<?php
 
$array = Array(
 (0) => Array
    (
        forn_nome_fantasia =>   'FORNECEDOR TESTE',
        class_nvl4_descricao =>   'DESPESAS COM FRETES',
    )
,
 (1) => Array
    (
        forn_nome_fantasia => 'DJ/ DESEO -SALA DE ESTAR',
        class_nvl4_descricao =>   'FRETES',
 
    )
,
 (2) => Array
    (
        forn_nome_fantasia => 'DJ/ DESEO -SALA DE ESTAR',
        class_nvl4_descricao =>   'DESPESAS COM FRETES',
 
    )
,
 (3) => Array
    (
        forn_nome_fantasia => 'DJ/ DESEO -SALA DE ESTAR',
        class_nvl4_descricao =>   'DESPESAS COM FRETES',
 
    )
);
 
foreach($array as $idx => $texto){
   for($x=$idx+1;$x<sizeof($array);$x++){
      if( $array[$idx]['class_nvl4_descricao'] == $array[$x]['class_nvl4_descricao'] ){
         $array[$x]['class_nvl4_descricao'] = 'removido';
      }
   }
}
 
echo $array[0]['class_nvl4_descricao'].'<br>';
echo $array[1]['class_nvl4_descricao'].'<br>';
echo $array[2]['class_nvl4_descricao'].'<br>';
echo $array[3]['class_nvl4_descricao'].'<br>';

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