使用PHP停止使用空输入值提交

Question

我正在寻找一个简单的PHP解决方案来阻止表单中的空输入值提交空输入字段.表格的代码如下.如果可能的话,我想使用简单的PHP(非Javascript)解决方案.

Form.php 码:

<form name="form" method="post" action="add.php">
<input type="text" name="url" id="url">
<button type="submit" id="submit">submit</button>
</form>

add.php 码:

$url=$_POST['url'];
$sql= "insert into my_table set url='$url'";
mysql_query($sql) or die("query failed: $sql".mysql_error());
$msg= 'URL Added Thank You';
session_register('msg');
header("Location: form.php ");
exit;

如果有任何PHP解决方案,以防止在表单提交之前或提交之后提交空输入,那么它可以将我发回给form.php.

谢谢.

Answer 1

就个人而言,我几乎总是分两步完成这些事情.先消毒,然后验证.

// Step 1: Sanitize fields
$url = mysql_real_escape_string($_POST['url']);

// Step 2: Validate fields
if(empty($url))
{
    $msg = "Text can't be empty";
    session_register('msg');
    header("Location: form.php ")
}

// Step 3: Whatever
$sql= "insert into my_table set url='$url'";
mysql_query($sql) or die("query failed: $sql".mysql_error());
$msg= 'URL Added Thank You';
session_register('msg');
header("Location: form.php ");
exit;