Validating phone numbers in php

Useful to state these odd cases, for when you see code that checks for an empty string and is_numeric, you can tell it's a waste of a comparison. is_numeric will also return true if the number begins with a decimal point and/or a space, provided a number follows (rather than a letter or punctuation). If we really want just an integer, this function is too broad."Source: regarding the global vs.

So, it doesn't necessarily have to start with a digit. american numeral notations, it should be noted that at least in japanese, numbers aren't grouped with an extra symbol every three digits, but rather every four digits (for example 1,0000 instead of 10.000).

The easiest and safest way to check whether an email address is well-formed is to use PHP's filter_var() function.

When relying on your end-user to supply information in the proper format, you’re S. Most of the applications I work with have a Web-based front-end where users submit data.

I believe that most pass off validation out of laziness, but, as you can see, validating a phone number only adds a few extra lines of code to your application.

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I feel that PCRE is very useful for many tasks, and you’ll see it turn up often when I talk about data validation. Follow me as I take a look at validating user-entered data in this first installment of what I hope to be a continuing series. It’s best to use some proper PHP tools to validate your data and make sure it’s in a format your application can read before passing it along to other places.Validating information is an often overlooked, but essential, part of Web development.It is crucial to the integrity of data and to the security of an application to validate any input.

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