CASSIS: Scooping

gistfile1.js

// Javascript needs you to declare variables inside functions or they will be created in the global scoop.
$var1 = 'global';
function change() {
	if (js()) eval('var $var1;');
	$var1 = 'scooped';
}
change();

// PHP needs you to declare variables inside functions if you want them to be in the gobal scoop.
$var2 = 'global';
function change2() {
	if (!js()) eval('global $var2;');
	$var2 = 'scooped';
}
change2();

To think about when writing CASSIS code:

Keep within a function.

Without line 4 $var1 will equal global in PHP and scooped in Javascript. When line 4 is included $var1 equals global in both cases. The value from inside the function no longer leaks into the global scoop.

Accessing global scoop.

Without line 12 $var2 will equal global in PHP and scooped in Javascript. When line 12 is included $var2 equals scooped in both cases. The value from inside the function correctly overwrites the global scoop.