Variable undefined, how can I solve?

Question

I have the following code:

<?php
    
    $perfilUser = $pdo->prepare("SELECT * FROM `perfil_user`");
    $perfilUser->execute();
    $perfilUser = $perfilUser->fetchAll();

    if(isset($_POST['usuario_texto'])){
        $pf_foto = $_POST['pf_foto'];
        $pf_nome = $_POST['pf_nome'];
        $pf_cargo = $_POST['pf_cargo'];
        $pdo->exec("DELETE FROM `perfil_user`");
        $sql = $pdo->prepare("INSERT INTO `perfil_user` VALUES (null,?,?,?)");
        $sql->execute(array($pf_foto,$pf_nome,$pf_cargo));
    }
    
?>

<form method="POST">
    <input type="text" name="pf_foto" value="<?php echo $pf_foto; ?>" placeholder="Foto do perfil">
    <input type="text" name="pf_nome" value="<?php echo $pf_nome; ?>" placeholder="Nome">
    <input type="text" name="pf_cargo" value="<?php echo $pf_cargo; ?>" placeholder="Cargo">

    <input type="hidden" name="usuario_texto">
    <input type="submit" name="acao" value="Salvar">
</form>

What I’m doing is getting the information from the table profile_user is pf_photo, pf_name and pf_cargo and editing this with the form and showing the information on the input.

But, appears this warning on the inputs line where I am calling the information with value="<?php echo $pf_foto; ?>", value="<?php echo $pf_nome; ?>" and value="<?php echo $pf_cargo; ?>" of the table and returns the following warning:

Undefined variable $pf_foto
Undefined variable $pf_nome
Undefined variable $pf_cargo

I don’t understand what is happening, for me the code is right. Can you help me in this please?