phone number

[Anon]

I have a webpage with a form where users have to fill in a phone number. When i send the form to my PHP-page i want to check if the number actually are numbers and not letters or other character. if there is any character i want to raise an error message.

How can i do this in the best way?

/Johan

[fandelem]

http://www.php.net/manual/en/function.is-numeric.php

will get you started 🙂

[trippyd]

This is functional but not all that user friendly... before checking if it is a number, I would remove any whitespace, parens (), dashes -, and periods .

In the last page I did this, I did it on the form with javascript before it was submitted... something like...

<SCRIPT LANGUAGE="JavaScript" TYPE="text/javascript">
<!--
function checkPhone(f) {
var tmp = f.phone.value;
tmp = tmp.replace(/[().\s-]/gi,'');
if (!isFinite(tmp) ||
tmp.length != 10)
{
alert("Please enter a valid 10 digit phone number");
return false;
}
f.phone.value = tmp;
}
//-->
</SCRIPT>

<form onSubmit="return checkPhone(this);">
Phone Number: <input type="text" name="phone" size="20" maxlength="20"><br>
<input type="submit">
</form>

hope this helps.

[Anon]

And if you have multiple phone #'s within the same form that you'd like this js to work for?