<?php 
	session_start(); 
	header("content-type: image/png"); 
	$str = "的一是在了不和有大这主中人上为们地个用工时要动国产以我到绳穷塘燥泡袋朗喂铝软渠颗惯贸粪综墙趋彼届墨碍启逆卸航雾冠丙街莱"; 
	$imgwidth = 110; 
	$imgheight = 24; 
	$authimg = imagecreate($imgwidth,$imgheight); 
	$bgcolor = imagecolorallocate($authimg,255,255,255); 
	$fontfile = "wrzc_net.ttf"; 
	$white=imagecolorallocate($authimg,234,185,95); 
	imagearc($authimg, 150, 8, 20, 20, 75, 170, $white); 
	imagearc($authimg, 100, 7,50, 22, 75, 175, $white); 
	imageline($authimg,20,20,180,30,$white); 
	imageline($authimg,20,18,170,50,$white); 
	imageline($authimg,25,50,80,50,$white); 
	$noise_num = 100; 
	$line_num = 5; 
	imagecolorallocate($authimg,0xff,0xff,0xff); 
	$rectangle_color=imagecolorallocate($authimg,0xaa,0xaa,0xaa); 
	$noise_color=imagecolorallocate($authimg,0x33,0x33,0x33); 
	$font_color=imagecolorallocate($authimg,0x00,0x00,0x00); 
	$line_color=imagecolorallocate($authimg,0x00,0x00,0x00); 
	for($i=0;$i<$noise_num;$i++){ 
	 imagesetpixel($authimg,mt_rand(0,$imgwidth),mt_rand(0,$imgheight),$noise_color); 
	} 
	for($i=0;$i<$line_num;$i++){ 
	 imageline($authimg,mt_rand(0,$imgwidth),mt_rand(0,$imgheight),mt_rand(0,$imgwidth),mt_rand(0,$imgheight),$line_color); 
	}//开源代码phprm.com 
	$randnum=rand(0,strlen($str)-4); 
	if($randnum%2)$randnum+=1; 
	$str = substr($str,$randnum,8); 
	$_session['supdesverify'] = $str; 
	$str = iconv("gb2312","utf-8",$str); 
	imagettftext($authimg, 20, 0, 0, 21, $font_color, $fontfile, $str); 
	imagepng($authimg); 
	imagedestroy($authimg); 
	 

教程链接:http://www.phprm.com/tuxiang/fs4437.html

随意转载~但请保留教程地址★