallocate($img,0,0,0); $white=imagecolorallocate($img,255,255,255); $blue=imagecolorallocate($img,0,0,255); $red=imagecolorallocate($img,255,0,0); $yellow=imagecolorallocate($img,255,255,0); $green=imagecolorallocate($img,0,255,0); imagefill($img,0,0,$white);
for($i==0;$i<5;$i++) { imageline($img,mt_rand(0,$width),mt_rand(0,$height),mt_rand(0,
$width),mt_rand(0,$height),$blue); imageline($img,mt_rand(0,$width),mt_rand(0,$height),mt_rand(0,
$width),mt_rand(0,$height),$red); img_linethick($img,$yellow,$width,$height); img_linethick($img,$green,$width,$height);
}
for($i==0;$i<30;$i++) { imagesetpixel($img,mt_rand(0,$width),mt_rand(0,$height),$black); imagesetpixel($img,mt_rand(0,$width),mt_rand(0,$height),$red); imagesetpixel($img,mt_rand(0,$width),mt_rand(0,$height),$blue); imagesetpixel($img,mt_rand(0,$width),mt_rand(0,$height),$yellow); imagesetpixel($img,mt_rand(0,$width),mt_rand(0,$height),$green); }
shuffle($arr=array_rand(array_flip(array_merge(range(a,z),range(0,9),range (A,Z))),4)); imagestring($img,5,($width/3),($height/2),implode(' ',$arr),$green); header("content-type:image/png"); imagepng($img); imagedestroy($img); }
function img_linethick($img,$color,$width,$height) { //$img---画布资源 //$color---线条颜色 //$width---验证码宽 //$height---验证码高 $ygomx1=mt_rand(4,$width); $ygomy1=mt_rand(4,$height); $ygomx11=$ygomx1; $ygomy11=$ygomy1+2; $ygomx2=mt_rand(4,$width); $ygomy2=mt_rand(4,$height); $ygomx22=$ygomx2; $ygomy22=$ygomy2+2; $point=array( $ygomx1,$ygomy1, $ygomx11,$ygomy11, $ygomx2,$ygomy2, $ygomx22,$ygomy22); imagefilledpolygon($img,$point,4,$color); } ?>
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