《PHP實戰：CodeIgniter框架驗證碼類庫文件與用法示例》要點：
本文介紹了PHP實戰：CodeIgniter框架驗證碼類庫文件與用法示例，希望對您有用。如果有疑問，可以聯系我們。
PHP編程本文實例講述了CodeIgniter框架驗證碼類庫文件與用法.分享給大家供大家參考,具體如下：
PHP編程折騰了我四五個小時,終于,ci的驗證碼類庫成功的整出來了.
PHP編程下面請看源碼：
PHP編程在application/libraries建立Authcode.php文件,代碼如下：
PHP編程
<?php
class Authcode
{
var $CI;
var $fontPath;//字體路徑
var $image;
var $charLen = 4; //生成幾位驗證碼
var $arrChr = array();//驗證碼字符
var $width = 83; //圖片寬
var $height = 24; //圖片高
var $bgcolor = "#ffffff"; //背景色
var $showNoisePix = true; //生成雜點
var $noiseNumPix = 80; //生成雜點數量
var $showNoiseLine = true; //生成雜線
var $noiseNumLine = 2; //生成雜線數量
var $showBorder = true; //邊框,當雜點、線一起作用的時候,邊框容易受干擾
var $borderColor = "#000000";
function Authcode()
{
$this->CI = & get_instance();
$this->fontPath = realpath(dirname(__FILE__) . '/fonts/'); //字體文件
//$this->arrChr = array_merge(range(1, 9) , range('A', 'Z'));//數字字母驗證碼
//$this->arrChr = range('A', 'Z');//純字母驗證碼
$this->arrChr = range(0, 9);//純數字驗證碼
}
/**
* 顯示驗證碼
*
*/
function show()
{
$this->image = imageCreate($this->width, $this->height);
$this->back = $this->getColor($this->bgcolor);
imageFilledRectangle($this->image, 0, 0, $this->width, $this->height, $this->back);
$size = $this->width / $this->charLen - 4;
if ($size > $this->height) {
$size = $this->height;
}
$left = ($this->width - $this->charLen * ($size + $size / 10)) / $size + 5;
$code = '';
for($i = 0; $i < $this->charLen; $i ++) {
$randKey = rand(0, count($this->arrChr) - 1);
$randText = $this->arrChr[$randKey];
$code .= $randText;
$textColor = imageColorAllocate($this->image, rand(0, 100), rand(0, 100), rand(0, 100));
$font = $this->fontPath . '/' . rand(1, 5) . ".ttf";
$randsize = rand($size - $size / 10, $size + $size / 10);
$location = $left + ($i * $size + $size / 10);
@imagettftext($this->image, $randsize, rand(- 18, 18), $location, rand($size - $size / 10, $size + $size / 10) + 2, $textColor, $font, $randText);
}
if ($this->showNoisePix == true) {
$this->setNoisePix();
}
if ($this->showNoiseLine == true) {
$this->setNoiseLine();
}
if ($this->showBorder == true) {
$this->borderColor = $this->getColor($this->borderColor);
imageRectangle($this->image, 0, 0, $this->width - 1, $this->height - 1, $this->borderColor);
}
$this->CI->session->set_userdata('auth_code', $code);
ob_clean();
header("Content-type: image/jpeg");
imagejpeg($this->image);
imagedestroy($this->image);
}
/**
* 顯示驗證碼的JS調用
*
*/
function showScript()
{
//顯示驗證碼
echo "var img_src = '/imgauthcode/show/?';\n";
echo "document.writeln('<img id=\"img_authcode\" src=\"' + img_src + Math.random() + '\" style=\"cursor:hand;\" onclick=\"this.src=img_src + Math.random();\" alt=\"點擊更換圖片\">');";
}
/**
* 檢查驗證碼是否正確
*
* @param string $auth_code
* @return bool
*/
function check($auth_code = null)
{
return ($this->CI->session->userdata('auth_code') && $auth_code) ? ($this->CI->session->userdata('auth_code') === $auth_code) : false;
}
function getColor($color)
{
$color = eregi_replace("^#", "", $color);
$r = $color[0] . $color[1];
$r = hexdec($r);
$b = $color[2] . $color[3];
$b = hexdec($b);
$g = $color[4] . $color[5];
$g = hexdec($g);
$color = imagecolorallocate($this->image, $r, $b, $g);
return $color;
}
function setNoisePix()
{
for($i = 0; $i < $this->noiseNumPix; $i ++) {
$randColor = imageColorAllocate($this->image, rand(0, 255), rand(0, 255), rand(0, 255));
imageSetPixel($this->image, rand(0, $this->width), rand(0, $this->height), $randColor);
}
}
function setNoiseLine()
{
for($i = 0; $i < $this->noiseNumLine; $i ++) {
$randColor = imageColorAllocate($this->image, rand(0, 255), rand(0, 255), rand(0, 255));
imageline($this->image, rand(1, $this->width), rand(1, $this->height), rand(1, $this->width), rand(1, $this->height), $randColor);
}
}
}
PHP編程Authcode.php代碼結束
PHP編程在Controller中,有個admin類,其中有兩個方法：
PHP編程
Class Admin extends CI_Controller{
function __construct()
{
parent::__construct();
$this->load->library('Authcode');
}
function captcha(){
if($_POST){
if ($this->authcode->check($this->input->post('gd_pic'))) {
echo "right";
} else {
echo '驗證碼不正確,請重新輸入';
}
}else{
$this->load->view('demo');
}
}
function show_captcha(){ //此方法用于顯示驗證碼圖片,歸一個view中的img的src調用
$this->authcode->show();
}
}
PHP編程下面是在視圖view中創建一個demo.php了,代碼如下：
PHP編程
<?php echo form_open('c=admin&m=captcha');?>
<input type="text" name="gd_pic" />
<img src="<?php echo base_url('?c=admin&m=show_captcha');?>" ><br>
<input type="submit" name="submit" value="驗證" />
<?php echo form_close();?>
PHP編程OK. 一切結束,終于正常運行了.
PHP編程更多關于CodeIgniter相關內容感興趣的讀者可查看本站專題：《codeigniter入門教程》、《CI(CodeIgniter)框架進階教程》、《php優秀開發框架總結》、《ThinkPHP入門教程》、《ThinkPHP常用方法總結》、《Zend FrameWork框架入門教程》、《php面向對象程序設計入門教程》、《php+mysql數據庫操作入門教程》及《php常見數據庫操作技巧匯總》
PHP編程希望本文所述對大家基于CodeIgniter框架的PHP程序設計有所幫助.
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