Need Help With Only Inserting Numbers In Textfield

[iNko]

Yesterday i got help with checking if textfield is empty, now i also need to make it so only numbers can be inserted in a specific textfield.

Heres the code that checks if field is empty:

if (empty($_POST['numbers'])) {
$error [] = 1;
} else {
$numbers= $_POST['numbers'];
}

 

Can i add another IF after the ELSE in this code that checks if its numbers?

[haku]

I'm guessing you want something like this:

 

if (empty($_POST['numbers']))
{
$error [] = 1;
}
elseif(!is_numeric($_POST['numbers'])
{
 $error[] = 2;
}
else
{
 $numbers= $_POST['numbers'];
}

[50r]

most of the time i use this ctype_digit($_POST['numbers'])

[iNko]

I'm guessing you want something like this:

 

if (empty($_POST['numbers']))
{
$error [] = 1;
}
elseif(!is_numeric($_POST['numbers']))
{
$error[] = 2;
}
else
{
$numbers= $_POST['numbers'];
}

 

Thank you, this works very well.

Also as a side question, can i make this code without the 'elseif'? Something like this:

if ((empty($_POST['numbers'])) OR (!is_numeric($_POST['numbers']))
{
$error [] = 1;
}
else
{
$numbers= $_POST['numbers'];

 

also 'is_numeric' is for numbers, is there a name for 'is letters'?

Edited November 3, 2012 by iNko

[Pikachu2000]

is_numeric() will allow values such as 0x57BEF4A and 1.99456e313. ctype_digit and ctype_alpha would be more appropriate for form data.