check user input

[johnseito]

Hello everyone, 

 

I am wondering how to check a users input, such as is the user input number, character, and the length of character, etc.

 

And for example if I create a field in the table as:

text, for a supposely number input can I check it if the user is inputting a number instead of text? 

phone varchar(30);

 

 

Any code examples or links would be greatly appreciated.

 

thanks

 

[AdRock]

If you are using a form, you could use some regular expressions to check if they are entering the correct data and length

[dotBz]

http://www.php.net/is-numeric

http://www.php.net/is-string

http://www.php.net/strlen

and regular expressions