global declaration

[lucerias]

May i know when to use global, when to use var? If let say i require x.php file into y.php file by using require syntax, and want to use the variable in the x.php file, do i have to declare again in y.php file or i can directly make use of it and then value can be passed from x.php to y.php? Thank you

[btherl]

You don't need global when including files.

You need global when you want to access a variable from inside a function.  Eg

[code=php:0]$var = 5;

function foo() {
  global $var;
  print "var = $var\n";
}[/code]

[lucerias]

If i use require or include method to include x.php into y.php, and then i include y.php into z.php, can i make use of the parameter stored in x.php with z.php? Thank you.

[btherl]

Yes you can.  Try it and see for yourself :)