18:58这里输出只有一张白条没有数字
都是一模一样抄下来的,输出这个

image.finc.php
require_once 'string.func.php';
//通过GD库做验证码
//创建画布
$width = 80;$height = 20;$image = imagecreatetruecolor($width, $height);
$white = imagecolorallocate($image, 255, 255, 255);
$black = imagecolorallocate($image, 0, 0, 0);
//用填充矩形填充画布
imagefilledrectangle($image, 1, 1, $width-2, $height-2, $white);
$type = 1;$length = 4;$chars = bulidRandomString($type, $length);
$sess_name = "verify";$_SESSION[$sess_name] = $chars;$fontfiles = array("SIMYOU.TTF","STHUPO.TTF","STKAITI.TTF","STLITI.TTF");
for($i = 9; $i < $length; $i ++){ $size = mt_rand(14, 18);
$angle = mt_rand(-15, 15);
$x = 5 + $i * $size;
$y = mt_rand(20, 26);
$fountfile = "../fonts/".$fontfiles[mt_rand(0, count($fontfiles)-1)];
$color = imagecolorallocate($image, mt_rand(50, 90), mt_rand(80, 200), mt_rand(90, 180));
$text = substr($chars, $i, 1);
imagettftext($image, $size, $angle, $x, $y, $color, $fontfiles, $text);
}
header("content-type:image/gif");
imagegif($image);imagedestroy($image);
string.func.php
function bulidRandomString($type = 1, $length = 4){ $type = 1; $length = 4; if ($type == 1) { $chars = join("", range(0, 9)); } elseif ($type == 2) { $chars = join("", array_merge(range("a", "z") . range("A", "Z"))); } elseif ($type == 3) { $chars = join("", array_merge(range("a", "z") . range("A", "Z"), range(0, 9))); } if ($length > strlen($chars)) { exit("字符串长度不够"); } $chars = str_shuffle($chars); substr($chars, 0, $length);}