PHP function 'scandir' shows deleted directory when deleted directory was open in Windows Explorer

I am running Apache HTTP server 2.4 on a Windows Server 2008 R2 machine with PHP 5.4.4.

I have the following directory structure on myE:\ drive:

E:\Dir1\Dir2\Dir3
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All of the directories (Dir1,Dir2 andDir3) are empty (they have no files) except for the child directories shown above.

I am trying to deleteDir3 and then look at the contents of directoryDir2 to make sure that there's nothing there. I have written the following PHP script to test this:

<?php

    $currentDir = "E:\\Dir1\\Dir2\\Dir3";

    $parentDir = dirname( $currentDir );  // Get the parent directory for Dir3.
        
    rmdir ( $currentDir );  // Remove directory Dir3.
    
    echo "<b>Current directory:</b> " . $currentDir . " <b><< I don't exist, I was just deleted.</b><br />";
    echo "<b>Parent directory:</b> " . $parentDir. "<br />";
                
    echo "<b>According to 'scandir', the parent directory contains:</b> ";
    print_r( scandir( $parentDir, SCANDIR_SORT_NONE ) );
    echo "<br /><br />";

?>
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If I do not haveDir3 open in Windows Explorer, the script above woks perfectly and delivers the following output:

Current directory: E:\Dir1\Dir2\Dir3 << I don't exist, I was just deleted.

Parent directory: E:\Dir1\Dir2

According to 'scandir', the parent directory contains: Array ( [0] => . [1] => .. )

However, if I haveDir3 open in Windows Explorer, I get the following output:

Current directory: E:\Dir1\Dir2\Dir3 << I don't exist, I was just deleted.

Parent directory: E:\Dir1\Dir2

According to 'scandir', the parent directory contents: Array ( [0] => . [1] => .. [2] => Dir3 )

Notice thatDir3 appears in the array of contents forDir2. In other words,scandir() thinks thatDir3 still exists even when I know for a fact that it doesn't (Windows explorer kicks me back toDir2).

Does anyone know why this is happening?