<?php
require_once?'string.func.php';
function?verifyImage($type=1,$length=4,$pixel=40,$line=20,$sess_name?=?"verify"){
$sess_name?=?"verify";
session_start();
$width?=?200;
$height?=?100;
$image?=?imagecreatetruecolor($width,?$height);
$white?=?imagecolorallocate($image,255,255,255);
$black?=?imagecolorallocate($image,?0,?0,?0);
imagefilledrectangle($image,?1,?1,$width-2,$height-2,?$white);
$chars?=getString?(?$type,?$length?);
$_SESSION?[$sess_name]?=?$chars;
$fontfiles?=??array("consola.ttf","consolaz.ttf");
for($i?=?0;?$i?<?$length;?$i?++)?{
		$size?=?mt_rand?(?14,?18?);
		$angle?=?mt_rand?(?-?15,?15?);
		$x?=?5?+?$i?*?$size;
		$y?=?mt_rand?(?20,?26?);
		$fontfile?=?"../font/"?.?$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,?$color,?$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?);
}
ob_clean();
verifyImage(3,4,20,11);

字體在font文件中

<?php?
function?getString($type?=?3,$length?=?4){
????if($type?==?1){
????????$chars?=?join("?",range("A",?"Z"));
????}elseif($type?==?2){
????????$chars?=?join("?",range(0,9));
????}elseif($type?==?3){
????????$chars?=?join("?",array_merge(range(0,9),range("A",?"Z"),range("a",?"z")));
????}
???if?($length?>?strlen?(?$chars?))?{
		exit?(?"字符串長度不夠"?);
	}
	$chars?=?str_shuffle?(?$chars?);
	return?substr?(?$chars,?0,?$length?);
}
function?getUniName(){
????return?md5(uniqid(microtime(true),true));
}
function?getExt($filename){
????return?strtolower(end(explode(".",$filename)));
}