php check for digits

hi ,

I need to be able to check the first 9 digits of a string are numbers, how would i do this?

pass
123456783x
359372910flasd
fail
3k33j52l4
asd3asd323
asd2345343213

thanks
MK15Asked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Dave BaldwinFixer of ProblemsCommented:
Use 'ctype_digit' and 'substr'.

<?php
$strings = array('pass', '123456783x', '359372910flasd','fail','asd2345343213');
foreach ($strings as $testcase) {
    if (ctype_digit(substr($testcase, 0, 9))) {
        echo "The string $testcase consists of all digits.\n";
    } else {
        echo "The string $testcase does not consist of all digits.\n";
    }
}
?>

Open in new window

Dave BaldwinFixer of ProblemsCommented:
This is a better version:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
 "http://www.w3.org/TR/html4/loose.dtd">

<html>
<head>
<title>PHP Digits</title>
</head>
<body>
<h1>PHP Digits</h1>
<?php
$strings = array('pass', '123456783x', '359372910flasd','fail','asd2345343213');
foreach ($strings as $testcase) {
    if (ctype_digit(substr($testcase, 0, 9))) {
        echo "Pass - The string '$testcase' does start with 9 digits.<br>\r\n";
    } else {
        echo "Fail - The string '$testcase' does Not start with 9  digits.<br>\r\n";
    }
}
?>

</body>
</html>

Open in new window

Andrej PirmanCommented:
$string = "4534563436nmrer";
$first_part = substr($string, 0, 9);
if (intval($first_part)==$first_part) { 
   echo "First 9 chars are numerical"; 
} else {
   echo "Not numerical";
}

Open in new window

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
MK15Author Commented:
cheers guys they both did the trick
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
PHP

From novice to tech pro — start learning today.