form validiation

[desithugg]

umm i want to submit a form but i wanna check if it only contains numbers.I only want numbers enterd in that field.Cna any1 help me with this dont know where to start.

[leeming]

[code]
ereg("[0-9]", $data);
[/code]

will return true if numbers are found, but i think its...

[code]ereg("^[0-9]", $data)[/code]

for only numbers

*sorry if im not 100% on this, but i always got confused, and have a function to do this instead lol*

[wildteen88]

Use is numeric:
[code]<?php

if(isset($_POST['submit']))
{
    if(is_numeric($_POST['numb']))
    {
        echo "Is numeric!";
    }
    else
    {
        echo "Is not numeric!";
    }
}

?>
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">
  <input type="text" name="numb" value="<?php echo @$_POST['numb']; ?>" /><br />
  <input type="submit" name="submit" value="Check number" />
</form>[/code]
Or you can use ereg

[PHPSpirit]

Use the preg_match();

Read this:
http://www.php.net/preg_match

[desithugg]

umm would this work i think it shoudl
[code]<?
$price = $_POST['price'];
if ($price == "")
{
echo"Sorry you didn't fill in the price field.";
exit();
}
if(is_numeric($price]))
{
$query = "INSERT INTO sold (price) VALUES ('$price')"; 
$result = mysql_query($query);
}
  else
    {
        echo "Sorry you may only enter Numbers in the price field.Please go back and fix you're mistakes.";
}
?>[/code]

[wildteen88]

Rather than do this:
[code]<?
$price = $_POST['price'];
if ($price == "")
{
echo"Sorry you didn't fill in the price field.";
exit();
}
if(is_numeric($price]))
{
$query = "INSERT INTO sold (price) VALUES ('$price')"; 
$result = mysql_query($query);
}
  else
    {
        echo "Sorry you may only enter Numbers in the price field.Please go back and fix you're mistakes.";
}
?>[/code]
I'd do this:
[code]<?php

if(isset($_POST['price']) && !empty($_POST['price']) && is_numeric($_POST['price']))
{
    $price = addslashes($_POST['price']);

    $query = "INSERT INTO sold (price) VALUES ('$price')";
    $result = mysql_query($query);
}
else
{
        echo "PLease verify you have filled in the price field correctly";
}
?>[/code]

[ryanlwh]

i'd check for magic quotes before adding slashes
[code]$price = !get_magic_quotes_gpc() ? addslashes($_POST['price']) : $_POST['price'];[/code]