mysql_errnoPHP ManualPrevNextmysql_errnomysql_errno -- Returns the number of the error message from previous MySQL operationDescriptionint mysql_errno(int [link_identifier] ); Errors coming back from the mySQL database backend no longer issue warnings. Instead, use these functions to retrieve the error number. 1  2 <?php 3 mysql_connect("marliesle"); 4 echo mysql_errno().": ".mysql_error()."<BR>"; 5 mysql_select_db("nonexistentdb"); 6 echo mysql_errno().": ".mysql_error()."<BR>"; 7 $conn = mysql_query("SELECT * FROM nonexistenttable"); 8 echo mysql_errno().": ".mysql_error()."<BR>"; 9 ?> 10  See also: mysql_error() PrevHomeNextmysql_drop_dbUpmysql_error