Re: Re: [PHP] What is a label?

On Wed, 2011-07-13 at 23:27 +0100, Tim Streater wrote: > On 13 Jul 2011 at 22:39, Micky Hulse <rgmicky@gmail.com> wrote: > > > They must mean labels as in "general naming convention rules for > > programming"... Like not naming a variable/function "label" with a number > > at > > the front. > > > > Here's a page about variables: > > > > http://www.php.net/manual/en/language.variables.basics.php > > > > Variable names follow the same rules as other labels in PHP. A valid > > variable name starts with a letter or underscore, followed by any > > number of letters, numbers, or underscores. As a regular expression, > > it would be expressed thus: '[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*' > > Except that variables are case-sensitive whereas function names are not. And if there's > going to be a formal or "programmatic" definition, then I think I'd prefer BNF to a > regexp. > > -- > Cheers -- Tim > Isn't that statement a little misleading? > A valid variable name starts with a letter or underscore If I am not mistaken, $_1 is not a valid variable name. Steve.