php实现生成验证码实例分享_php实例
image.func.php
<?php require_once('string.func.php'); function verifyImage( $type=1,$length=4,$pixel=0,$line=0,$sess_name="verify"){ session_start(); /*定义长度和宽度*/ $width=80; $height=30; /* 创建画布*/ $image=imagecreatetruecolor($width, $height); /*本函数用来匹配图形的颜色,供其它绘图函数使用。参数 image 表示图形的 handle。参数 red、green、blue 是色彩三原色,其值从 0 至 255....我在此定义黑色和白色*/ $white=imagecolorallocate($image, 255, 255, 255); $black=imagecolorallocate($image,0,0,0); /*本函数将图片的封闭长方形区域着色。参数 x1、y1 及 x2、y2 分别为矩形对角线的坐标。参数 col 表示欲涂上的颜色*/ imagefilledrectangle($image, 1, 1, $width-2, $height-2, $white); /*buildRandomString函数用来生成一个验证码*/ $chars=buildRandomString($type,$length); /*将验证码给session以便用来判断用户输入是否正确*/ $_SESSION[$sess_name]=$chars; /*定义字体库*/ $fontfiles=array('msyh.ttf','msyhbd.ttf','simsun.ttc','SIMYOU.TTF','STHUPO.TTF','STKAITI.TTF','STLITI.TTF'); /*用循环来将验证码一个一个的写入图片中*/ for($i=0;$i<$length;$i++) { $size=mt_rand(14,18); $angle=mt_rand(-15,15); /*验证码的横坐标与纵坐标*/ $x=5+$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,$i,1); /*本函数将 TTF (TrueType Fonts) 字型文字写入图片*/ imagettftext($image, $size, $angle, $x, $y, $color, $fontfile, $text); } if($pixel) { for($i=0;$i<50;$i++) { /*本函数可在图片上绘出一点。参数 x、y 为欲绘点的坐标,参数 col 表示该点的颜色*/ imagesetpixel($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)); /*画线段*/ imageline($image, mt_rand(0,$width-1), mt_rand(0,$height-1), mt_rand(0,$width-1), mt_rand(0,$height-1), $color); } } /*以gif形式输出*/ header("content-type:image/gif"); /*建立GIF图 并输出到网页*/ imagegif($image); /*释放与 image 关联的内存*/ imagedestroy($image); }
string.func.php
<?php function buildRandomString($type=1,$length=4){ if($type==1) { /*join函数把数组转换为字符串。。join() 函数是 implode() 函数的别名*/ $chars=join("",range(0,9)); }elseif ($type==2) { /*array_merge函数合并数组*/ $chars=join("",array_merge(range("a","z"),range("A","Z"))); }elseif($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"); } /*打乱字符串*/ $chars=str_shuffle($chars); return substr($chars,0,$length); } ?>

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