Collect a more beautiful PHP verification code class_PHP tutorial

Needless to say the purpose of verification code. I also wrote an article about PHP verification code before, but it was not encapsulated into a class. The following is an introduction to a verification code class in PHP.

<?php
    session_start();
    Header("Content-type: image/gif");
	
    class SecurityCode
    {
        private $codes = '';
		
        function __construct()
        {
            $code = '0-1-2-3-4-5-6-7-8-9-A-B-C-D-E-F-G-H-I-J-K-L-M-N-O-P-Q-R-S-T-U-V-W-X-Y-Z';
            $codeArray = explode('-',$code);
            shuffle($codeArray);
            $this->codes = implode('',array_slice($codeArray,0,4));
        }
		
        public function CreateImg()
        {
            $_SESSION['check_pic'] = $this->codes;
            $img = imagecreate(70,25);
            imagecolorallocate($img,222,222,222);
            $testcolor1 = imagecolorallocate($img,255,0,0);
            $testcolor2 = imagecolorallocate($img,51,51,51);
            $testcolor3 = imagecolorallocate($img,0,0,255);
            $testcolor4 = imagecolorallocate($img,255,0,255);
			
            for ($i = 0; $i < 4; $i++)
            {
                imagestring($img,rand(5,6),8 + $i * 15,rand(2,8),$this->codes[$i],rand(1,4));
            }
            imagegif($img);
        }
    }
	
    $code = new SecurityCode();
    $code->CreateImg();
	
	$code = NULL;
?>

After encapsulating it into a class, a constructor is added, which makes it easier to use. You can also continue to improve this verification code class, such as adding a destructor, how to save memory, etc.

http://www.bkjia.com/PHPjc/752568.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/752568.htmlTechArticleNeedless to say the purpose of verification code. I also wrote an article about PHP verification code before, but Not encapsulated into classes. The following is an introduction to a verification code class in PHP. ?php session_s...