image.func.php

<?php require_once('string.func.php'); function verifyImage( $type=1,$length=4,$pixel=0,$line=0,$sess_name="verify"){ session_start(); $width=80;$height=30;$image=imagecreatetruecolor($width, $height); $white=imagecolorallocate($image, 255, 255, 255);$black=imagecolorallocate($image,0,0,0); imagefilledrectangle($image, 1, 1, $width-2, $height-2, $white); $chars=buildRandomString($type,$length); $_SESSION[$sess_name]=$chars; $fontfiles=array('msyh.ttf','msyhbd.ttf','simsun.ttc','SIMYOU.TTF','STHUPO.TTF','STKAITI.TTF','STLITI.TTF'); for($i=0;$i<$length;$i++){ $size=mt_rand(14,18); $angle=mt_rand(-15,15); $x=5+$i*$size; $y=mt_rand(20,26); $color=imagecolorallocate($image,mt_rand(50,190),mt_rand(50,200),mt_rand(50,90)); $fontfile="../font/".$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($i=0;$i<10;$i++) { $color=imagecolorallocate($image,mt_rand(50,90),mt_rand(50,200),mt_rand(50,90)); imageline($image, mt_rand(0,$width-1), mt_rand(0,$height-1), mt_rand(0,$width-1), mt_rand(0,$height-1), $color);}}header("content-type:image/gif");imagegif($image);imagedestroy($image);}

string.func.php

<?php 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); } ?>