Handy, indeed, for pesky spambots and tricksters in some input forms: Example: FILTER_SANITIZE_NUMBER_FLOAT.php jQuery form validation Email, Mobile Number - Learn jQuery form validation Email, Mobile Number with complete source code, explanation and demo. Preg_match Function. Syntax. In this article I explain card number validation in PHP using JavaScript and discuss how to validate a credit card and master cart number with a JavaScript function. & ans. Email ID Validation – FILTER_SANITIZE_EMAIL and FILTER_VALIDATE_EMAIL: This filter first removes all the illegal characters from the email and then checks whether the format is valid or not. Please give us a Like, if you find it helpful. The PHP showcase will show you how the output of the example code will look like when you execute it on your server. function validating($phone){ $valid_number = filter_var($phone, FILTER_SANITIZE_NUMBER_INT); $valid_number = str_replace("-", "", $valid_number); if (strlen($valid_number) < 10 || strlen($valid_number) > 14) { echo "Invalid Number
"; } else { echo "Valid Number
"; } } validating("+1-202-555-0170000"); Of course, a digit only value might not be within the integer range, for example is_integer(12345678901234567890) would return false but does only contain numbers. Generally, you would expect the result of the multiplication of two variables of type int to be of type int. This method can be used to validate any integer value such as a primary integer key (userId, groupId, etc.) At first-entry, we will validate that it is indeed an integer. Just remember when using regular expressions with PHP to use the preg* functions and not the ereg* functions because the latter are deprecated in PHP 6. FILTER_SANITIZE_NUMBER_FLOAT: This filter is similar to the FILTER_VALIDATE_INT but instead of simply checking if it is an Integer or not, it actually removes everything non-integer from the value! 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