Your contribution cannot be approved because it is not as informative as other contributions. See the Utopian Rules.

Contributions need to be informative and descriptive in order to help readers and developers understand them.

End-user focused tutorials must address a minimum of three substantial concepts that are unique to the Open Source project and essential learning requirements for end-users.

Just using the substr() function isn't complex enough to write a tutorial about. In the future I would recommend finding something to write about that isn't as straightforward.

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