<?php
//小猪会气功
session_start();
session_register('code');
$width = "70";//图片宽
$height = "25";//图片高
$len = "4";//生成几位验证码
$bgcolor = "#ffffff";//背景色
$noise = true;//生成杂点
$noisenum = 200;//杂点数量
$border = false;//边框
$bordercolor = "#000000";
$image = imageCreate($width, $height);
$back = getcolor($bgcolor);
imageFilledRectangle($image, 0, 0, $width, $height, $back);
$size = $width/$len;
if($size>$height) $size=$height;
$left = ($width-$len*($size+$size/10))/$size;
for ($i=0; $i<$len; $i++)
{
$randtext = rand(0, 9);
$code .= $randtext;
$textColor = imageColorAllocate($image, rand(0, 100), rand(0, 100), rand(0, 100));
$font = rand(1,4).".ttf";
$randsize = rand($size-$size/10, $size+$size/10);
$location = $left+($i*$size+$size/10);
imagettftext($image, $randsize, rand(-18,18), $location, rand($size-$size/10, $size+$size/10), $textColor, $font, $randtext);
}
if($noise == true) setnoise();
$_SESSION['code'] = $code;
$bordercolor = getcolor($bordercolor);
if($border==true) imageRectangle($image, 0, 0, $width-1, $height-1, $bordercolor);
header("Content-type: image/png");
imagePng($image);
imagedestroy($image);
function getcolor($color)
{
global $image;
$color = eregi_replace ("^#","",$color);
$r = $color[0].$color[1];
$r = hexdec ($r);
$b = $color[2].$color[3];
$b = hexdec ($b);
$g = $color[4].$color[5];
$g = hexdec ($g);
$color = imagecolorallocate ($image, $r, $b, $g);
return $color;
}
function setnoise()
{
global $image, $width, $height, $back, $noisenum;
for ($i=0; $i<$noisenum; $i++){
$randColor = imageColorAllocate($image, rand(0, 255), rand(0, 255), rand(0, 255));
imageSetPixel($image, rand(0, $width), rand(0, $height), $randColor);
}
}
?>
