If the id column is an automatic increment, you can use mysql_insert_id :
Gets the identifier generated for AUTO_INCREMENTthe previous one INSERT.
The example in the manual is as follows:
$link = mysql_connect('localhost', 'mysql_user', 'mysql_password');
if (!$link) {
die('Could not connect: ' . mysql_error());
}
mysql_select_db('mydb');
mysql_query("INSERT INTO mytable (product) values ('kossu')");
printf("Last inserted record has id %d\n", mysql_insert_id());
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