<?PHP
header("content-type:image/png");
$num = $_GET['num'];
$imagewidth=60;
$imageheight=18;
srand(microtime() * 100000);
$numimage = imagecreate($imagewidth,$imageheight);
imagecolorallocate($numimage,183,180,83);
for($i=0;$i<strlen($num);$i++){
$font = mt_rand(3,5);
$x = mt_rand(1,8)+$imagewidth*$i/4;
$y = mt_rand(1,$imageheight/3);
$color=imagecolorallocate($numimage,mt_rand(0,50),150),255));
imagestring($numimage,$font,$x,$y,$num[$i],$color);
}
imagepng($numimage);
imagedestroy($numimage);
?>
调用方法：
<?PHP
session_start();
include_once 'conn/conn.PHP';
$pattern = '1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLOMNOPQRSTUVWXYZ';
$num = null;
for($i = 0; $i < 4; $i++) {
$num .= $pattern{mt_rand(0,61)};
}
?>
<div> 验证码：
<input id="lgchk" type="text" />
<img src="valcode.PHP?num=<?PHP echo $num; ?>" width="55" height="18" /> </div>
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