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PHP generates graphic verification code (mixed uppercase and lowercase letters and numbers)

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Release： 2016-07-25 08:45:46

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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 $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：
session_start();
include_once 'conn/conn.php';
$pattern = '1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLOMNOPQRSTUVWXYZ';
$num = null;
for($i = 0; $i < 4; $i++) {
$num .= $pattern{mt_rand(0, 61)};
}
?>
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验证码, 写字母, PHP

Related labels：

PHP生成图形验证码（大小写字母与数字混合）

source：php.cn

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