I choosed Php to develop websites.I never been a big fan, coming from Perl, but considering alternatives it does the job when you have your own functions and classes. I use php as a template language. Pros:

• It’s populare
• It’s mature
• Easy to find some developers
• It’s a good couple with Apache

Cons:

• No real hash
• It’s not Perl !

The table below is an easy reference for what these functions will return for different values. The blank spaces means the function returns bool(false).

Value of variable ($var)	isset($var)	empty($var)	is_null($var)
“” (an empty string)	bool(true)	bool(true)
” ” (space)	bool(true)
FALSE	bool(true)	bool(true)
TRUE	bool(true)
array() (an empty array)	bool(true)	bool(true)
NULL		bool(true)	bool(true)
“0” (0 as a string)	bool(true)	bool(true)
0 (0 as an integer)	bool(true)	bool(true)
0.0 (0 as a float)	bool(true)	bool(true)
var $var; (a variable declared, but without a value)		bool(true)	bool(true)
NULL byte (“\ 0?)	bool(true)