What is PHP$?$

What are the advantages of using PHP$?$

What is the difference between single quotes $(\text{'}\text{'})$ and double quotes $("")$ in PHP$?$

Explain the difference between $==$ and $===$ in PHP$.$

What is the purpose of the "echo" statement in PHP$?$

What is the use of the "include" and "require" statements in PHP$?$

What is the difference between "include" and "require" in PHP$?$

What is the difference between "include$\_$once" and "include" in PHP$?$

What are PHP superglobal variables? Name a few examples.

What is the purpose of the $"$$$\_$SESSION" superglobal variable?