麻烦我的PHP验证脚本

Question

So I have created a PHP validation script. On test I filled and submitted the forms but so far $error returns undefined index and no data is set into the database. Can anyone take a look and give a second opinion on why its not functioning as intended? To my eye it all looks OK.

Otherwise my script runs OK (Insert into DB) it's just something about my validation script breaks it.

 <?php  

    if (isset($_POST['Submit'])) {  

        if ($_POST['name'] != "") {  
            $_POST['name'] = filter_var($_POST['name'], FILTER_SANITIZE_STRING);  
            if ($_POST['name'] == "") {  
                $errors .= 'Please enter a valid name.<br/><br/>';  
            }  
        } else {  
            $errors .= 'Please enter a name.<br/>';  
        }  

           if (isset($_POST['Submit'])) {  

        if ($_POST['address'] != "") {  
            $_POST['address'] = filter_var($_POST['address'], FILTER_SANITIZE_STRING);  
            if ($_POST['address'] == "") {  
                $errors .= 'Please enter a valid address<br/><br/>';  
            }  
        } else {  
            $errors .= 'Please enter a address.<br/>';  
        }  

           if (isset($_POST['postcode'])) {  

        if ($_POST['postcode'] != "") {  
            $_POST['postcode'] = filter_var($_POST['postcode'], FILTER_SANITIZE_STRING);  
            if ($_POST['postcode'] == "") {  
                $errors .= 'Please enter a valid name.<br/><br/>';  
            }  
        } else {  
            $errors .= 'Please enter a name.<br/>';  
        }  

        if (!$errors) {  



$name = $_POST['name'];
$address = $_POST['address'];
$postcode = $_POST['postcode'];
$photo = $_POST['photo'];
$db1 = new dbmember();
$db1->openDB();
$numofrows = $db1->insert_member('', $name, $address, $postcode, $photo);
echo "Success. Number of rows affected:
<strong>{$numofrows}<strong>";



$sql="SELECT * from member";
$result=$db1->getResult($sql);
echo "<table class='table table-hover'>";
echo "<tr><th>Member ID</th><th>Name</th><th>Address</th><th>Postcode</th><th>Photo</th></tr>";

  while($row = mysqli_fetch_assoc($result))
{
 echo "<tr>";
 echo "<td>{$row['mid']}</td><td>{$row['name']}</td>";
 echo "<td>{$row['address']}";
echo "<td>{$row['postcode']}";
 echo"<td><img height='80' width='120' src='{$row['photo'] }' /></td>";  
 echo "</tr>";
 }
 echo "</table>";


$db1->closeDB();
}


        }
        }
        }
            echo "Records updated!<br/><br/>";  
        } else {  
            echo '<div style="color: red">' . $errors . '<br/></div>';  
        }  

?>  

<form action="<?php echo $_SERVER['PHP_SELF'] ?>" method="post" name="myform" class = "well" id="myform" onsubmit="return validateForm(  );">

Please fill in the fields to add a new member
<p></p>
<input type="text" class="span3" placeholder="Enter member name"name="name" id="name" /><br />
<input type="text" class="span3"placeholder="Enter an address"name="address" id="address" /><br />
<input type="text" class="span3"placeholder="Enter a postcode"name="postcode" id="postcode" /><br />
<input type="text"class="span3" placeholder="Enter a picture (optional)"name="photo" /><br />
<p>
<button class="btn btn-primary" type="submit" value="Save" >Submit  </button>
</p>

</form>

Answer 1

Your button doesn't have a name="Submit" attribute. Your php code can't find the $_POST['Submit'] because it doesn't exist.

Consequently, the if (isset($_POST['Submit'])) { condition will return false meaning the validation is never performed and the $error variable never set to a value.