php - preg_replace - leaving in unwanted characters -

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I have a string: 

  $ string = "Hello World!";

I want to convert it into a URL-friendly tag, and I have developed a function to do this: 

  function strip junk ($ string ) {$ String = str_replace ("", "-", $ string); $ String = preg_replace ("/ [^ a-zA-Z] \ s /", "", $ string); $ String = Stroglager ($ string); Return $ string; }

However, when I run my $ string from above, I get the following: 

  $ string = "Hello world!";

It seems that my preg_replace is slipped through the characters, even if I understand what I think, they should not be.

It should be read like this: 

  $ string = "hello-world";

What's going on here? (It should be a smooth smooth lemon scsi!)

Edit 1 : I did not know that regular expression was the initial stuff, but whatever else, \ Removing in the string does not result in desired results.

The desired result is:

  1. All locations are converted to dashes.
  2. All remaining characters that are not AZ or 0-9
  3. The string is then converted to a lower case.

Editing 2 + : My code has been cleared slightly.

The following work is just me: 

  function string junk ( $ String) {$ string = str_replace ("", "-", trim ($ string)); $ String = preg_replace ("/ [^ a-zA-Z0-9 -] /", "", $ string); $ String = Stroglager ($ string); Return $ string; }

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