PHP mysql_error function

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mysql_error

(PHP 3, PHP 4, PHP 5)

Returns the error text from the last MySQL function.
Errors coming back from the MySQL database backend no longer
issue warnings. Instead, use mysql_error() to
retrieve the error text. Note that this function only returns the
error text 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.

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.

Returns the error text from the last MySQL function, or
” (empty string) if no error occurred.

Example 1. mysql_error() example

$link = mysql_connect("localhost", "mysql_user", "mysql_password");
 
mysql_select_db("nonexistentdb", $link);
echo mysql_errno($link) . ": " . mysql_error($link). "\n";
 
mysql_select_db("kossu", $link);
mysql_query("SELECT * FROM nonexistenttable", $link);
echo mysql_errno($link) . ": " . mysql_error($link) . "\n";

The above example will output
something similar to: