Description:
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Executing the sample script on Windows 7 with php 7.0.4 (sorry, I cannot try a newer version), produces a ZIP file that cannot be deleted by the same script. 

The unlink() reports a "Permission denied" error message. 

If I uncomment the line of the unlinkArchive() then I get "PHP Fatal error:  Uncaught PharException: phar archive "x.zip" has open file handles or objects.  fclose() all file handles, and unset() all objects prior to calling unlinkArchive() in ....php:8"

I cannot unlink the tgz either, the messages are the same. 

When the script finishes then the file can be deleted after that.

The same script on an old Linux with php 5.5.16 works well, the zip file can be deleted without any issue. 

Test script:
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<?php
	$tgzName = 'x.tgz';
	$zipName = 'x.zip';
	
	$phar    = new PharData($tgzName);
	$zip     = $phar->convertToData(Phar::ZIP);
	
	// PharData::unlinkArchive($tgzName);  // this also fails
	unlink($zipName);    // this fails.

Expected result:
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The created *.zip file should be able to be deleted. 

Actual result:
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"Permission denied" if only the unlink() is called.

PharException is thrown if unlinkArchive() is called before invoking unlink().