Description:
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Extract from mysql_error() php doc page:

"Note that this function only returns the error text from the most recently executed MySQL function (not including mysql_error() and mysql_errno())..."

I noticed that a error is not reset for mysql_fetch_*() call (server/client 5.0.22), mean if you perform mysql_query() for some data manipulation statement producing a error, then call mysql_fetch_*(), mysql_error() will return mysql_query() error message.

So the docs page is inconsistent with current mysql lib behaviour

Reproduce code:
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mysql_connect('localhost', 'mirya', 'my-passwd');
mysql_select_db('test');
mysql_query('CREATE TABLE a (a INT AUTO_INCREMENT PRIMARY KEY) ENGINE = InnoDB');
mysql_query('CREATE TABLE b (b INT AUTO_INCREMENT PRIMARY KEY, a INT NOT NULL, FOREIGN KEY (a) REFERENCES a(a) ON DELETE REST
mysql_query('INSERT a VALUES (1), (2), (3)');
$rs = mysql_query('SELECT a FROM a');
while ($row = mysql_fetch_assoc($rs)) {
        if (mysql_error()) die('Shouldn\'t happen: '.mysql_error());
        mysql_query('INSERT b (a) VALUES (4)');
        if (mysql_error()) echo "Foreign key constraint fails\n";
}
echo "Finished w/o errors\n";

Expected result:
----------------
Foreign key constraint fails
Finished w/o errors

Actual result:
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Foreign key constraint fails
Shouldn't happen: Cannot add or update a child row: a foreign key constraint fails (`test/b`, CONSTRAINT `b_ibfk_1` FOREIGN KEY (`a`) REFERENCES `a` (`a`))