© Frank M. Kromann 2018
Frank M. KromannBeginning PHP and MySQLhttps://doi.org/10.1007/978-1-4302-6044-8_4

4. Functions

Frank M. Kromann1 
Aliso Viejo, CA, USA

Computer programming exists in order to automate tasks either too difficult or tedious for humans, from mortgage payment calculation to calculating the trajectory of a football launched by a virtual player in a video game You’ll often find that such tasks are comprised of bits of logic that can be reused elsewhere, not only within the same application but also in many other applications. For example, an e-commerce application might need to validate an e-mail address on several different pages, such as when a new user registers to use a website, when somebody wants to add a product review, ...

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