escape_str in mysql

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In the DB_driver.php, in the function compile_binds, when the char "?" is replaced by the bind, it removes the slashes "\".

I add this into my CI code:

Code:

$sql = preg_replace('#'.preg_quote($this->bind_marker, '#').'#', str_replace('\\', '\\\\',str_replace('$', '\$', $val)), $sql, 1);

line: 525

Is this ok?