第一步：下載驗證碼類 具體如下：
<?php
/**
* 驗證碼類
* @package
* @author 57sy.com
*/
class Code{
//資源
private $img;
//畫布寬度
public $width = 150;
//畫布高度
public $height = 45;
//背景顏色
public $bgColor = "#ffffff";
//驗證碼
public $code;
//驗證碼的隨機種子
public $codeStr = "123456789abcdefghijklmnpqrstuvwsyz";
//驗證碼長度
public $codeLen = 4;
//驗證碼字體
public $font = "";//具體環境具體需要更改路徑
//驗證碼字體大小
public $fontSize = 22;
//驗證碼字體顏色
public $fontColor = "";
/**
* 構造函數
*/
public function __construct($arr = array()) {
$width = '';
$height = '';
$codeLen = '';
$fontSize = '';
$bgColor = '';
$fontColor = '';
if(!empty($arr)){
extract($arr);
}
//$this->font = $arr['font'];
$this->font = BASEPATH . "fonts/font.ttf";
//echo BASEPATH . "fonts/font.ttf";die;
if (!is_file($this->font)) {
error("驗證碼字體文件不存在");
}
$this->width = empty($width) ? $this->width : $width;
$this->height = empty($height) ? $this->height : $height;
$this->bgColor = empty($bgColor) ? $this->bgColor : $bgColor;
$this->codeLen = empty($codeLen) ? $this->codeLen : $codeLen;
$this->fontSize = empty($fontSize) ? $this->fontSize : $fontSize;
$this->fontColor = empty($fontColor) ? $this->fontColor : $fontColor;
$this->create();//生成驗證碼
}
/**
* 生成驗證碼
*/
private function createCode() {
$code = '';
for ($i = 0; $i < $this->codeLen; $i++) {
$code .= $this->codeStr [mt_rand(0, strlen($this->codeStr) - 1)];
}
$this->code = strtoupper($code);
if(!isset($_SESSION)){
session_start();
}
$this->CI = &get_instance();
$this->CI->session->set_userdata('code', $this->code);
//$_SESSION ['code'] = $this->code;
}
/**
* 返回驗證碼
*/
public function getCode() {
return $this->code;
}
/**
* 建畫布
*/
public function create() {
if (!$this->checkGD())
return false;
$w = $this->width;
$h = $this->height;
$bgColor = $this->bgColor;
$img = imagecreatetruecolor($w, $h);
$bgColor = imagecolorallocate($img, hexdec(substr($bgColor, 1, 2)), hexdec(substr($bgColor, 3, 2)), hexdec(substr($bgColor, 5, 2)));
imagefill($img, 0, 0, $bgColor);
$this->img = $img;
$this->createLine();
$this->createFont();
$this->createPix();
$this->createRec();
}
/**
* 畫線
*/
private function createLine(){
$w = $this->width;
$h = $this->height;
$line_height = $h/10;
$line_color = "#D0D0D0";
$color = imagecolorallocate($this->img, hexdec(substr($line_color, 1, 2)), hexdec(substr($line_color, 3, 2)), hexdec(substr($line_color, 5, 2)));
for($i=0;$i<10;$i++){
$step =$line_height*$i+2;
imageline($this->img, 0, $step, $w,$step, $color);
}
$line_width = $w/10;
for($i=0;$i<10;$i++){
$step =$line_width*$i+2;
imageline($this->img, $step-2, 0, $step+2,$h, $color);
}
}
/**
* 畫矩形邊框
*/
private function createRec() {
imagerectangle($this->img, 0, 0, $this->width - 1, $this->height - 1, $this->fontColor);
}
/**
* 寫入驗證碼文字
*/
private function createFont() {
$this->createCode();
$color = $this->fontColor;
if (!empty($color)) {
$fontColor = imagecolorallocate($this->img, hexdec(substr($color, 1, 2)), hexdec(substr($color, 3, 2)), hexdec(substr($color, 5, 2)));
}
$x = ($this->width - 10) / $this->codeLen;
for ($i = 0; $i < $this->codeLen; $i++) {
if (empty($color)) {
$fontColor = imagecolorallocate($this->img, mt_rand(50, 155), mt_rand(50, 155), mt_rand(50, 155));
}
imagettftext($this->img, $this->fontSize, mt_rand(- 30, 30), $x * $i + mt_rand(6, 10), mt_rand($this->height / 1.3, $this->height - 5), $fontColor, $this->font, $this->code [$i]);
}
$this->fontColor = $fontColor;
}
/**
* 畫線
*/
private function createPix() {
$pix_color = $this->fontColor;
for ($i = 0; $i < 50; $i++) {
imagesetpixel($this->img, mt_rand(0, $this->width), mt_rand(0, $this->height), $pix_color);
}
for ($i = 0; $i < 2; $i++) {
imageline($this->img, mt_rand(0, $this->width), mt_rand(0, $this->height), mt_rand(0, $this->width), mt_rand(0, $this->height), $pix_color);
}
//畫圓弧
for ($i = 0; $i < 1; $i++) {
// 設置畫線寬度
// imagesetthickness($this->img, mt_rand(1, 3));
imagearc($this->img, mt_rand(0, $this->width), mt_rand(0, $this->height), mt_rand(0, $this->width), mt_rand(0, $this->height)
, mt_rand(0, 160), mt_rand(0, 200), $pix_color);
}
imagesetthickness($this->img, 1);
}
/**
* 顯示驗證碼
*/
public function show() {
header("Content-type:image/png");
imagepng($this->img);
imagedestroy($this->img);
exit;
}
/**
* 驗證GD庫是不否打開imagepng函數是否可用
*/
private function checkGD() {
return extension_loaded('gd') && function_exists("imagepng");
}
}
第二步：將下載驗證碼類，之後再到application目錄下的libraries目錄文件夾下新建一個爲：Code.php文件
第三步：在控制器中寫如下代碼：
//生成驗證碼
public function code(){
$config = array(
'width' => 115,
'height' => 25,
'fontSize' => 16
);
$this->load->library('code',$config);
$this->code->show();
}
第四步：在html頁面的代碼如下：
<div class="form-group">
<label for="j_captcha" class="t">驗證碼：</label>
<input id="j_captcha" name="j_captcha" type="text" class="form-control x164 in">
<img id="captcha_img" alt="點擊更換" title="點擊更換" src="{$base_url}code" class="m" onclick="javascript:this.src='{$base_url}code?'+Math.random()">
</div>