Question

我使用codeigniter，我想为验证码制作有效数据，如果验证码混合了大写和小写字符，用户应该在输入中插入大写或大写或混合它们。

在下面的代码中我试了一下，但它没有检查大小写的字符，如何修复呢？

我的验证码图片如下： dAwVJ

//$cap = $this->input->post('captcha');
$cap = 'dAwVJ';// if i change this to dawvj return(output) is true, i don't want this

// Then see if a captcha exists:    
$sql   = "SELECT COUNT(*) AS count FROM captcha WHERE word = ? AND ip_address = ? AND captcha_time > ?";
$binds = array(
    $cap,
    $this->input->ip_address(),
    $expiration
);
$query = $this->db->query($sql, $binds);
$row   = $query->row();

if ($row->count == 0) {
    return false;
} else {
    return true;
}

Answer 1

试试这个sql：

$sql   = "SELECT COUNT(*) AS count FROM captcha WHERE binary word = ? AND ip_address = ? AND captcha_time > ?";

Answer 2

你的意思是mysql中的区分大小写的字符串比较？我认为会是这样的：WHERE word like binary ?

由于您使用的是codeigniter，这可能很有用：mysql, case sensitive compare through codeigniter

Answer 3

$sql   = "SELECT COUNT(*) AS count FROM captcha WHERE BINARY word = ? AND ip_address = ? AND captcha_time > ?";

在php中检查带有小写和大写字符的验证码

3 个答案: