Hey guys,i really want to get in programming. I have knowledge in PHP and MYSQL. But am confused about somethings,don't know if you can describe the following for me,their purpose,how they interact with each other!!

1.JSON
2.LIBRARIES
3.API
4.How mobile apps interact with database.

Thanks

Later please, I am in a bus

Google is your friend

sellyjeffery:
Hey guys,i really want to get in programming. I have knowledge in PHP and MYSQL. But am confused about somethings,don't know if you can describe the following for me,their purpose,how they interact with each other!!

1.JSON
2.LIBRARIES
3.API
4.How mobile apps interact with database.

Thanks

JSON is referred to as Javascript Object Notation, its the current industrial standard for exchanging data between devices over a network.
it encompasses of a pair of" key: day" structure

the data is lightweight and faster that its rival XML,

key : data

example
name : Williams,

of I wish to reference the data above, I only need to create a var thwt stores tge object like

var username = Json object returned from server (ie name: Williams)

to reference it, I need

username.name

this returns the data Williams

2.
Libraries

this are predefined sets of functions, classes etc that perform a specific ramge of things,.it makes programming easier and your program easier to maintain, all you jeed to do is to import them to your program,
unlike classes, libraries usually consists of groups of classes, predefined parameters, etc which can be directly referenced by your program
example Math in java helps in rounding numbers, calculating powers etc


4. How do mobile apps interect with databases?

very brilliant question, I skipped the API part to explain this first,

The answer is simple "over the Internet"
mobile APPS use what we call Http calls to request and send data over a network, that's why Json and XML comes handy, tje industrial standard is using a URL created explicitly for data exchange or sending data by the mobile device.

to read futher, check out Restful APIs, especially using Json.
usually these URL links are created by a server scripting language such as PHP and hosted on the server, after which theu are consumed by the mobile deviCE over the internet using http calls...

Am trying to get a hang of these JSON. You said JSON is used in the transfer of data between 2 devices over a network..is the network a webserver ?..and an app like whatsapp that messages are sent between 2 devices,does it mean that it uses the principle of JSON to transmit the data

sellyjeffery:
Am trying to get a hang of these JSON. You said JSON is used in the transfer of data between 2 devices over a network..is the network a webserver ?..and an app like whatsapp that messages are sent between 2 devices,does it mean that it uses the principle of JSON to transmit the data

by network, I am referring to devices that can communicate together, INTERNET makes that possible for device A to request for resources from device B, and vice versa,


Nairaland for example requires all its HTML,CSS, etc to be on the web server, but for you to have access to Nairaland from your end, you need INTERNET,


Secondly, Whatsapp most likely use Json to exchange data between devices,

if two devices wish to communicate, the following might happen

A sends to Server (this is where the database reside),

Server receives data from A, stores it on the database and allocate B as the receiver,

B is trying to view its unread messages from the database, and thus runs a query on to database to fetch unread messages, you guessed right, Http Request calls is made by device B to the server, using Json to send data

sellyjeffery:
Hey guys,i really want to get in programming. I have knowledge in PHP and MYSQL. But am confused about somethings,don't know if you can describe the following for me,their purpose,how they interact with each other!!

1.JSON
2.LIBRARIES
3.API
4.How mobile apps interact with database.

Thanks

Try w3schools.com you will get them explained there.