验证码图片出来了 数字不出来怎么回事啊
<?php
// 通过GD库做验证码
require_once 'string.func.php';
function verifyImage($type=1,$length=4,$pixel=0,$line=0,$sess_name = "verify")//sess_name:验证码的名字
{
session_start();
// 创建画布
$width = 200;
$height = 100;
$image = imagecreatetruecolor($width, $height);
$white = imagecolorallocate($image, 255, 255, 255);
$black = imagecolorallocate($image, 0, 0, 0);
// 画一个矩形并填充
imagefilledrectangle($image, 1, 1, $width - 2, $height - 2, $white);
$chars = buildRandomString($type, $length);
$_SESSION[$sess_name] = $chars;
$fontfiles = array(
"FZTJLSJW.TTF",
"MSYH.TTF",
"MSYHBD.TTF",
"SIMFANG.TTF",
"SIMSUN.TTC"
);
for ($i = 0; $i < $length; $i ++) {
$size = mt_rand(14, 18);
$angle = mt_rand(- 15, 15);
$x = 5 + $i * $size;
$y = mt_rand(20, 26);
$color = imagecolorallocate ( $image, mt_rand ( 50, 90 ), mt_rand ( 80, 200 ), mt_rand ( 90, 180 ) );
$fontfile = "../fonts/" . $fontfiles[mt_rand(0, count($fontfiles) - 1)];
$text = substr($chars, $i, 1);
imagettftext($image, $size, $angle, $x, $y, $color, $fontfile, $text);
}
if ($pixel) {
for ($i = 0; $i < 50; $i ++) {
imagesetpixel($image, mt_rand(0, $width - 1), mt_rand(0, $height - 1), $black);
}
}
if ($line) {
for ($i = 1; $i < $line; $i ++) {
$color = imagecolorallocate($image, mt_rand(50, 90), mt_rand(80, 200), mt_rand(90, 180));
imageline ( $image, mt_rand ( 0, $width - 1 ), mt_rand ( 0, $height - 1 ), mt_rand ( 0, $width - 1 ), mt_rand ( 0, $height - 1 ), $color );
}
}
ob_clean();
header ( "content-type:image/gif" );
imagegif($image);
imagedestroy($image);
}
verifyImage(1,4,5,10,5);
<?php
/**
* 生成验证码
* @param number $type
* @param number $length
* @return string
*/
function buildRandomString($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);
return substr($chars, 0, $length);
}
