# mysql_errno

(PHP 4, PHP 5, PECL mysql:1.0)

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.

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.

### Parameters

`link_identifier`

  The MySQL connection. If the link identifier is not specified, the last link opened by mysql_connect() is assumed. If no such link is found, it will try to create one as if mysql_connect() was called with no arguments. If by chance no connection is found or established, an `E_WARNING` level warning is generated.

### Return Values

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

### Examples

Example#1 mysql_errno() example

`<?php
$link = mysql_connect("localhost", "mysql_user", "mysql_password");
if (!mysql_select_db("nonexistentdb", $link)) {
echo mysql_errno($link) . ": " . mysql_error($link). "\n";
}
mysql_select_db("kossu", $link);
if (!mysql_query("SELECT * FROM nonexistenttable", $link)) {
echo mysql_errno($link) . ": " . mysql_error($link) . "\n";
}
?>`

The above example will output something similar to:

    1049: Unknown database 'nonexistentdb'
    1146: Table 'kossu.nonexistenttable' doesn't exist

### See Also

- mysql_error()
- » MySQL error codes