remove accented chars - all htmlentities charsets / encoding.

strip.php

<?php

$specialchars =
	array(
	  "\t" => '_',
	  "\r" => '_',
	  "\n" => '_',
		' '  => '_',
		':'  => '.',
		'`'  => ''
	)
	+ get_html_translation_table( HTML_ENTITIES, ENT_QUOTES, 'UTF-8' )
	+ get_html_translation_table( HTML_ENTITIES, ENT_QUOTES, 'ISO-8859-1' )
	+ get_html_translation_table( HTML_ENTITIES, ENT_QUOTES, 'ISO-8859-15' )
	+ get_html_translation_table( HTML_ENTITIES, ENT_QUOTES, 'ISO-8859-5' )
	+ get_html_translation_table( HTML_ENTITIES, ENT_QUOTES, 'cp1251' )
	+ get_html_translation_table( HTML_ENTITIES, ENT_QUOTES, 'cp1252' );

foreach ( $specialchars as $char => $entity ) {
	if ( strpos( $entity, '#' ) ) {
		$specialchars[ $char ] = '-';
	} elseif ( preg_match( '@^&([a-zA-z]{1,2})(grave|acute|circ|tilde|uml|cedil|lig|slash);$@', $entity, $matches ) ) {
		$specialchars[ $char ] = $matches[1];
	} elseif ( preg_match( '@^&(.*);$@', $entity, $matches ) ) {
		$specialchars[ $char ] = $matches[1];
	} else {
		$specialchars[ $char ] = '-';
	}
}
$string = strtr( "blaÄAÜÏO `ìq.txt", $specialchars );