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<?php

$string = utf8_decode('Acentuação de casos     grandes    ');
$str = strtolower($string);
$str = trim($str);
$str = htmlentities($str);
$str = preg_replace('@\&(\w)[^;]+;@', '\1', $str);
$str = preg_replace('@\s+@', '-', $str);

print $str;