initializing variables

[cold]

for security and best practice,i would like to initialize variables in the begining of my scripts.

i know that i initialize the following like this :
$string = '';
$boolean=true/false;
$int=NULL;
$array = array();

am i correct?

another thing,to check if the variable has been initialized,do i use isset or just if($varname)
?

regards

[laserlight]

I suggest initialising variables at the beginning of their scope. For some variables it would indeed be at the beginning of the script. For others, it may be at the start of a function, a loop, etc.

another thing,to check if the variable has been initialized,do i use isset or just if($varname)

Use [man]isset[/man] or [man]empty[/man], especially for incoming variables.