You can write your own functions in addition to the ones that PHP comes with.

A block of statements called a function can be utilized repeatedly throughout a program.
A function won't start running immediately after a page load.
A call to a function will cause it to be used.

University of Michigan - Ann Arbor

A method is a function with class instance-specific bounds. In our example above, $car is an instance of the class WheeledVehicle, and the values we have assigned can be accessed within the methods it defines. This implies it can access the property values associated with the instance of the class.

PHP Methods

Over 1000 built-in functions in PHP can be invoked directly from scripts to carry out particular tasks.

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