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For many types, this function makes an attempt to return a string that would yield an object with the same value when passed to eval().

The Model: This consists of various representations of the data your application knows about.
The View: This is made up of several representations of the data that will be displayed to your users.
The Controller: This is the part of the application that will handle user interactions. It's a bridge between the model and the view.

The idea behind MVC is to decouple the View from the Model. The model must be self-contained and ignorant of the UI.

Its role is to control actions available to the end user, as well as routing through the different views of the application.

really like Bitcoin. I own Bitcoins. It's a store of value, a distributed ledger. It's a great place to put assets, especially in places like Argentina with 40 percent inflation, where $1 today is worth 60 cents in a year, and a government's currency does not hold value. It's also a good investment vehicle if you have an appetite for risk. But it won't be a currency until volatility slows down."

Private keys are generated from large amounts of random data, called entropy

to become your own bank

private key is a large random number that acts as the key to spend your bitcoins.

While /var/log/httpd/ is the default location for Apache logs, this location can be changed with Apache's configuration files.

/var/log/messages

By default, this log file contains all syslog messages (except e-mail) of INFO or higher priority.