* Use isset() to test if a variable has a value.
* variable names are case sensitive; functions are not.
* The foreach loop is powerful for iterating over arrays.
* Control your extensions in php.ini and don't have more than you really need.

Go to 3rd slide

* Central to the .net framework is its runtime execution environment, known as CLR.
* .Net compiles to IL.
* CTS define the predefined data types that are available in IL.
* Vb.net - Integer and C# - int both refers to Int32 due to CTS .

Java is case sensitive.
* All method names begin with a lowercase letter.
* All field names begin with a lowercase letter. Underscores can also be used.
* Constants are in uppercase letters and can also use underscores.