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# mysql_errno

(PHP 3, PHP 4 )

mysql_errno -- Returns the numerical value of the error message from previous MySQL operation

## Description

int mysql_errno ( [resource link_identifier])

Returns the error number from the last MySQL function, or `0` (zero) if no error occurred.

Errors coming back from the MySQL database backend no longer issue warnings. Instead, use mysql_errno() to retrieve the error code. Note that this function only returns the error code from the most recently executed MySQL function (not including mysql_error() and mysql_errno()), so if you want to use it, make sure you check the value before calling another MySQL function.

Example 1. mysql_errno Example
    <?php
        mysql_connect("localhost", "mysql_user", "mysql_password");

        mysql_select_db("nonexistentdb");
        echo mysql_errno() . ": " . mysql_error(). "\n";

        mysql_select_db("kossu");
        mysql_query("SELECT * FROM nonexistenttable");
        echo mysql_errno() . ": " . mysql_error() . "\n";
    ?>
The above example would produce the following output:
    1049: Unknown database 'nonexistentdb'
    1146: Table 'kossu.nonexistenttable' doesn't exist

> Note: If the optional argument is specified the given link is used to retrieve the error code. If not, the last opened link is used.

See also: mysql_error()

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