Create slugs with accented chars in PHP and Javascript

makeslug.js

/*
 *  Javascript makeslug()
 *    by J. Santos <jefrey[at]jefrey[dot]ml>
 */
 
/*
  Usage:
    string makeslug( string val [, string replaceBy = "-" ] )

  Example:
    makeslug("   This is a string fuLL of áccêntèd and InVaLid (?) cHaRs!!!   ");
  Will return:
    this-is-a-string-full-of-accented-and-invalid-chars
  
  And:
    makeslug("   This is a string fuLL of áccêntèd and InVaLid (?) cHaRs!!!   ", "_");
  Will return:
    this_is_a_string_full_of_accented_and_invalid_chars
*/


function makeslug(val, replaceBy) {
  replaceBy = replaceBy || '-';
  var mapaAcentosHex 	= { // by @marioluan and @lelotnk
  	a : /[\xE0-\xE6]/g,
  	A : /[\xC0-\xC6]/g,
  	e : /[\xE8-\xEB]/g, // if you're gonna echo this
  	E : /[\xC8-\xCB]/g, // JS code through PHP, do
  	i : /[\xEC-\xEF]/g, // not forget to escape these
  	I : /[\xCC-\xCF]/g, // backslashes (\), by repeating
  	o : /[\xF2-\xF6]/g, // them (\\)
  	O : /[\xD2-\xD6]/g,
  	u : /[\xF9-\xFC]/g,
  	U : /[\xD9-\xDC]/g,
  	c : /\xE7/g,
  	C : /\xC7/g,
  	n : /\xF1/g,
  	N : /\xD1/g,
  };
  
  for ( var letra in mapaAcentosHex ) {
  	var expressaoRegular = mapaAcentosHex[letra];
  	val = val.replace( expressaoRegular, letra );
  }
  
  val = val.toLowerCase();
  val = val.replace(/[^a-z0-9\-]/g, " ");
  
  val = val.replace(/ {2,}/g, " ");
    
  val = val.trim();    
  val = val.replace(/\s/g, replaceBy);
  
  return val;
}

makeslug.php

<?php
/*
 *  PHP makeslug()
 *    by J. Santos <jefrey[at]jefrey[dot]ml>
 */

/*
  Usage:
    string makeslug( string val [, string replaceBy = "-" ] )

  Example:
    makeslug("   This is a string fuLL of áccêntèd and InVaLid (?) cHaRs!!!   ");
  Will return:
    this-is-a-string-full-of-accented-and-invalid-chars

  And:
    makeslug("   This is a string fuLL of áccêntèd and InVaLid (?) cHaRs!!!   ", "_");
  Will return:
    this_is_a_string_full_of_accented_and_invalid_chars
*/

function makeslug($val, $replaceBy = '-') {
    
  if(mb_detect_encoding($val.'x', 'UTF-8, ISO-8859-1') == 'UTF-8')
    $val = utf8_decode(strtolower($val));

  $mapaAcentosHex    = Array( // by @marioluan and @lelotnk
    'a' => '/[\\xE0-\\xE6]/',
    'A' => '/[\\xC0-\\xC6]/',
    'e' => '/[\\xE8-\\xEB]/',
    'E' => '/[\\xC8-\\xCB]/',
    'i' => '/[\\xEC-\\xEF]/',
    'I' => '/[\\xCC-\\xCF]/',
    'o' => '/[\\xF2-\\xF6]/',
    'O' => '/[\\xD2-\\xD6]/',
    'u' => '/[\\xF9-\\xFC]/',
    'U' => '/[\\xD9-\\xDC]/',
    'c' => '/\\xE7/',
    'C' => '/\\xC7/',
    'n' => '/\\xF1/',
    'N' => '/\\xD1/'
  );

  foreach($mapaAcentosHex as $letra => $expressaoRegular) {
    $val = preg_replace( $expressaoRegular, $letra, $val );
  }

  $val = strtolower($val);
  $val = preg_replace('/[^a-z0-9\-]/', " ", $val);

  $val = preg_replace("/ {2,}/", " ", $val);

  $val = trim($val);
  $val = str_replace(" ", $replaceBy, $val);

  return $val;
}

nice!