<?php
session_start();
$str = '';
$width = 300;
$height = 100 ;
$img = imagecreatetruecolor($width,$height);
$white = imagecolorallocate($img, 255, 255, 255);
$red = imagecolorallocate ($img, 255, 0, 0);
imagefilledrectangle($img, 0, 0, $width, $height, setColor($img));
function setColor($img )
{
return imagecolorallocate($img,getColor(),getColor(),getColor());
}
function getColor()
{
return mt_rand(0,255);
}
function setNum($a,$b)
{
return mt_rand($a,$b);
}
function getCode()
{
return $string = join( '',array_rand(array_flip(array_merge(范围(0,9),范围('a','z'),范围('A','Z')),4));
}
$str = getCode();
for($i=0;$i<4;$i++)
{
$size = setNum(20,50);
$angle = setNum(-15,15);
$x = ($width/4)*$i+ mt_rand(1,9);
$y = mt_rand(($height/2),$height);
$color = setColor( $img );
$fontfile = './fonts/MSYH.ttf';
$text = mb_substr($str,$i,1,'utf-8');
imagettftext($img, $size, $angle, $x, $y, $color, $fontfile, $text);
}
for($i=0;$i<1500;$i++)
{
imagesetpixel($img, mt_rand(0, $width), mt_rand(0, $height), setColor($img));
}
for($i=0;$i<3;$i++)
{
imageline($img, mt_rand(0, $width), mt_rand(0,$height), mt_rand(0, $width), mt_rand(0,$height), setColor($图像））；
}
for($i=0;$i<3;$i++)
{
$cx = mt_rand(0, $width ）；
$cy = mt_rand(0, $height);
$width = mt_rand(0, $width/2);
$height = mt_rand(0, $高度/2);
$start = mt_rand(0, 360);
$end = mt_rand(0, 360);
$color = setColor($img ）；
imagearc($img, $cx, $cy, $width, $height, $start, $end, $color);
}
$_SESSION['verifycode'] = $str;
header('content-type:image/jpeg');
imagejpeg ( $img );
imagedestroy( $img );
?>
