Simple implementation method of verification code in thinkPHP

This article mainly introduces the simple implementation method of verification code in thinkPHP, and analyzes the implementation principles, steps and calling techniques of thinkPHP verification code in the form of examples. Friends in need can refer to the following examples

Learn the simple implementation method of verification code in thinkPHP. Share it with everyone for your reference, the details are as follows:

The running effect diagram is as follows:

1.php side generates verification code function

public function verify(){
    // 验证码
    import("@.Util.Image");
    Image::buildImageVerify(4,1,'png',40,20,'verify');
}
/**
* 生成图像验证码
* @static
* @access public
* @param string $length 位数
* @param string $mode 类型
* @param string $type 图像格式
* @param string $width 宽度
* @param string $height 高度
* @return string
*/
static function buildImageVerify($length=4, $mode=1, $type='png', $width=48, $height=22, $verifyName='verify') {
    import('ORG.Util.String');
    $randval = String::randString($length, $mode);
    session($verifyName, md5($randval));
    $width = ($length * 10 + 10) > $width ? $length * 10 + 10 : $width;
    if ($type != 'gif' && function_exists('imagecreatetruecolor')) {
      $im = imagecreatetruecolor($width, $height);
    } else {
      $im = imagecreate($width, $height);
    }
    $r = Array(225, 255, 255, 223);
    $g = Array(225, 236, 237, 255);
    $b = Array(225, 236, 166, 125);
    $key = mt_rand(0, 3);
    $backColor = imagecolorallocate($im, $r[$key], $g[$key], $b[$key]);  //背景色（随机）
    $borderColor = imagecolorallocate($im, 100, 100, 100); //边框色
    imagefilledrectangle($im, 0, 0, $width - 1, $height - 1, $backColor);
    imagerectangle($im, 0, 0, $width - 1, $height - 1, $borderColor);
    $stringColor = imagecolorallocate($im, mt_rand(0, 200), mt_rand(0, 120), mt_rand(0, 120));
    // 干扰
    for ($i = 0; $i < 10; $i++) {
      imagearc($im, mt_rand(-10, $width), mt_rand(-10, $height), mt_rand(30, 300), mt_rand(20, 200), 55, 44, $stringColor);
    }
    for ($i = 0; $i < 25; $i++) {
      imagesetpixel($im, mt_rand(0, $width), mt_rand(0, $height), $stringColor);
    }
    for ($i = 0; $i < $length; $i++) {
      imagestring($im, 5, $i * 10 + 5, mt_rand(1, 8), $randval{$i}, $stringColor);
    }
    Image::output($im, $type);
}

While generating the image, pass it into the session.

2. Page side

<img id="verifyImg" src="{sh::U(&#39;Agent/Login/verify&#39;)}" onClick="changeVerify()" title="点击刷新验证码" /></p>

Call directly from src.

Click to trigger changes.

function changeVerify(){
 verifyURL = "{sh::U('Agent/Login/verify')}";
 $("#verifyImg").attr("src",verifyURL);
 return false;
}

3. Background verification, compare the post field and the verification code in the session to see if they are consistent.

if($_SESSION['verify'] != md5($_POST['verify'])) {
  $this->error('验证码错误！');
}

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