How to Escape Strings and Handle Errors in SQL Server Queries Using PHP?

Escaping Strings in SQL Server Using PHP: Alternatives to mysql_real_escape_string()

While PHP's mysql_real_escape_string() is widely used for escaping strings intended for MySQL database queries, it is not suitable for Microsoft SQL Server. This article explores alternatives for both string escaping and error retrieval in SQL Server using PHP.

String Escaping

Instead of addslashes(), which is not fully adequate, the hex byte string encoding method provides a more comprehensive solution:

$unpacked = unpack('H*hex', $data);
mssql_query('
    INSERT INTO sometable (somecolumn)
    VALUES (0x' . $unpacked['hex'] . ')
');

A more abstract implementation:

function mssql_escape($data) {
    if(is_numeric($data))
        return $data;
    $unpacked = unpack('H*hex', $data);
    return '0x' . $unpacked['hex'];
}

mssql_query('
    INSERT INTO sometable (somecolumn)
    VALUES (' . mssql_escape($somevalue) . ')
');

Error Retrieval

The mssql_get_last_message() function serves as the equivalent of mysql_error() in the context of SQL Server, providing detailed information about any encountered errors.

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