Generate byte image array to insert into BD

Question

I need to save a jpg image in the database in a BLOB column, however, everything I tried didn’t work out, what I’m testing now to try to generate the byte array is this:

ini_set('memory_limit', '-1');
$filename = $file['tmp_name'];
$byteArrayFile = ""; 
$fhandle = fopen($filename, "rb");
    while (!feof($fhandle)) {
        $data = fread($fhandle, 1);
        // array_push($byteArrayFile, $data);
        $byteArrayFile .= $data;
    }
fclose($fhandle);

And to insert in the comic I’m trying something like this:

$sql = "INSERT INTO TABELA(campo_blob) VALUES('{$byteArrayFile}')";

But as I wrote at the beginning, nothing went right, someone knows the right way to save the image in the BLOB column comic ?

Thank you.