Preview:
<?php

    $nome = $_POST["nome"];
    $email = $_POST["email"];
    $tel = $_POST["tel"];
    $id = $_POST["id"];

    include_once 'conexao.php';

    $sql = "update cliente set
            nome = '".$nome."', email = '".$email."',telefone = '".$tel."'
            where idcliente = ".$id;

    if(mysql_query($sql,$con)){
        $msg = "Atualizado com sucesso!";
    }else{
        $msg = "Erro ao atualizar!";
    }
    mysql_close($con);

    ?>
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