PHP generates graphic verification code (mixed upper and lower case letters and numbers)

From , 3 Years ago, written in PHP, viewed 100 times.

<?php
        header("content-type:image/png");
        $num = $_GET['num'];
        $imagewidth=60;
        $imageheight=18;
        srand(microtime() * 100000);
 
        $numimage = imagecreate($imagewidth,$imageheight);
        imagecolorallocate($numimage,183,180,83);
        for($i=0;$i<strlen($num);$i++){
                $font = mt_rand(3,5);
                $x = mt_rand(1,8)+$imagewidth*$i/4;
                $y = mt_rand(1,$imageheight/3);
                $color=imagecolorallocate($numimage,mt_rand(0,50),mt_rand(0,150),mt_rand(0,255));
                imagestring($numimage,$font,$x,$y,$num[$i],$color);
        }
        imagepng($numimage);
        imagedestroy($numimage);
?>
 
 
 
调用方法：
<?php
        session_start();
        include_once 'conn/conn.php';
        $pattern = '1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLOMNOPQRSTUVWXYZ';
        $num = null;
        for($i = 0; $i < 4; $i++) {
        $num .= $pattern{mt_rand(0, 61)};
        }       
?>
 
<div> 验证码：
  <input id="lgchk" type="text" />
  <img src="valcode.php?num=<?php echo $num; ?>" width="55" height="18" /> </div>
 

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PHP generates graphic verification code (mixed upper and lower case letters and numbers)

Reply to "PHP generates graphic verification code (mixed upper and lower case letters and numbers)"