Here's my script where the problem occures.
You can see that there is a SQL statement error in $lvRequete because there a problem when an Oracle Error occures.
The first execution goes well, but since the second execution i've go the waiting cursor on my web page and the PHP module still running.

<?php
function MySQLStatement() 
{
	global $conn_id;

	$conn_id = OCILogon("myname", "mypass", "ORACLE");

	if ($conn_id == false)
	{
		echo 'OWS-20004 : Oracle error. Unable to connect to destination !';
		exit;
	}
	$lvRequete = "*Select sysdate from dual";
	if ($SQLStatement = OCIParse($conn_id,$lvRequete))
	{
		if (OCIExecute($SQLStatement)==0)
		{
			OCILogOff($conn_id); 
			echo 'OWS-20005 : Oracle error. SQL Syntax error !';
			exit;
		}
		
	}
	else
	{
		echo 'OWS-20006 : Oracle error. Parse SQL error Level 0 !';
		exit;
	}
	if(OCIFetch($SQLStatement) != 0)
	{	
		$lvColumnName = OCIResult($SQLStatement,1);
		
		return $lvColumnName;
	}
	else
	{
		OCILogOff($conn_id);
		return "Fetch Error";
	}
	OCIFreeStatement($SQLStatement);
}

$MyValue = MySQLStatement();
echo $MyValue;
?>