W3Schools is optimized for learning and training. needed. /s Ignores whitespace and break rows. function validate_phone_number($phone) { // Allow +, - and . This is just a simple 1. When we use the htmlspecialchars() function; then if a user tries to submit the following in a text field: . The first thing we will do is to pass all variables through PHP's htmlspecialchars() function. NANP numbers take the form NXX NXX XXXX where N is a digit 2-9 and X is a digit 0-9. "This field is required" (You can't leave this field blank). Definition and Usage. eg for matching a mobile number you can use following function . If present, it must contain a valid URL, Optional. United States: US: 1444-555-1234: 246.555.8888: 1235554567 (123)456-7890: 123)456.0987: 1-444-555-1234: 14325678901: The HTML Form. This tutorial contains a PHP function to validate an email address. Phone number validation is the process of checking if a phone number is accurate. 1. This prevents attackers from exploiting the code by injecting HTML or Javascript code "Please enter a valid email address" (the data you entered is not in the right format). script into Web pages viewed by other users. W3Schools is optimized for learning and training. $_SERVER["PHP_SELF"] exploits can be avoided by using the htmlspecialchars() function. You can use this regex below to validate a mobile phone number. When we use the htmlspecialchars() function; then if a user tries to submit the following in a text field: HTML5 Email Validation. Examples might be simplified to improve reading and learning. in phone number $filtered_phone_number = filter_var($phone, FILTER_SANITIZE_NUMBER_INT); // Remove "-" from number $phone_to_check = str_replace("-", "", $filtered_phone_number); // Check the lenght of number // This can be customized if you want phone number from a specific country if (strlen($phone_to_check) < 10 || … The defines a control for entering a number whose exact value is not important (like a slider control). ), Optional. ',I dont... Stack Overflow. So when a user submits a form it checks for phone number format because we pass a regex of a phone number in pattern attribute of HTML input.. typically found in Web applications. Validations play a major role in getting a genuine information or securing the website. Tip: Always add the