Description:
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Using mysql_query and typing "exit" after the call is resulting in duplicate queries. If you take "exit" off the end of the code, the query will be executed only once as it should. 

$host = "localhost";
$user = "root";
$password = "password";
$databasename = "databasename";
$connection=mysql_connect ($host, $user, $password) or die ('I cannot  connect to the database because: ' . mysql_error()); 
mysql_select_db($databasename);	
	
$sql = "INSERT INTO table(field, field2, field3) VALUES('value1', 'value2', 'value3')";
$result = mysql_query($sql,$connection) or die ('Database error: ' . mysql_error());	
exit; // take this off and the call is executed once

Test script:
---------------
$host = "localhost";
$user = "root";
$password = "password";
$databasename = "databasename";
$connection=mysql_connect ($host, $user, $password) or die ('I cannot  connect to the database because: ' . mysql_error()); 
mysql_select_db($databasename);	
	
$sql = "INSERT INTO table(field, field2, field3) VALUES('value1', 'value2', 'value3')";
$result = mysql_query($sql,$connection) or die ('Database error: ' . mysql_error());	
exit; // take this off and the call is executed once