Description:
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From manual page: https://php.net/phar.using.intro
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$p->buildFromIterator(new RecursiveIteratorIterator(new DirectoryIterator('/path/to/project')), '/path/to/');
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This needs to be replaced with

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$p->buildFromIterator(new RecursiveIteratorIterator(new RecursiveDirectoryIterator('/path/to/project')), '/path/to/');
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Otherwise it'll give a pretty fatal error.

> Uncaught InvalidArgumentException: An instance of RecursiveIterator or IteratorAggregate creating it is required