请问怎么改验证里面字的大小？
http://pan.baidu.com/share/link?shareid=343815&uk=1865794164 不知道怎么回事上传不了图片，我把图片放百度网盘了。
如上图，请问怎么改验证里面字的大小？
代码如下：
<?php<br />
<br />
session_start();<br />
//session_register('SafeCode');<br />
$type = 'gif';<br />
$width= 92;<br />
$height= 30;<br />
header("Content-type: image/".$type);<br />
srand((double)microtime()*1000000);<br />
$randval = randStr(4,"");<br />
if($type!='gif'&&function_exists('imagecreatetruecolor')){<br />
$im = @imagecreatetruecolor($width,$height);<br />
}else{<br />
$im = @imagecreate($width,$height);<br />
}<br />
$r = Array(225,211,255,223);<br />
$g = Array(225,236,237,215);<br />
$b = Array(225,236,166,125);<br />
$key = rand(0,3);<br />
$backColor = ImageColorAllocate($im,$r[$key],$g[$key],$b[$key]);<br />
$borderColor = ImageColorAllocate($im,0,0,0);<br />
$pointColor = ImageColorAllocate($im,255,170,255);<br />
@imagefilledrectangle($im,0,0,$width -1,$height -1,$backColor);<br />
@imagerectangle($im,0,0,$width-1,$height-1,"");<br />
$stringColor = ImageColorAllocate($im,555,51,153);<br />
for($i=0;$i<=100;$i++){<br />
$pointX = rand(2,$width-2);<br />
$pointY = rand(2,$height-2);<br />
@imagesetpixel($im,$pointX,$pointY,$pointColor);<br />
}<br />
@imagestring($im,10,10,2,$randval,$stringColor);<br />
$ImageFun='Image'.$type;<br />
$ImageFun($im);<br />
@ImageDestroy($im);<br />
$_SESSION['validationcode'] = $randval;<br />
function randStr($len=6,$format='NUMBER') {<br />
switch($format) {<br />
case 'ALL':<br />
$chars='0123456789';break;<br />
case 'CHAR':<br />
$chars='';break;<br />
case 'NUMBER':<br />
$chars='0123456789';break;<br />
default :<br />
$chars='0123456789';<br />
break;<br />
}<br />
$string="";<br />
while(strlen($string)<$len)<br />
$string.=substr($chars,(mt_rand()%strlen($chars)),1);<br />
return $string;<br />
}<br />
;echo ' ';<br />
?>
