Library list mixup

test.php

<?php
// Simulate connections to production applications
$db = connectToProduction('ADAM','MYPASS');
$db = connectToProduction('AS400','MYPASS');
$db = connectToProduction('CHIP','MYPASS');
$db = connectToProduction('WEBUSER','WEBUSER');

$i = 0;
while($i <= 5) {

    // Simulate connection to development application
    $db = connectToDevelopment();

    $sql = "SELECT ENV FROM LIBTEST";
    $stmt = db2_prepare($db, $sql);
    $result = db2_execute($stmt);
    $row = db2_fetch_assoc($stmt);

    echo $row['ENV']."<br>";

    $i++;
}

function connectToProduction($username, $password)
{
    $db = db2_pconnect('*LOCAL', $username, $password,
        [
            'i5_naming' => DB2_I5_NAMING_ON,
            'i5_libl' => 'QS36F',
            'i5_lib' => 'QS36F'
        ]
    );
    if (!$db){
        throw new Exception('Connection failed');
    }
    echo "Production DB connection successful<br>";
    return $db;
}

function connectToDevelopment()
{
    $db = db2_pconnect('*LOCAL', 'WEBTEST', 'WEBTEST',
        [
            'i5_naming' => DB2_I5_NAMING_ON,
            'i5_libl' => 'SCRAPTEST',
            'i5_lib' => 'SCRAPTEST'
        ]
    );
    if (!$db){
        throw new Exception('Connection failed');
    }
    echo "Development DB connection successful<br>";
    return $db;
}