===== Syntax =====

<code php>
int mysql_errno([resource $res])
</code>

//(PHP 4, PHP 5)//

^ $res | The database connection resource that we want to use. |
^ RETURNS | MySQL-specific error code generated by the last database query. |

===== What it Does =====

Returns the error code for the last ''MySQL'' error generated.  [[mysql_query]] function will return //false// if an error occurred.  You can check for this when running your query and use **mysql_errno** to get the error code.  If the optional parameter **$res** is left out, the function will use the last database resource opened by the script.

===== Example =====

<code php>
// open the mysql resource
$res = mysql_connect($server, $user, $pass);

// insert a single row into tblState
if (!mysql_query('INSERT * INTO tblState (\'California\')', $res)) {
    // get the error number
    $errno = mysql_errno($res);
}
</code>