Form input validation - Webmaster Forums - Webmaster forum for HTML, PHP, ASP, CSS and more

mrasla · 09-19-2005, 11:58 AM

Hi,
I need to know how to parse a String in PHP in my form.
For example when a use enters his/her name, I want to check that the user only entered alphabetical characters.

thanks

taylor · 09-19-2005, 06:39 PM

Most times numbers are not part of a name. But apostrophes, spaces, dashes, periods and commas might or can be.

PHP variable names must begin with "$" so this eaxample may help:

PHP Code:


		
			
for($i=0;$i<strlen($name);$i++)

{

   if(($char[i]<'a' ||$char[i]>'z')&&($char[i]<'A' ||$char[i]>'Z'))

   {

   return FALSE;

   }

  return TRUE;

}

With PHP you could also use a regular expression engine that would allow the above to be done without the loop.

cheers

mehedym · 06-23-2006, 04:14 AM

HI.

can u explain how does the code works. i am little confused

**etono** · 06-23-2006, 03:57 PM

You can use the ctype_alpha function to achieve the same results.

PHP Code:


		
			
<?php

if( ctype_alpha( $name ) ) {

    echo "$name contains only alpha characters.";

} else {

    echo "$name does not consist of only alpha characters.";

}

?>