Search:

or this
$search = str_replace('%', '[aàáâãäå]', $search);
$search = str_replace('%', '[eèéêë]', $search);
$search = str_replace('%', '[iìíîï]', $search);
$search =...

try this

$search = str_replace('%', '[ÑñÇçÀÁÂÃÄÅÈÉÊËÌÍÎÏÒÓÔÕÖÙÚÛÜàáâãäåèéêëìíîïòóôõöùúûü]', $search);