<?php
// PHP验证码图片生成
session_start();
$image = imagecreatetruecolor(100,30);
$bgcolor = imagecolorallocate($image,255,255,255);//#FFFFFFFFFFFF
imagefill($image,0,0,$bgcolor);
$captch_code="";
for ($i=0;$i<4;$i++)
{
$fontsize = 6;
$fontcolor = imagecolorallocate($image,rand(0,120),rand(0,120),rand(0,120));
$data='abcdefghijklmnopqrstuvwxyz1234567890';
$fontcontent=substr($data,rand(0,strlen($data)),1);
$captch_code.="$fontcontent";
$x = ($i * 100/4)+rand(5,10);
$y = rand(5,10);
imagestring($image,$fontsize,$x,$y,$fontcontent,$fontcolor);
}
$_SESSION['code']=$captch_code;
for($i=0;$i<200;$i++)
{
$pointcolor = imagecolorallocate($image,rand(50,200),rand(50,200),rand(50,200));
imagesetpixel($image,rand(1,99),rand(1,29),$pointcolor);
}
for($i=0;$i<5;$i++)
{
$linecolor = imagecolorallocate($image,rand(60,220),rand(60,220),rand(60,220));
imageline($image,rand(1,99),rand(1,29),rand(1,99),rand(1,29),$linecolor);
}
header('content-type: image/png');
imagepng($image);
//销毁
imagedestroy($image);
?>
