Make string usable as a URI (See related posts)

function dirify($s) {
     $s = convert_high_ascii($s);  ## convert high-ASCII chars to 7bit.
     $s = strtolower($s);           ## lower-case.
     $s = strip_tags($s);       ## remove HTML tags.
     $s = preg_replace('!&[^;\s]+;!','',$s);         ## remove HTML entities.
     $s = preg_replace('![^\w\s.]!','',$s);           ## remove non-word/space/period chars.
     $s = preg_replace('!\s+!','-',$s);               ## change space chars to dashes.
     return $s;    
}

function convert_high_ascii($s) {
 	$HighASCII = array(
 		"!\xc0!" => 'A',    # A`
 		"!\xe0!" => 'a',    # a`
 		"!\xc1!" => 'A',    # A'
 		"!\xe1!" => 'a',    # a'
 		"!\xc2!" => 'A',    # A^
 		"!\xe2!" => 'a',    # a^
 		"!\xc4!" => 'Ae',   # A:
 		"!\xe4!" => 'ae',   # a:
 		"!\xc3!" => 'A',    # A~
 		"!\xe3!" => 'a',    # a~
 		"!\xc8!" => 'E',    # E`
 		"!\xe8!" => 'e',    # e`
 		"!\xc9!" => 'E',    # E'
 		"!\xe9!" => 'e',    # e'
 		"!\xca!" => 'E',    # E^
 		"!\xea!" => 'e',    # e^
 		"!\xcb!" => 'Ee',   # E:
 		"!\xeb!" => 'ee',   # e:
 		"!\xcc!" => 'I',    # I`
 		"!\xec!" => 'i',    # i`
 		"!\xcd!" => 'I',    # I'
 		"!\xed!" => 'i',    # i'
 		"!\xce!" => 'I',    # I^
 		"!\xee!" => 'i',    # i^
 		"!\xcf!" => 'Ie',   # I:
 		"!\xef!" => 'ie',   # i:
 		"!\xd2!" => 'O',    # O`
 		"!\xf2!" => 'o',    # o`
 		"!\xd3!" => 'O',    # O'
 		"!\xf3!" => 'o',    # o'
 		"!\xd4!" => 'O',    # O^
 		"!\xf4!" => 'o',    # o^
 		"!\xd6!" => 'Oe',   # O:
 		"!\xf6!" => 'oe',   # o:
 		"!\xd5!" => 'O',    # O~
 		"!\xf5!" => 'o',    # o~
 		"!\xd8!" => 'Oe',   # O/
 		"!\xf8!" => 'oe',   # o/
 		"!\xd9!" => 'U',    # U`
 		"!\xf9!" => 'u',    # u`
 		"!\xda!" => 'U',    # U'
 		"!\xfa!" => 'u',    # u'
 		"!\xdb!" => 'U',    # U^
 		"!\xfb!" => 'u',    # u^
 		"!\xdc!" => 'Ue',   # U:
 		"!\xfc!" => 'ue',   # u:
 		"!\xc7!" => 'C',    # ,C
 		"!\xe7!" => 'c',    # ,c
 		"!\xd1!" => 'N',    # N~
 		"!\xf1!" => 'n',    # n~
 		"!\xdf!" => 'ss'
 	);
 	$find = array_keys($HighASCII);
 	$replace = array_values($HighASCII);
 	$s = preg_replace($find,$replace,$s);
     return $s;
}