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Dirify in PHP

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Movable Type has a dirify option that converts strings to something that can be used in a Web filename. It strips certain characters, converts spaces to underscores, and makes some other changes. One of my client sites has a number of pages that use PHP to access the MT database directly and displays the entries dynamically (something that the upcoming MT 3.1 does natively).

But since the site uses static pages with dirified titles as the filenames, I needed to convert the MT data from the database to MT’s archive URL format using a dirify function, so I ported the dirify mechanism to PHP.

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 chars.
     $s = preg_replace('!\s+!','_',$s);               ## change space chars to underscores.
     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;

To use this function, simply pass in the string you want dirified, like so:

<?php echo dirify("Here’s the title of an entry!"); ?>

Dennis Pallett
July 28, 2004 1:52 PM

Looks pretty good. Mind if I post it at my php website, PHPit, with full credit to you of course?

July 29, 2004 12:46 AM

Very nice! Looks a bit more complex and complete than the original one I have bookmarked from the early days. :),and,function Thanks for posting it!

Gabriel Radic
August 12, 2004 8:58 AM

Hello Adam, nice work with PHP dirify, thanks a lot. Would you be interested in improving the high-ascii filter with a few bug fixes and more supported characters? I did this already for MT. Too bad the developers didn't listen to my whining and didn't implement the changes. You can find the improved high-ascii filter here Thanks.

Adam Kalsey
August 12, 2004 9:57 AM

Not really, unless it's also implemented in MT. The idea here isn't to be perfect, but to be an exact work-alike o fhte MT function so you can use PHP to construct URLs that point to files created by the MT build process. That way I can have individual archive pages be staticly created by MT but the indexes are dynamic. The upcoming MT3.1 does nearly the exact same thing (in fact the code is so similar it's scary), but there are people who won't be running the dynamic features of 3.1 who would still want to use this code.

Rob Bolton
August 18, 2004 8:15 AM

Very nice, this should work well.

August 18, 2004 11:23 AM

Here's mine in javascript: function makeShortcut( str ){ str = str.toLowerCase(); var rExps=[ /[\xC0-\xC2]/g, /[\xE0-\xE2]/g, /[\xC8-\xCA]/g, /[\xE8-\xEB]/g, /[\xCC-\xCE]/g, /[\xEC-\xEE]/g, /[\xD2-\xD4]/g, /[\xF2-\xF4]/g, /[\xD9-\xDB]/g, /[\xF9-\xFB]/g ]; var repChar=['A','a','E','e','I','i','O','o','U','u']; for(var i=0; i<rExps.length; i++){ str = str.replace(rExps[i],repChar[i]); } str = str.replace( /\W+/g, '-' ); str = str.replace( /[_-]+/g, '-' ); str = str.replace( /^-/, ''); str = str.replace( /-$/, ''); return str; } I use it "onkeypress" for administrate articles: typing the title shows in real time how looks the shortcut.

Trackback from Six Apart Professional Network
September 10, 2004 3:26 PM

Dirify in PHP

Excerpt: This one's a handy reference: Dirify in PHP, courtesy of Adam Kalsey. If you've ever used the "dirify" attribute in a Movable Type template tag, this function performs the same text transformation, but in PHP. It's somewhat underreported that in...

November 2, 2004 3:05 AM

I found the convert_high_ascii() function exceedingly useful for stripping out evyl characters for use with a new flash/xml solution I'm working on. Many thanks! (And yes, full credits in the source :)

November 24, 2004 4:21 AM

Excellent - stripped out x92 (funny apostrophe?) from some Excel generated data for use in xml parser that barfs at anything odd! Thanks

July 17, 2009 4:09 AM

This is exactly what I was looking for. Thanks so much!

July 30, 2009 5:23 PM

Just what I've been looking for! Thank you!!!

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