Your contribution cannot be approved because it does not follow the Utopian Rules.

Hi, this is the reason your contribution was rejected

• Tutorials must be technical instructions that teach non-trivial aspects of an open-source project.

All the information in your tutorial can already be found in PHP's documentation, e.g. for the sin() function or the getrandmax(); it doesn't provide any unique value. For tutorial tutorials I recommend you don't create a tutorial where you simply explain what certain functions do (especially when it's already explained in the official documentation), as that isn't considered a valid contribution to Utopian.io and thus won't be accepted.

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