php – Add Array coming from multiple fields

Question:

I have a form with several fields containing currency values ​​how can I add all these values ​​in the post output

Example form

<form id="form2" name="form2" action="includes/acao.php?form=faturamento"   
method="post" >
<input type='hidden' name='valor[{$id_finan}]'  value='{960.00}' />
<input type='hidden' name='valor[{$id_finan}]'  value='{960.00}' />
<input type='hidden' name='valor[{$id_finan}]'  value='{960.00}' />
</form

action.php

foreach($_POST["checkbox"] as $key=>$value){    
echo $valor = mysql_real_escape_string($_POST['valor'][$key]);
// Retorno 960.00960.00960.00
}

How to bring this added return

Answer:

# SIMULACAO
$post = array(
    'valor' => array(
        0 => 10,
        1 => 10,
        3 => 10,
        4 => 10,
        5 => 10,
        6 => 10,
        7 => 10,
    )
);

# RESOLUCAO
echo array_sum($post['valor']); // 70