Apparent Memory leak in External Stored Procedure with INOUT param w/ PHP's IBM DB2 extension 1.9.9 when binding the parameter in PHP7. When the bindparam on the out parameter is done outside of the loop memory doesn't increase.

create stored external proc.sql

CREATE OR REPLACE PROCEDURE MYLIB.TESTSP (
	IN "ID" DECIMAL(7, 0) ,
	INOUT CUSTOMERNAME CHAR(40) )
	LANGUAGE RPGLE
	SPECIFIC MYLIB.TESTSP
	NOT DETERMINISTIC
	NO SQL
	CALLED ON NULL INPUT
	EXTERNAL NAME 'MYLIB/MYTESTRPG'
	PARAMETER STYLE GENERAL ;

Proof.php

<?php
$db2Connection = db2_connect('MYDB', 'MYUSER', 'MYPASS',array('i5_lib' => 'MYLIB'));
$sql = "CALL MYLIB.TESTSP(?,?)";
$stmt = db2_prepare($db2Connection, $sql);
for ($i = 0; $i <= 20; $i++) 
{
    if ($stmt) 
    {
        $id = 20;
        $name = "";
        db2_bind_param($stmt, 1, "id", DB2_PARAM_IN);
        db2_bind_param($stmt, 2, "name", DB2_PARAM_OUT);
        if (db2_execute($stmt)) 
        {
            var_dump($name);
            echo "<br>";
            echo "Memory usage: ";
            var_dump(memory_get_usage());//Memory usage increases 64 Bytes per call, in old DB2 Memory stays constant.
            echo "<br>";
        }
    }
    else 
    {
        echo "<b>Last SQL Statement Error Message:</b> ".db2_stmt_errormsg()."<br>";
    }
    if($db2Connection===FALSE)
    {
        echo "<b>Last Connection Error Message:</b> ".db2_conn_errormsg()."<br>";
    }
}
exit();

if php variable $name is outside of the loop
$name = "";
memory doesn't increase