php check for digits

Posted on 2012-04-07
Medium Priority
Last Modified: 2012-04-08
hi ,

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


Question by:MK15
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
LVL 84

Assisted Solution

by:Dave Baldwin
Dave Baldwin earned 1000 total points
ID: 37819818
Use 'ctype_digit' and 'substr'.

$strings = array('pass', '123456783x', '359372910flasd','fail','asd2345343213');
foreach ($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

LVL 84

Expert Comment

by:Dave Baldwin
ID: 37819836
This is a better version:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"

<title>PHP Digits</title>
<h1>PHP Digits</h1>
$strings = array('pass', '123456783x', '359372910flasd','fail','asd2345343213');
foreach ($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";


Open in new window

LVL 18

Accepted Solution

Andrej Pirman earned 1000 total points
ID: 37819842
$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


Author Comment

ID: 37821310
cheers guys they both did the trick

Featured Post

Concerto Cloud for Software Providers & ISVs

Can Concerto Cloud Services help you focus on evolving your application offerings, while delivering the best cloud experience to your customers? From DevOps to revenue models and customer support, the answer is yes!

Learn how Concerto can help you.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Popularity Can Be Measured Sometimes we deal with questions of popularity, and we need a way to collect opinions from our clients.  This article shows a simple teaching example of how we might elect a favorite color by letting our clients vote for …
Many old projects have bad code, but the budget doesn't exist to rewrite the codebase. You can update this code to be safer by introducing contemporary input validation, sanitation, and safer database queries.
The viewer will learn how to create and use a small PHP class to apply a watermark to an image. This video shows the viewer the setup for the PHP watermark as well as important coding language. Continue to Part 2 to learn the core code used in creat…
The viewer will learn how to create a basic form using some HTML5 and PHP for later processing. Set up your basic HTML file. Open your form tag and set the method and action attributes.: (CODE) Set up your first few inputs one for the name and …
Suggested Courses

719 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question