php 验证码图片程序
<?php
/*
*文件名:class.safeCode.php
*类名:safeCode
*目的:生成web应用时所需的验证码图片
*当前版本:1.0.2
*作者:NoAngels
*联系方式:flare_1023@163.com QQ:82535599 MSN:atizu@hotmail.com
*更新内容:
*版本1.0.2
*1.更新了对linux主机支持,设置GDFONTPATH环境变量,
* putenv('GDFONTPATH=' . realpath('.'));
*2.对不支持antialias函数的时候避免采用此方法,避免低版本的GD库
*版本1.0.1
*1.更新了绘制指定类型图片,支持类型有:png,jpeg,gif.默认为png(此效果最佳)
*2.优化了部分代码
*/
class safeCode {
function __construct() {
//设置默认safe安全保护码
$this->__safe = substr(md5(time()) , 0, 4);
}
function __destruct() {
//释放资源
unset($this->__img, $this->__canvasWidth, $this->__canvasHeight, $this->__codeLength, $this->__spacePerChar, $this->__code, $this->__safe, $this->__background, $this->__borderColor, $this->__colors, $this->__font, $this->__sessionName);
}
function setCanvas($width = 200, $height = 60) {
//设置画布宽度以及高度.有默认值
$this->__canvasWidth = $width;
$this->__canvasHeight = $height;
$this->__img = imagecreatetruecolor($width, $height);
return;
}
function setSafe($char) {
//设置安全码,不调用系统会自己设置
$this->__safe = $char;
return;
}
function setCodeLength($num = 8) {
//设置验证码长度
$this->__codeLength = $num;
}
function setFont($fontName) {
//设置绘图时所用的字体,字体文件必须与类文件同目录
$this->__font = $fontName;
return;
}
function setBackground($arg1 = 255, $arg2 = 255, $arg3 = 255) {
//设置背景颜色
$this->__background = imagecolorallocate($this->__img, $arg1, $arg2, $arg3);
return;
}
function setBorderColor($arg1 = 128, $arg2 = 128, $arg3 = 128) {
//设置边框颜色
$this->__borderColor = imagecolorallocate($this->__img, $arg1, $arg2, $arg3);
}
function setFontColor($arr) {
//设置绘图时所用颜色,参数为颜色集合数组
foreach ($arr as $color) {
$this->__colors[] = imagecolorallocate($this->__img, $color[0], $color[1], $color[2]);
}
return;
}
function setSession($sessionName = 'safeCode') {
//设置session变量名,默认为$_SESSION['safeCode']
$this->__sessionName = $sessionName;
//$_SESSION[$sessionName] = $this->__code;
return;
}
function display($type = 'png') {
//显示图片,可指定显示类型,目前支持png(默认),jpeg,gif
$this->__setSpacePerChar();
imagefilledrectangle($this->__img, 1, 1, $this->__canvasWidth - 2, $this->__canvasHeight - 2, $this->__background);
imagerectangle($this->__img, 0, 0, $this->__canvasWidth - 1, $this->__canvasHeight - 1, $this->__borderColor);
$this->__drawText($this->__colors, $this->__getCode() , $this->__font);
//修正linux以及低版本的GD库问题
if (function_exists(imageantialias)) {
imageantialias($this->__img, true);
}
$_SESSION[$this->__sessionName] = $this->__code;
switch ($type) {
case 'png':
header('Content-type:image/png');
imagepng($this->__img);
case 'jpeg':
header('Content-type:image/jpeg');
imagejpeg($this->__img, '', 75);
case 'gif':
header('Content-type:image/gif');
imagegif($this->__img);
default:
header('Content-type:image/png');
imagepng($this->__img);
}
imagegif($this->__img);
}
private function __setSpacePerChar() {
//私有函数,设置字符间隔
$this->__spacePerChar = $this->__canvasWidth / $this->__codeLength;
return;
}
private function __getCode() {
//获取验证码
$this->__code = substr(md5(time() . $this->__safe) , rand(0, 24) , $this->__codeLength);
return $this->__code;
}
private function __drawText($colors, $code, $fontName) {
//开始绘图
//设置GBFONTPATH为当前目录,不然linux环境下会报错
putenv('GDFONTPATH=' . realpath('.'));
for ($i = 0; $i < strlen($code); $i++) {
$color = $colors[$i % count($colors) ];
imagettftext($this->__img, 24 + rand(0, 8) , -20 + rand(0, 40) , ($i + 0.3) * $this->__spacePerChar, $this->__canvasHeight - 20 + rand(0, 20) , $color, $fontName, $code{$i});
}
//绘制随机实线
for ($i = 0; $i < 400; $i++) {
$x1 = rand(5, $this->__canvasWidth - 5);
$y1 = rand(5, $this->__canvasHeight - 5);
$x2 = $x1 - 4 + rand(0, 8);
$y2 = $y1 - 4 + rand(0, 8);
imageline($this->__img, $x1, $y1, $x2, $y2, $this->__colors[rand(0, count($this->__colors) - 1) ]);
}
return;
} //开源代码phprm.com
private $__img = NULL;
private $__canvasWidth = 120;
private $__canvasHeight = 80;
private $__codeLength = 8;
private $__spacePerChar = 0;
private $__code = 12345678;
private $__safe = 2008;
private $__background = NULL;
private $__borderColor = NULL;
private $__colors = array();
private $__font = 'arial.ttf';
private $__sessionName = '';
}
?>使用方法,代码如下:
<?php
//测试文件
include_once ('class.safeCode.php');
session_start();
$safeCode = new safeCode;
$safeCode->setCanvas(200, 50);
$safeCode->setCodeLength(8);
$safeCode->setSafe('2008'); //设置安全码,不设置有默认值,动态生成
$safeCode->setBackground();
$safeCode->setBorderColor();
$safeCode->setFont('arial.ttf'); //设置字体.必须同目录,字体文件
$colors = array(array(128, 64, 192), array(192, 64, 128), array(108, 192, 64));
$safeCode->setFontColor($colors);
$safeCode->setSession();
$safeCode->display('jpeg');本文地址：http://www.phprm.com/tuxiang/fs4506.html
转载随意，但请附上文章地址:-)