int 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.
<?php
mysql_connect("marliesle");
echo mysql_errno().": ".mysql_error()."<BR>";
mysql_select_db("nonexistentdb");
echo mysql_errno().": ".mysql_error()."<BR>";
$conn = mysql_query("SELECT * FROM nonexistenttable");
echo mysql_errno().": ".mysql_error()."<BR>";
?>See also: mysql_error()